Infrastructure Design Criteria - Volume C: Commuter Infrastructure - Requirements

1. Active Mobility Act (AMA)

2. LTA Standard Details of Road Elements (SDRE)

3. LTA Civil Design Criteria (CDC)

4. LTA Code of Practice on Street Works Proposals Relating to Development Works

5. LTA Code of Practice on Vehicle Parking Provision in Development Proposals

6. LTA Public Street Lighting Guidelines

7. LTA Transport Impact Assessment Guidelines for Developments 2019 Edition

8. URA Walking and Design Guide

9. BCA Universal Design Guide for Public Places

10. BCA Code on Accessibility in the Built Environment

11. Singapore Standard - SS485 – Specification for Slip Resistance Classification of Pedestrian Surface Materials

12. Singapore Standard – NA to SS EN 1994 – Singapore National Annex to Eurocode 4 : Design of Composite Steel and Concrete Structures

The M&E services works shall comply strictly with all statutory regulations, by-laws and orders currently in force and to the satisfaction of all government authorities and all statutory authorities.

Where equipment or material are specified to conform to requirements of certain standard, evidence including written certificates and full testing reports from an accepted/ recognised testing organisation stating that the proposed equipment or material have been tested and conform to the specified standard shall be submitted.

Where no standards are stated in the Authority’s Requirements, all details, materials, equipment and workmanship shall be in accordance with the relevant local and international standards.

Local codes, regulations, and standards shall take precedence. In addition to local requirements, the M&E services works shall comply with the various international standards and manuals as follows:

- British Standards (BS)

- International Electrotechnical Commission (IEC)

- International Standards Organization (ISO)

- ASHRAE – American Society of Heating, Refrigerating and Air-Conditioning Engineers

- Guidelines for Good Indoor Air Quality in Office Premises

- AMCA - Air Movement and Control Association (USA)

- ANSI - American National Standards Institute (USA)

- ARI - Air-conditioning & Refrigeration Institute

- ASTM - American Society of Testing and Materials

- VCA - Heating and Ventilation Contractors Association (UK)

- SMACNA - Sheet Metal and Air-conditioning Contractors’ National Association Inc. (USA)

- UL - Underwriters Laboratory

General

The distribution boards shall be of metal enclosed indoor, factory built type corresponding principally to the latest IEC-Recommendations No. 61439, 60529 and 60947. A minimum protection of enclosure IP 42 shall be provided. Distribution boards that are exposed to weather elements or not housed within the electrical rooms or closets shall be provided with a minimum protection of IP 54, double door and shall come with glass viewing panel. Distribution boards installed in tunnel shall be provided with a minimum protection of IP65. Distribution boards of 100A and above shall be provided with voltmeter and ammeter complete with selector switches. All distribution boards shall be provided with incoming and outgoing LED indication lights.

Each distribution board shall be provided with 20% spare breakers and spare space. The overall rating, incoming cables and upstream provision shall be such that a 20% load increase for future expansion can be accommodated without alteration to the distribution system.

The Contractor shall provide glands and LSOH shrouds of an approved type for all cables entering and terminating in enclosures. Cable entries shall be sealed by an approved means on completion of installation of all cables.

Each distribution board is to be labelled properly with reverse engraved name plate secured by stainless steel screws. The details of the labels are to be approved by the Authority before fabrication.

Panel Construction

The distribution board enclosure (panels/doors) shall be made of electrogalvanised steel sheets (minimum thickness 2 mm) and finished with epoxy powder coating (minimum 60 micron) colour to the acceptance. 2.2.1 The enclosure shall be completed with hinged doors and to be provided with standardised lockset type of “A Series cam lock with Alloy Key” and 3 sets of keys shall be provided for each distribution board. The distribution boards’ doors opening shall be coordinated on Site. All DB doors shall be provided with separate latches in addition to the door locks.

The distribution boards shall be supplied fully equipped, wired, and proofed against vermin, dust and moisture, designed for free-standing or for wall-mounting, and cable access from beneath or above. Proper warning signs indicating danger and voltage level shall be provided.

The distribution board shall be composed from standardised items, enabling easy exchange or replacement of faulty equipment.

Each distribution board shall be supplied complete with top and bottom removable fibre gland plates which shall be drilled to suit cable glands, trunking or conduit entry. The gland plates shall be made of non-ferromagnetic material or proper means shall be provided to avoid any induced current flow around the single core ac cable entering the board. Spare holes shall be provided at the top and bottom of the distribution board and fitted with stopping plugs and lock nuts.

Unless otherwise approved, access to the boards shall be from the front, the doors shall be furnished with lift off hinges to permit an opening enabling an unrestricted access to the board interior. Suitable protective shields with handle shall be provided at the internal compartment to protect against live parts or terminals. All doors and covers shall be fitted with moulded gaskets of non-ageing material.

The board interior apparatus shall be fixed mounted on back plates of reinforced steel for rigid support and covered with a front panel making the access to the live parts impossible. The circuit breakers shall be mounted such that the abovementioned front panel need not be removed in order to operate any breakers. The meters and indication lights shall be installed in the door openings and be visible without opening the door.

Fibre boards of appropriate dimensions and thickness shall be provided at the front of each distribution board to protect against all live parts. Suitable protective shields shall be provided at the back of all front panels with lamps/instruments to protect against all exposed terminals. Danger signs shall be provided on all protective shields or barriers. Each switchboard shall be labelled properly with reverse engraved nameplate secured by stainless steel screws.

The distribution boards shall be provided with tinned copper conductor busbars rated for the appropriate continuous current and short circuit current. The busbars shall be designed to withstand dynamic forces due to peak short circuit current. All busbars including droppers and termination to the circuit breakers shall be provided with permanent heat shrink sleeve colour bands and alphanumeric markers.

Tinned copper busbar shall be used for connection between circuit breakers to the main busbars. The size of copper busbars shall be sized according to circuit breakers’ ampere frame (AF).

Each distribution board shall also be furnished with neutral and earthing busbars having the same rating as the phase buses.

Each distribution board shall be fitted with a multi-terminal earth bar and neutral bar with one terminal for each outgoing circuit. Connection to this earth bar shall be direct without dependence on exposed conductive parts of the enclosure and shall reflect the circuits served, i.e. circuit no. 1 in terminal no. 1 etc.

Each distribution board shall be fitted with an earth stud located in an accessible position on the inside of the board. All metal parts of the board except current carrying parts shall be bonded together electrically and to the earth bar.

The voltage/current measuring equipment, control gear, signalling lamps, small switches, fuses, contactors, terminal blocks, etc. shall be provided and properly arranged to complete the equipment for a satisfactory operation of the whole supply system.

Suitable labels in accordance with manufacturing drawings shall be placed on or under corresponding apparatus or terminal block. Proper labelling of cables shall be provided inside distribution panels. All major components shall be provided with label plate indicating the name of manufacturer, date and country of origin, serial number and main technical data of the item. The text shall be written in English on material resistant to the site conditions.

The construction of the distribution boards shall be such that no cable is subjected to bend of internal radius less than four times the overall diameter of the cable.

As-built single line diagram, control circuit and layout plan shall be inserted in a permanent pocket on the inner side of the panel door of each distribution board. All diagrams must be endorsed by LEW of the appropriate grade.

Circuit Breakers

Miniature circuit breakers shall be three phase or single phase, air-break types equipped for manual control and with automatic overcurrent trip free mechanism (bimetallic device for overload protection and electromagnetic device for short circuit instantaneous tripping). In lighting circuits with remote control an auxiliary contact shall be provided.

Miniature circuit breakers (MCBs) shall comply with the following requirement:

1. MCBs shall be manufactured and Type tested to latest IEC 60947-2 and IEC 60898-1. The mechanical and live parts except terminals and toggles shall be contained in a completely sealed casing of high mechanical strength and non-tracking phenolic materials

2. Load handling contacts shall be of anti-welding silver/tungsten tips, electrolytically deposited onto high conductivity copper backing. Operation toggle shall clearly indicate the 'ON' and 'OFF'.

3. Tripping mechanism shall be thermal magnetic fully compensated for ambient temperature and calibrated at 40°C to carry full load. MCB shall be equipped with 'trip free' mechanism.

4. Double pole or three-pole MCB must be interlocked internally so that fault on any one phase shall trip all phases simultaneously. Three pole MCB shall not be used for single phase circuits.

5. Unless otherwise specified, MCBs for general lighting and small power shall be of Type C tripping characteristic. MCBs for induction loads and motor circuits shall be of Type D tripping characteristic.

6. Short circuit duty category of MCB shall be selected to match with the anticipated maximum fault level at the installation point but shall in any case not be less than 10kA.

Moulded-case circuit breakers (MCCBs) shall comply with IEC 60947-2 with appropriate rated short-circuit breaking capacity at 400V. The short-circuit performance categories shall depend on the application of the breaker. All MCCBs shall be of four-pole, three-pole or double-pole type as required, thermal magnetic type, with magnetic adjustable for MCCB’s rated at 250A and above, independent manual operated to provide quick make, quick break, trip free mechanism so that the unit cannot be held closed against overload and short-circuit.

The making / breaking capacity of the MCCB shall be to the required prospective fault level. The utilisation category of MCCB shall be of type A for MCCB ampere frame less than or equal to 250A and type B for MCCB ampere frame greater than 250A.The rated service short-circuit breaking capacity (Ics) shall be 100% of short circuit ultimate breaking capacity (Icu).

Padlocking facilities to all MCCB’s shall be provided.

Residual current circuit breaker (RCCB) shall be provided for protection of each socket outlets circuit. RCCB shall be listed under the Product Listing Scheme. Suitable RCCB or earth leakage relay with time delay shall also be provided for protection of each zone of lighting circuits so that any tripping shall not affect the normal operation.

Earth leakage current detection shall utilise differential current transformer for activation of trip coil. Earth Leakage Relay shall have adjustable current setting up to 20A and adjustable time setting up to 1 second. A test button shall be provided for checking the relay operation.

RCCB shall comply with the following requirement:

1. The RCCB shall be of current operated type in compliance with latest SS 97.

2. A quick make and quick break switching mechanism irrespective of toggle switching speed with trip free mechanism shall be provided and the switching mechanism shall be totally enclosed within moulded backbite case.

3. The RCCB shall be four-pole for three phase circuit and double pole for single phase circuit. All RCCBs shall be internally interlocked so that in the event of earth leakage, all poles shall trip simultaneously.

4. Operating toggle shall have distinct OPEN, CLOSED and TRIPPED position. OPEN and CLOSED position shall be clearly labelled.

5. The RCCB shall be equipped with durable silver tungsten contacts and complete with auxiliary switches and alarm switches as required.

6. Test push button shall be provided to simulate earth fault condition to enable testing of tripping mechanism. A leakage indication lamp or target indicator with manual reset button for visual indication of earth leakage tripped condition shall also be provided.

Contactors

Contactors shall comply with IEC 60947-4 and of suitable rating. They shall be provided with main contacts capable of at least 105 switching operations and at least two auxiliary contacts for remote control (230V, AC). Contactors for lighting control shall be of Utilisation Category AC3 unless specified otherwise. All contactors shall be of minimum 20A rating.

Current Transformers

Current transformers shall be tape wound ring type and type-tested in compliance with latest IEC 61869. They shall withstand a continuous overload of 120%. The type, burden and accuracy class shall be suitable for its purpose.

Instruments

The indicating instruments shall be flush-mounted, measuring 96mm high and 96mm wide.

The instruments shall be of Class 1 accuracy or better.

The voltmeters shall be provided with a selector switch, for reading the values of the three phases (i.e. phase-to-phase, phase to neutral voltages).

The scales shall not be less than 90 angular degrees and the designation shall be in Amps or Volts on matt-white plate. Anti-parallax and anti-reflecting types of platforms / covers shall be used.

Surge Protection Devices (SPD)

Surge Protection Devices (SPD) shall be of either Type 1 or Type 2, DIN-rail type with standard 8/20 wave characteristics complying to IEC 61643-11.

SPD shall have a discharge rating of 40kA and protected by appropriately rated and dedicated miniature circuit breakers / fuses that have been tested to coordinate with the manufacturer’s SPDs in accordance to IEC 60364.

SPD shall be reusable type and have the choice of a light indicator or mechanical indicator for end of life.

SPD shall be designed for common mode protection.

Programmable Timers

All time switches shall run on 240V, 50Hz supply and of a 7-day, 24-hour digital programmable type, complete with minimum 24 hours internal supply reserve or battery to retain program memory and time in event of AC power failure.

Time switches shall be housed in an IP66 enclosure with transparent cover and sealing facility so as to prevent unintentional intervention and contamination of the instrument. A dedicated local overriding switch for manual switching shall be provided within the distribution board.

Timer input voltage shall be powered by AC 100- 240VAC (+10%/-15%, 50Hz).

The timer shall conform to:

1. Noise Immunity: IEC6100-4-4, 2 kV (power supply line).

2. Ambient operating temperature: 0 to 55 °C

3. Humidity: 10% - 100%

The Timer shall have the following programmable features:

1. Programmable: With input and output conditions per line

2. Basic CPU Input/ Output: Min 3 inputs and 3 outputs

All outputs should have a relay switching capacity of 5A at 230VAC with independent common.

The Timer Central Processing Unit (CPU) shall be provided with built-in real-time clock and calendar functions. The real time clock should have an accuracy of +/- 6 mins max. per year. The data of real time clock, calendar, holding bits, holding timers and counter present value shall be held by a non-battery system for a minimum of 48 hours for prolonged power interruptions.

The Timer program and system setting data shall be stored in internal EEPROM to prevent loss of setting/program during power failure.

The Timer shall have the following features and functions:

1. Front panel LCD display with backlight. Backlight can be automatically cutoff through adjustable settings to save the lifespan of backlight.

2. Input filters settings to prevent noise-related malfunctions such as false triggering of inputs.

3. Password protection function to prevent unauthorized modification of Timer programs and settings.

The Timer shall provide RS232C communication port or infrared port for downloading of program and setting.

The Timer shall support communications via RS232C to host devices such as computers and Personal Digital Assistant (PDA).

The Timer system shall be equipped with the Windows Based software programming tools and drivers for the set-up of communication between Timer and host devices.

The Timer shall be provided with application software tool running on Windows CE powered PDAs to allow setting of programs and the download/upload of the settings.

All Timer technical details and full communication protocols shall be provided.

The Timer shall have self-diagnostic functions and shall be displayed on the CPU LCD. All errors shall be communicated back to host via the RS232C communication port or infrared port.

The Contractor shall provide all software programming tools, drivers, cables and a set of host device such as computer and two PDA with software programming tools fully installed for programming and downloading to timer.

Factory test certificates shall be submitted to the Authority for verification.

Contractors shall conduct functional test of the timers at the Singapore office by sampling of 10% of each batch before deliver.

Internal Cabling

All internal cabling in each item of equipment shall be installed in cabling channels or conduits. Exposed cabling shall be kept to a minimum but where necessary the wires shall be formed into compact groups suitably bound together and properly supported. Cable tie-wraps shall be used for the looming of internal and incoming cables within panels.

All conductors shall be terminated with suitable pressure type terminal lugs of proper sizes for terminal studs at the terminals blocks or shall be terminated in a manner compatible to the terminals of the instruments.

The control cable terminal shall be insulation displacement type or equivalent. The terminal shall also be provided with switch connection, removable switch blade.

All conductors shall run continuously between terminal studs without splices or taps. Terminal shields shall be provided for all incoming cables.

All conductors shall be labelled at each termination with wire number as designated on the circuit diagrams.

All internal cabling conductors shall be insulated stranded copper wire, rated at not less than 300V/500V for control cables; not less than 450/750 V for power cables.

Minimum cross-sectional area:

1. 1.5mm2 PVC cable for control/measuring circuits.

2. 2.5mm2 PVC cable for lightings and small power circuits.

All electrical cabling shall comply with the latest cable colour code as per SS638.

Overground (OG) Box

General

General

1. All components of the OG box shall be housed in a weatherproof housing of robust construction. The OG box to be constructed in accordance to type tested latest edition of BS EN61439-1 and IEC 439-1. The housing shall be provided with a watershed top. For OG-Box installed near traffic junction, pitched roof shall be provided to prevent the public from littering.

2. The housing must have a Degree of Protection of not less than IP54 and of robust construction.

3. The OG box shall be provided with a root of ample strength and suitable for mounting on a concrete/brick footing. A concrete plinth of minimum height of 400mm shall be provided for mounting of the OG box.

4. Each OG box shall be provided with 20% spare breakers and spare space. The overall rating, incoming cables and upstream provision shall be such that a 20% load increase for future expansion can be accommodated without alteration to the distribution system.

5. A space shall be reserved in the OG box for kWh meter installation. The door of the OG box shall come with a transparent UV resistance window with neoprene seal for meter reading purpose.

6. Hinged door complete with standardised lockset type of “A Series cam lock with Alloy Key” shall be provided at the front of the OG box. The door locks and keys for all the distribution boxes shall be similar and interchangeable. 3 sets of keys shall be provided for each OG box.

7. The OG box shall be of double leaf door type.

8. All electrical accessories such as HRC fuses, MCBs, ELR, timer, contactors, and electrical wirings in the OG box need to be neatly labelled.

9. Cable entry to the OG box shall be from beneath ground level. All the cable glands shall be equipped with entry thread seals to maintain the IP rating across the equipment-gland interface.

10. Inside the OG box at the bottom where the incoming underground cables are located, it shall be filled with “washed” sand to appropriate height.

11. The earthing system shall comply with the latest requirements stated in SS 638 and SS 551 and be connected in a ring to the earth bar in the OG box.

Housing

1. All components of the housing including pitched roof, except the housing bolts and nuts shall be made of at least aluminium alloy AA1100. The housing bolts and nuts shall be of stainless steel. The four (4) pillars of the housing shall be rounded with radii of not less than 25mm. This shall be extruded from 3mm thick aluminium in one homogeneous piece according to the latest edition of BS EN 1484 to provide a better mechanical strength. Roof and all other panels shall be ‘pressed form’ from a whole sheet of 3mm thick aluminium plate. All drilling, punching, cutting, bending and welding parts shall be completed and all burrs removed before the electrostatic powder coating process is applied.

2. The housing shall be electrostatically coated with pure polyester powder of thickness between 80 microns and 100 microns. Materials shall be chemically treated before and oven baked after the powder coating process. The powder coating shall be weather resistant.

3. Adequate ventilation shall be provided to permit natural circulation of air. Temperature-rise Limits of maximum 600 Amp rating to the latest edition of BS EN61439-1 and IEC 439-1. The ventilation apertures shall be suitably screened to prevent the entry of vermin and other foreign bodies.

4. The housing shall be able withstand a high voltage surge of 12kV to the latest edition of BS EN61439-1 and IEC 439-1.

Danger Notice

A ‘Danger’ notice shall be provided, stuck on the inside and outside of the door of each OG box.

Data Plate

A data anodized plate shall be fixed to each OG box detailing the following information:

1. LTA Logo

2. Manufacturer’s name

3. Contract Number

4. Date of manufacture

5. Serial Number

Door and Door Hinges

In general, the door shall be suitably designed to provide maximum protection from heavy driving rain and inclement weather. Access to the front of the OG box shall be by means of hinged doors. The hinges on the door shall not project outside of the shell and shall be secured by open flange fasteners. These fasteners shall be flushed and not be seen on the outside of the door. The hinges must enable the door to be swung open not less than 120 degrees from the closed position. Doors shall be easily detachable by lifting of pins from the hinges without having to use special tools and to be secured by medium security cam locks.

Pilar

1. The pillar shall be provided with a root of ample strength and suitable for mounting on a concrete / foundation at ground level. A removable apron of approximately 500mm with door closed height shall be provided at the front of the pillar to facilitate direct installation and jointing of cables to the distribution units. Sufficient number of uPVC pipes shall be provided and coordinated with Civil Contractor for cable entries into the box.

2. Provision for plastic pocket to house single line drawings (endorsed by LEW of appropriate grade) fitted inside the interior of the OG box door.

Power Supply Company’s Meter board

1. Power Supply Company’s meter board shall be installed for each OG Box in accordance with the requirements of the “Handbook on application for electricity supply”. There shall be one-meter board for each OG Box as shown on the drawings.

2. All arrangement for installation of the Power Supply Company’s meter, application for supply turn-on including liaison, co-ordination and obtaining power supply company’s approval for all the meter boards shall be included as part of the work. All fees and charges incurred shall be deemed to be included in the tender offer.

General

All main and sub-circuit cables shall be installed in conduits, trunkings, trays and ladders as appropriate. All the mains, sub-mains and final sub-circuits shall include insulated earthing conductor sized in accordance with latest SS 638.

All 3 phase circuits utilizing single core cables shall be laid in trefoil.

The current carrying capacities and voltage drops of cables shall be in accordance with latest SS 638, with ratings adjusted to suit local conditions.

The minimum size of cables shall be as specified herein, unless otherwise specified:

Normal, essential and control cables shall be installed in separate cable containments.

600/1000V AC Cables

General

1. All cables shall be 600/1000V grade. The conductor shall be of stranded conductor of plain annealed copper wire complying with latest IEC 60228 Class 2.

2. All earth cable shall be of insulated copper conductor type and rated at 600/1000V.

3. The D.C. resistance per kilometre of the conductor at 20 deg C shall not exceed the appropriate maximum value given in IEC 60228.

4. For multi-core cables, each conductor core shall be of the same crosssectional area.

All normal circuits cabling shall be of anti-rodent and anti-termite type.

All circuit serving essential and critical equipment required to operate under fire conditions and for continual operation respectively shall be of the fire-resistant type, anti-rodent and anti-termite type.

All circuit cabling shall be armoured type where installed in troughs, trenches, underground pipes, ducts or exposed to weather elements.

Cables exposed to weather elements shall be UV rated.

PVC Insulated and PVC Sheathed Cables

1. Cables shall be 600/1000V grade complying with IEC 60502-1, IEC 60502-2 and IEC 60502-4, copper core, PVC insulated and PVC sheathed.

2. Conductors shall be high conductivity stranded copper conductors complying with BS EN 60228 of sizes as shown in the Specification & Employer’s Drawings to SS 358 and IEC 60502-1, IEC 60502-2 and IEC 60502-4.

3. The insulation shall be PVC type A complying with BS EN 60811, IEC 60502-1, IEC 60502-2 and IEC 60502-4. Insulant colours shall be in accordance with current edition of SS 638.

4. The over sheath of the cables shall be an extruded layer of PVC complying with the requirements of IEC 60502-1, IEC 60502-2 and IEC 60502-4, BS EN 60811 type ST1 compound and shall comply with the requirements of BS EN 60332-1-1 and BS EN 60332-1-2 for flame retardant. The PVC material shall contain approved anti-termite additives.

Cross-linked Polyethylene Insulated Cables

1. Cables shall be 600/1000V grade complying with IEC 60502 copper core, XLPE insulated and PVC sheathed.

2. Conductors shall be single core high conductivity stranded conductors complying with BS EN 60228. For multi-core cables, each conductor core shall be of the same cross-sectional area.

3. The insulation of cores shall be cross-linked polyethylene complying with relevant BS EN 60502-1 and BS EN 60502-2. The insulation shall have a high degree of cross-linking, free from contaminants and air voids, good heat resistant and shall be treated by the extrusion process.

4. The XLPE insulation shall be suitable for use on power cables in wet and dry conditions at conductor temperatures not exceeding 90oC for normal operation and 130°C for emergency overload condition.

5. The bedding shall be an extruded layer of type 9 compound complying with the requirements of BS EN 60811, IEC 60502-1, IEC 60502-2 and IEC 60502-4.

Steel Wire Armoured Cables

1. Steel wire armoured cables shall comply with BS 5467.

2. The bedding shall be an extruded layer of type 9 compound complying with the requirements of BS EN 60811, BS 5467, IEC 60502-1, IEC 60502-2 and IEC 60502-4.

3. Each core of the cable shall be identified by the appropriate colour as specified in BS 5467 throughout the whole of the insulation.

4. Wire armour shall consist of a single layer of galvanized steel wires of sizes as shown in the appropriate table in BS 5467 and comply with BS EN 10257-1.

Fire resistant, LSOH materials shall meet the following latest requirements:

1. IEC 61034 and BS EN 61034-2 – Measurement of Smoke Density of Cables burning under defined conditions.

2. IEC 60331 and SS 299 – Tests for Electric Cables under fire conditions – circuit integrity.

3. Limiting Oxygen Index of at least 30, to ASTM D-2863

4. Temperature Index of 260°C, to ASTM D-2863

5. All insulation is to be moisture and heat resistant, with temperature ratings appropriate to the application conditions and in no case lower than 90°C

6. When a sample of cable is subject to the combustion test for the determination of the amount of halogen acid gases (other than hydrofluoric acid) as set out in IEC 60754-1 and the amount of halogen acid evolved is less than 5mg/g, the cable shall be regarded as zero halogen.

7. BS 6387 and SS 299 Fire and Mechanical Test Categories C, W, Z

Steel wire armouring for the cabling shall comply with latest BS EN 10257 1 and the entire assembly shall meet the requirements of latest BS 5467.

The above requirements shall be met without compromising the anti-termite (to comply with NEA regulations), anti-rodent, mechanical and electrical properties of the cables, both during and after installation, to meet the other requirements of the Specification.

Colour Coding

The cable core colour code shall comply with the latest SS 638 requirements.

Armoured Cable Installation

Compression glands shall comply with latest BS 6121 and shall be designed for the termination and clamping of armoured wires and shall be fitted with an earth bond terminal attachment. The function of the gland shall be to secure the armoured wires and provide electrical continuity between the armour and the threaded fixing component of the gland, and to give water-tight seals between the cable outer sheath and the gland and between the inner sheath and threaded fixing components. The armour for cables shall not be used as circuit protective conductor for carrying earth fault current. All armoured cable shall be terminated using a proper gland.

Where a watertight seal is required between the gland and equipment then the cable glands shall be equipped with entry thread seals. This is to maintain the IP rating across the equipment-gland interface, and such seals shall be fitted to the external side of the equipment. Earth tags/earth bond terminal connections shall not be fitted externally to the equipment if entry thread seals are used.

Jointing and terminating accessories shall include all necessary internal and external fittings and insulating materials. They shall also include precisely dimensioned cable stripping ferrules and the mechanical gland designs. It should be possible to erect and dismantle compression glands without the use of special tools.

All cables entering or leaving equipment shall be provided with separate termination and be spaced so that any one cable out of a number of such cables can be removed without disturbing the rest.

Cable armour shall be earthed at both ends of cable circuit.

Control and Sensing Cables

Control and sensing cables shall be of minimum rated at 300/500V grade, copper conductor, twisted pair and insulated, screened. Fire resistant cables shall be used for critical and essential circuits.

All control and sensing cable shall be appropriately colour coded and shall be installed in its own cable support system (e.g. conduit, tray, trunking etc). Sharing with power and lighting cable support system is not allowed.

The conductors shall be annealed, circular, multi-stranded, plain copper complying with latest IEC 60228. The multi-stranded conductor shall be rope laid with concentric stranded members in accordance with latest IEC 60228 Class 5 or 6.

Screening shall be achieved by the use of laminated tape, consisting of an aluminium foil bonded to a polyester film for strength, applied to the cable with an overlap so that the conductors are fully covered.

A drain wire or continuity conductor, laid under and in contact with the aluminium foil shall be provided and shall be in accordance with BS EN 50288, as appropriate. The tinned annealed copper conductor, which may be of solid or stranded construction, in keeping with current manufacturing techniques, shall have a minimum area of 0.5 mm².

The maximum resistance of the drain wire or continuity conductor provided shall meet the requirements of BS EN 50288.

Cable Installation

Power cables and control cables shall be run in separate cable trays / trunkings / conduits.

Cables shall be terminated using suitably crimped cable lugs and brass glands with rubber gasket.

All cables shall be adequately protected against risk of mechanical damage to which they may be liable in normal conditions of service.

All cables shall be installed in accordance with latest SS638.

Where single-core cables are used for 3-phase circuits, the cables shall be grouped in trefoil and spaced from other cables.

Cable joints and splices shall be prohibited.

Where cables pass through holes in metalwork, precautions shall be taken to prevent abrasion of the cables on any sharp edges.

Where appropriate, final connections to fixed equipment shall be by means of cables in flexible conduits.

All cables shall be provided with identification marks for identification of circuit number and phase at each end of the cable, at entry and exit points of cable installed in ducts and in such other position as are necessary to identify and trace the route of any cable.

Every single core cable and every core of multi-core cables shall be provided with identification at its termination in form of tapes sleeves or discs of appropriate colours and alpha numeric notation in accordance with the latest revision of SS 638.

General

All cable support and accessories (except underground uPVC pipes) shall be made of hot-dip galvanized steel in accordance with the latest relevant Clauses of BS EN ISO 1461. Standard proprietary fittings shall be used. All drilling, punching, cutting, bending and removal of burrs shall be completed before galvanising and any surfaces that have been scratched, marred or otherwise damaged shall be made good with a comparable zinc coating.

All metallic cable trays, trunking and conduits shall be earthed in accordance to SS 638.

Cables on tray work shall be single tiered and installed in a neat fashion. All cables shall be fixed to tray work using clips and straps designed for this purpose and complied with the relevant Code of Practice.

All non-sheathed electrical cables shall be installed in screwed heavy gauge welded steel conduit (surface or embedded) or trunking. All cable containment shall be of adequate size (including 20% spare capacity) and lengths for the cabling system.

All normal, essential and control cables shall be installed in separate containment.

All holes cut in cable trays or trunkings for the passage of cable shall be provided with grommets. Whenever conduits, cable trays or trunkings pass through an opening, the Contractor shall be responsible for sealing the gaps between wall/floor and conduits, cable trays or trunkings and within trunking with sealing material having the same fire-rating as the wall or floor.

Propose the colour of cable support system shall subject to Authority's acceptance prior to procurement and installation work.

The word ‘ELECT-N’ (for normal circuit), ‘ELECT-E’ (for essential circuit), ‘CTR’ (for control), ‘TEL’ (for telephone distribution) in black shall be marked on the underside of the cable trunking / tray. The spacing between markings shall not exceed an interval of 3m. The method of labelling shall be submitted for the Engineer’s acceptance.

All electrical services support / bracketries shall be deemed included for completion of installation.

Draw pits, cable troughs, cable trenches shall be filled with sieved sand and covered up. Cable trenches and cable troughs that are provided with drainage will not be required to be filled up with sand.

Manufacturer’s purpose-made accessories (e.g. bends, corners, intersections, tees, risers, reducing section etc.) shall be used.

All cable support and accessories installed in corrosion prone environment shall be suitably protected against corrosion and applied with rustproof paint under the environment and conditions in which the cable support and accessories are installed in.

Sufficient space shall be provided and maintained above cable supports to provide adequate access for installing and maintaining the cables.

Where cable supports pass through expansion joints, allowance shall be made for movement of the structure while maintaining earth continuity.

Cable Trunking

All trunking shall comply with latest SS 249 and be constructed of zinc coated mild steel sheets, finished with one coat etching primer and powder epoxy coating. Hotdip galvanised trunking shall be used for installation within corrosive areas, outdoor and in wet areas. Trunking shall be fitted with removable covers of the same material, extending over the entire length of the trunking. The thickness of the steel sheet shall be minimum 1.2mm for sizes up to 150mm x 150mm and minimum 2mm thickness for larger sizes.

Trunking supplied shall be complete with purpose made connectors, dividers, flanges and retaining clips including cable pin tacks to avoid strain on cables on extended vertical runs. Trunking for cables on extended vertical runs more than 2.5m shall come with an integrated rung slots of 50mm width and of minimum thickness of 2.0mm spaced at maximum 300mm. The contractor shall ensure that effective cross sectional area shall not be affected by the integrated rung and provision of the necessary reducers are included in this contract.

Trunking shall be fixed rigidly to walls and ceilings with appropriate brackets at not more than 1000 mm centres. Approved metal expansion anchors shall be used for fixing to walls and wooden or fibre plugs shall not be used for this purpose. The type and position of the screw heads within the cable carrying compartment shall be selected to minimise the likelihood of damage to cables during installation.

All lid fastening components shall be captive and arranged such that lids can be easily removed without damage to cables. When fastened, the lid shall be securely held tight to the trunking body along the whole length.

Suspended trunking shall be supported at not more than 1000mm centres.

Approved metal expansion anchors shall be used for fixing the support to walls and ceilings. The type and position of screw heads within the cable carrying compartment shall be selected so as to minimise the likelihood of damage to cables during installation or operation.

Cable Trays

Cable Trays shall be of the perforated, heavy duty return flange type and manufactured to latest IEC 61537 or BS EN 61537 and accessories to latest BS EN ISO 1461 and shall be constructed of perforated mild steel, electro-galvanised with an epoxy powder coating. The minimum thickness for cable tray up to 450mm wide shall be 1.5mm, for widths above this 2mm sheet shall be used. Hot-dip galvanised cable trays shall be used for installation in outdoor, tunnel/viaduct and wet areas.

All cable trays shall incorporate a return flange 10mm high for widths up to 250mm and 20mm above this value. Bends and tees shall be identical in construction material and profile to straight runs and all bends shall incorporate gusseting to standard radii.

Cable tray shall be supported at intervals by galvanised steel hangers fixed to walls or ceilings as applicable at maximum of 1000mm centres and 300mm on bends and at tees. Earth continuity copper links and tray connections shall be installed in accordance with the manufacturer's recommendations.

Standard proprietary fittings shall be used.

Cable trays shall be cut along a line of plain metal (i.e. not through perforations) only. All cut edges shall be cleared of sharp edges and burrs and treated with zinccoated paint to ensure continuous protection.

Cable Conduits and Fixings

Conduits and fixings shall be manufactured in accordance with latest BS EN 61386-1 and IEC 61386-23. The minimum nominal bore diameter of conduits shall be 25 mm. Conduits shall be of heavy gauge, hot dipped galvanised welded steel, screwed and longitudinally welded and protected against corrosion to latest IEC 61386-1 and BS EN 61386-1 Class 4. Conduits shall have threaded ends and conduits embedded in concrete shall have the threads coated with jointing compound during assembly. Care shall be exercised to ensure that the conduit and boxes are water-tight before concrete is poured, this may include the use of metal caps or plugs to prevent water or entering the open ends. All conduit fittings shall be hot-dip galvanised or of corrosion resisting materials.

The ends of all conduits shall be reamed to remove all burrs and sharp edges after screw threads have been cut. The exterior shall be made free of all dirt, oil and grease and the interior swabbed through before the installation of cables. All exposed threads and bends shall be given a coat of zinc rich paint after installation. All conduits termination should be non-swivel type.

The ends of all conduits shall be installed solidly in all couplings. Where conduits terminate in fuse switches, distribution boards, adaptable boxes or similar accessories, they shall be connected by means of smooth bore male bushes, compression washers and sockets. The integrity of the protection rating of the equipment or accessory shall not be reduced as a result of the conduit connection. Final connections to motors or other equipment subject to movement or vibration shall be made with short lengths of appropriately sized flexible steel conduits with appropriate adapters. All free ends of conduits shall be fitted with a smooth bore male brass bushing.

Each run of conduit shall be assembled with draw-wires. Long radius bends shall be used although not more than two right angle bends shall be installed without the interposition of a draw box. Full size junction boxes and not box type tees, elbows, or fittings shall be used to facilitate the drawing in of cables and the possible subsequent removal and replacement of any one cable or group of cables without disturbing the rest. Draw boxes shall be installed such that the maximum run length between draw points is 10 m.

Conduits shall run parallel to walls, floors and ceiling wherever possible. Multiple conduit draw-in boxes shall be used wherever a number of conduits follow the same route. All conduit fixings and boxes shall be screwed to or on walls and ceiling independently of the conduit unless such fixing is demonstrated to be impractical due to damage of weather-proofing or similar.

Approved metal expansion anchors shall be used for fixing to walls and wooden or fibre plugs shall not be used for this purpose. Fixing holes in boxes shall be adequately countersunk to ensure that screw heads do not protrude into the wireways.

For embedded conduit runs, deep boxes or extension rings on standard boxes shall be used to ensure that the front of each box finishes flush with the surface of the wall or ceiling. All junction and pull boxes shall be installed so that covers are readily accessible and removable after completion of the installation. Boxes shall not be installed above suspended ceilings, except where the ceiling is of the removable type and definite provisions are made for access at a point close to each box.

Conduit back boxes shall be provided where conduits turn through walls. Conduits crossing expansion and contraction joints shall be provided with a short-length of flexible metal conduit, sufficient to allow for a movement of 10 mm.

Conduits shall be fixed by means of hot-dip galvanised full saddles at maximum 1000 mm centres on vertical runs and maximum 750 mm centres on horizontal runs. All conduits shall be fixed by full saddles at a maximum of 300 mm each side of a bend and vertical conduit runs shall have saddles within 300 mm from their points of emergence from floors or ceilings.

Conduits in ceiling cavities shall be supported independently of the suspended ceiling fixings. Concealed conduits chased into surfaces shall be secured such that the fixings alone hold the conduits in place. Recesses in plaster shall be deep enough to permit a full 6 mm cover over the entire run of the conduit.

The ingress protection of the boxes and fittings shall be appropriate for the environment in which the conduit shall be installed. Where appropriate, provision for tapping of condensed moisture shall be made. Watertight cast iron boxes shall be used in wet or damp locations. Outlet, junction and pull boxes for use inside the building shall be zinc-coated.

PVC coated flexible conduits and fittings shall comply with latest IEC 61386-23. The flexible conduit adapter shall be of watertight, metallic and nickel plated and shall be secured to the flexible conduit via an internal threaded appendage to ensure that the sharp edges of the flexible conduit are not in direct contact with the cables.

uPVC Pipe and Accessories

uPVC Pipe and accessories for underground cables shall be Class B heavy-duty type and comply with SS141.

All pipes shall not be less than 25 mm in diameter.

General

Electro-galvanised with an epoxy powder coating boxes shall be used as junction boxes (IP65), pull boxes or terminal boxes in exposed or embedded conduit. Stainless steel boxes (IP65) shall be used for installation in outdoor. The boxes used shall be sized to code requirements. Boxes shall be provided where surface mounted cables interface with embedded conduits for proper termination of cable and cable fittings. Outlet, junction and pull boxes for use indoor shall be zinccoated.

All lighting switches, switched socket outlets, and isolators shall be labelled by an approved means to identify the circuit number and the source of supply to which they are connected.

Electrical fittings and accessories used for outdoor, tunnel, wet and dusty areas shall be IP65.

Lighting Switches

Lighting switches shall be of silent action type and comply with latest IEC 60669 and SS 227. Matt-chrome type shall be provided for recessed installation. Metal clad type shall be provided for surface mounted installation. All lighting switches shall be rated at a minimum of 10A each and withstand the inrush current of the LED luminaires.

Lighting switches shall be mounted at a height of 1200 mm above finished floor level to the bottom of the mounting box. All lighting switches shall be mounted on the active door side. The actual positions shall be coordinated on Site.

All lighting switches, either flush or surface mounted, shall be mounted on malleable iron or pressed steel boxes to latest BS 31.

Where switches are located in exposed situation and wet area, switches shall be non-metallic weatherproof type to IP65. In other areas, switches with the appropriate IP rating shall be provided to suit the particular location.

All light switches associated with essential supplies shall be provided with red rocker switches.

Intelligent Lighting Detection System (ILDS)

Controller for ILDS

1. The controller shall reside within the OG Box. In the event where controller is unable to be located within the OG box (for A&A works), the controller shall be housed in a separate controller box of outdoor type, weatherproof to IP 65 and of robust vandalproof construction minimum IK06.

2. Internal wiring conductors shall be stranded copper wire, not less than 450/750 V class PVC insulation.

3. Controller Box

   1. The housing shall be made of sheet steel with thickness of not less than 2.5 mm. The controller box shall be sprayed with 1 coat of anti-rust primer and 2 finishing coats of paint colour to the Authority’s approval.

   2. The metal enclosure shall be completed with hinged doors and to be provided with standardised lockset type of “A Series cam lock with Alloy Key” and 3 sets of key.

Motion Sensor

1. The motion sensors of the ILDS shall be encased in enclosure box to prevent from vandalism and rated to IP65.

2. The motion sensors shall be provided with Passive Infrared and Ultrasonic Technology to detect and confirm occupancy.

3. The motion sensors shall be equipped with wide angle to cover maximum area and dual pyro-electric sensing element shall be provided to reduce background noise. There shall be a visible indicating light at the individual sensor to indicate the health status of the sensor. In the event of any sensor failure, all the lights shall be automatically switched on.

Switched Socket Outlets

Switched socket outlets shall be single pole (13 A) metal-clad or matt-chrome, 3 rectangular pin switch shuttered outlets, either surface or flush mounting according to location. All switched socket outlets shall be EMA approved type and tested by a recognised testing body.

Switches shall be of the quick make, slow break type with silent, totally enclosed switch action and solid silver alloy contacts. Switched socket outlets for indoor use shall be housed in suitable galvanised steel boxes to BS 4662 with conduit knockouts.

Switched socket outlets located in exposed and wet areas shall be of weatherproof type to IP65. Earth terminal shall be provided inside the socket outlet. Switched socket outlets located in public areas shall be complete with padlockable cover plate.

15A switched socket outlets shall be 3 pin round type to BS 546 shuttered, of a finish similar to 13A switched socket outlets and mounted in flush steel conduit boxes. Earth terminal shall be provided inside the socket outlet.

Switched socket outlets in all mechanical plant rooms, electrical sub-stations and switch rooms shall be of the metal-clad type with surface-mounted conduit boxes.

Isolators

Isolators shall be of either double pole or four poles with current ratings fit for the purpose and shall be enclosed, metal-clad with positive quick-make and quickbreak action. Padlock facility shall be provided such that the isolator could be locked in the “OFF” position.

Isolators shall be capable of passing and also interrupting their full rated current safely and without damage. Ferrous materials shall be galvanised, switch handles shall be interlocked to prevent opening the over with the switch “ON”.

All isolators for general applications shall be of the quick-make air-break type to latest IEC 60947-3 with a Utilization Category of AC 23A.

All isolators shall be of 20A minimum rating and metal clad enclosure type. Each isolator shall be complete with dust-tight gaskets and earthing terminals, and fitted with an engraved label bearing the description of the appliances it controls and circuit label.

Fused Connection Unit

Fused connection unit shall be of switched or un-switched type, each comprising of a fuse carrier fitted with a 13 amps cartridge fuse link to latest BS 1362, an outlet for connection of flexible cord up to 4 sq. mm, 3 core, terminal block, etc. Each connection unit shall have a built-in safety shutter which closes over the live contacts immediately the fuse carrier is withdrawn.

The carrier shall secure firmly in position by a screw but automatically withdraw from the live socket as the screw is released. The connection units shall be of flush wall mounting type and housed in suitable galvanised steel boxes to latest BS 4662 with conduit knockouts. The finishes of fused connection units used at the various areas shall be as specified for the lighting switches.

All components within the luminaries shall preferably be from the same manufacturer to ensure compatibility. All similar items of equipment shall be interchangeable.

Unless otherwise specified, all luminaries offered shall be as per manufacturer’s standard, except that all luminaries shall be modified, if not already catered for, to accept conduit termination, without affecting the quality of the product.

Luminaries

General

1. All luminaires mentioned in this criteria shall mean Light Emitting Diode (LED) luminaires unless otherwise stated.

2. The LED luminaire, including the LED’s, its associated electronic control gears (Driver) and all accessories, shall be designed for lasting operation. The luminaire and its driver shall be able to fully withstand the current voltage surges of lightning strikes and the frequent switching operation of the power supplies. The luminaire and driver shall be carefully selected and designed to ensure that the functional characteristics, failure rate, operating life span and other requirements in the specifications are fully met.

3. Each luminaire shall consist of 2 main components consisting of an independent LED Module and Electronic Control Gear (driver).

4. The rated LED life L80/B20 shall be more than 50,000 hours at LED operating at 25 °C for indoor with air-conditioning and 35 °C, for all other areas, unless otherwise stated.

5. The luminaire shall be two feet long and the main components shall be easily replaceable without removing the whole light fitting. Four feet luminaire can be considered subject to approval.

6. Tests report from International Accredited Test Lab or local accredited SINGLAS test laboratories or independent third party test reports on safety, reliability and performance of luminaires shall be provided.

7. A CLO (Constant Light Output) shall be provided to allow constant lumen output throughout the lifetime of the luminaire and will result in lower average power consumption.

Performance Requirement

1. Luminaires

   The luminaires shall be of robust constructions which combine excellent functional and visual design. Where the luminaires are to be exposed to weather, it shall be of dustproof and jet-proof to IP65 and vandal-proof of minimum IK 06, unless otherwise stated.

   Where the luminaires are subjected to vandalism, it shall be design with minimum IK06 rating, unless otherwise stated.

   System power shall not exceed 11W and lumen output shall be more than 600 lumens for two feet long luminaire.

   The luminaires shall be provided with adequate thermal performance for the continuous operation of the LED at an ambient operating temperature of not less than 35 °C in accordance with relevant local or international standards. The LED junction temperature shall be maintained at or below manufacturer’s recommendation.

   The luminaire shall comply with the requirements of safety extra-low voltage (SELV) system.

   Each type of luminaire shall be tested to its relevant standards as follows:

   IEC 60598-1	Luminaires - Part 1: General requirements and tests
   IEC 60598-2-1	Luminaires - Part 2-1: Particular requirements - Fixed general purpose luminaries
   IEC 60598-2-2	Luminaires - Part 2-2: Particular requirements - Recessed luminaires
   IEC 60598-2-5	Luminaires - Part 2-5: Particular requirements - Floodlights
   IEC 61000-3-2	Electromagnetic Compatibility (EMC) - Part 3-2: Limits - Limits for harmonic current emissions (equipment input current ≤16A per phase)
   IEC 61000-3-3	Limitation of Voltage Changes Voltage Fluctuations and Flicker in Public Low Voltage Supply Systems for Equipment with rated current ≤ 16A per phase and not subject to conditional connection
   IEC 61347-1	Lamp control gear - Part 1: General and safety requirements for the driver
   IEC 61347-2-13	Lamp control gear - Part 2-13: Particular requirements for d.c or a.c supplied electronic control gear for LED modules.
   IEC 61547	Equipment for general lighting purposes - EMC Immunity requirements
   IEC 62031	LED module for general lighting - Safety Specification
   IEC 62384	DC or AC supplied electronic control gear for LED modules - Performance requirements
   IEC 62471	Photo-biological safety of lamps and lamp system
   IEC 62493	Assessment of lighting equipment related to human exposure to electromagnetic fields
   IEC 62778	Application of IEC 62471 for the assessment of blue light hazard to light sources and luminaires
   IES LM 79	Approved method: electrical and photometric measurements of solid-state lighting products
   IES LM 80	Approved Method: measuring lumen maintenance of LED light sources.
   IEC 55015	Limits and methods of measurement of radio disturbance characteristics of electrical lighting and similar equipment
   ISO/IEC 17025	General requirements for the competence of testing and calibration laboratories
   IEC 62717	LED Modules for General Lighting - Performance Requirements
   IEC 62722-1	Luminaire Performance - Part 1: General Requirements
   IEC 62722-2-1	Luminaire Performance - Particular Requirements for LED Luminaires

   For information panel lighting, it shall be tested to IEC 62031, IEC 60598- 1, IEC 62384, IEC 61347-1, IEC 61347-2-13 and IES LM 80.

   The LED luminaires shall be of proven track records and type-tested to the requirements as specified. All tests shall be carried out by accredited bodies, laboratories or facilities certified under ISO/IEC 17025. The Contractor shall submit all relevant track records, type test reports, and test certificates for the Authority’s approval.

   The luminaires shall be free of light leaks when installed in their intended locations or where forming part of a ceiling system. All luminaires specified for use in metal strip ceilings shall be shrouded to prevent light leaks visible through the slits.

   All fascias and other parts shall be securely located and positioned using spring clips or similar devices such that under no circumstances can the fascias or other parts become dislodged or displaced.

   The trims of all recessed luminaires shall be designed to be rigid and shall finish in contact with the ceiling at all points.

   Clips and other devices wherever used shall be designed not to deform under in-service conditions.

   Surface mounted luminaires shall be fixed by means of a minimum of two screws, caddy clips or studs with nuts.

   All screws, nuts, bolts, clips, washers and similar fittings shall be galvanized. Where galvanizing is not possible owing to tolerance limitations, stainless steel shall be used.

   Every luminaires shall have power factor of not less than 0.9 lagging and be complete with power factor correction component where necessary.

   Cut out and recess depth dimensions shall be supplied in writing for coordination purposes.

   No cabling shall be visible behind or around installed luminaires when viewed from below the ceiling.

   The luminaires shall be easily installed and removable for maintenance from below the ceiling surface, or where recessed in walls, from the front.

   The temperature of the outside surface of any luminaires shall not exceed 80°C or that required by the relevant Singapore Standards Code of Practice.

   During normal operation, the electrical components of luminaires shall not exceed a noise level of PNC (Preferred Noise Criteria) 36, measured at 1 metre from the luminaires or that specified in ISO 3741. A predominance of audible pure tone hum buzz produced by luminaires will not be acceptable.

   The earth leakage of each luminaires shall not exceed the specified value in accordance with latest IEC 60598.

   Stainless steel safety chain shall be provided to hold loosed components such as reflector and diffuser. For high bay and low bay luminaires, stainless steel safety wire chain shall be provided to hold the luminaire.

   Appropriate cable entry opening shall be provided.

   Luminaire Maintenance Factor (MF) vary according to the intervals between cleaning, the amount of atmospheric pollution and the quality of the sealing of the LED module housing of the luminaire. Their values may be established by field measurements. Luminous flux maintenance factors vary according to the type of LED and power. Values are usually available from LED module manufacturers. However, a 0.9 maintenance factor shall be adopted for the purposes of producing the lighting simulation design.

2. LED Module

   The LED module shall have the following information distinctly and durably marked:

   1. Trademark or mark of origin (Brand & model of LED used)

   2. Nominal Wattage

   3. Correlated Colour Temperature (CCT)

   4. Colour Rendering Index

   5. Weight

   6. Marking requirements in accordance to relevant local or international standards

      The LED Module shall have the following features:

      Heat sink with high thermal dissipation properties

      Provisions to prevent unauthorized removal.

      Corrosion resistant.

      Optics shall be UV coated

      Operate in relative humidity of greater than 90%

      The LED modules shall be adequately supported to ensure that breakages do not occur through vibration or shock.

      The rated LED life L80/B20 shall be more than 50,000 hours, unless otherwise specified.

      LED module shall have nominal colour temperature of 3000K for outdoor and 4000K for indoors, unless otherwise specified.

3. Electronic Control Gear (LED Driver)

   The LED driver shall comply with the requirements of safety extra-low voltage (SELV) systems.

   The LED driver shall satisfy the following requirements:

   Life Span	50000 hours of operations at max case temperature of 70 °C or higher
   Power factor	0.9 or better
   Rated input voltage	AC 230 +/- 10 % 50Hz
   Operating Temperature	20 °C to 45 °C
   Storage Temperature	20 °C to 85 °C
   THD	< 15%
   Efficiency	> 80%

Accessories

1. LED Module / Driver – DC Cable Coordinator and Internal Wiring.

2. DC cable connector and internal wiring shall be provided between LED driver and LED module.

3. LED module connector shall be plug type.

4. LED driver connector to the LED module shall be socket type.

5. The cable length between LED module and remote LED driver shall be coordinated on site with sufficient slack and shall be compatible with the prescribed DC cable connector.

6. DC cable connector shall be rated at IP 67.

Photometric Performance

1. The luminaires shall comply with the photometric performances where specified.

2. Where it is specified that a luminaires shall be submitted for photometric testing, or where a luminaires is submitted as an alternative to a specified item, the minimum photometric submission shall comply with the following:

   1. Light Output Ratios

      Polar Lighting Distribution Diagram

   2. Utilisation Factor Table

   3. Coefficient of Utilization Curves

   4. Candela/m2 measurements

   5. Isolux Diagram

3. All photometric data shall be provided in a format acceptable to one of the following bodies:

   1. Local SS 638, SS 530, SS 531 and SS 563

   2. IEC

   3. C.I.E

   4. CIBSE

   5. BS

   6. I.E.S of North America

Manufacturers Catalogue Numbers

1. The statement of a manufacturer's catalogue number or other identifying symbol in the luminaires schedule does not relieve the Contractor's responsibility of ensuring that luminaires fully comply with the requirements of this Specification. The luminaires description and the manufacturer's catalogue numbers are intended to be complementary in describing the proposed luminaires.

2. Luminaires shall not have any labels showing the manufacturer’s name or trademark visible on the outside. Labels inside luminaires or light shrouds shall not be of self-adhesive type.

Metal Work

1. Housing

   Unless otherwise specified luminaires shall be constructed of not less than 0.8mm thick zinc anneal sheet steel or better. The zinc anneal grade shall be suitable for use in the specified application. The sheets shall be free from surface blemishes, scratches and other defects.

   Welds, which will be visible after the luminaires is installed, shall be ground, properly filled and rubbed smooth.

   The luminaires shall be truly square and rigid, free from distortion, with properly fitting parts and be totally suitable for mounting in the locations specified.

   External luminaires shall be manufactured from aluminium, stainless steel or other approved corrosive resistant material.

   All parts constructed of steel shall be cadmium plated or paint finished zinc anneal sheet steel.

2. Reflectors

   All reflectors used in downlights and wall washers shall be high purity (99.85% pure) aluminium unless specified otherwise. The aluminium thickness shall be 1.0mm minimum, and be finished in an anodised specular finish with a minimum build-up of 25 micro-meters. Specular reflectance shall be not less than 80%.

   Reflectors shall be completely free of spinning or tooling marks, indentations or scratches. Rivets or similar shall not be visible with the reflector in normal operating position.

   Where stippled reflectors are specified, the surface finish shall be matte.

3. Aluminium

   Aluminium and aluminium alloys used in the construction of luminaires shall be anodized. Such anodizing shall be applied after the base metal has been ground smooth and prepared.

   Aluminium alloys used in outdoor fittings shall be LM6 grade or better. Anodic finishes shall be built up to conform to latest BS EN ISO 7599 and BS 3987.

4. Stainless Steel

   Stainless steel materials shall comply with latest BS 1449. All soldered and welded joints shall be ground smooth.

Terminal Blocks

1. Terminal blocks shall be mounted close to cable entry points using the continuous strip removable insert type, or an extended insulating base.

2. Each terminal block shall include a spare, insulated looping terminal and shall be suitable for 2 x 2.5mm² conductor minimum. Fittings with a cord and cap need not be provided with a spare looping terminal.

3. Terminal blocks on luminaires shall be ceramic type.

Earth Screw

A captive brass earthing screw comprising locking brass nut and two brass washers shall be located adjacent to the terminal block and shall be clearly identified.

Wiring

1. The inter-component wiring used shall be heat resistant type with a temperature rating of minimum 105°C. The temperature rating shall be marked on the insulation. Samples of the heat resistant cable and cable manufacturer specification shall be submitted to the Engineer for approval.

2. Inter-component wiring for remote LED driver, battery pack to the luminaires shall be FR cable for emergency lighting and FRT cable for normal lighting. These cables shall be housed in flexible conduits.

3. Clips shall neatly secure wiring and strapping with adequate slack to ensure that it is retained clear of all hot parts.

4. Where luminaires are intended for operation in high ambient temperature areas, suitable heat resistant type cables shall be used.

5. Cable entry holes in the luminaires shall be located and bushed to keep sub-circuit wiring clear of hot parts. An approved cable clamp suitable for clamping up to 3 entering cables shall be installed inside the carcass of each fitting adjacent to the entry hole.

Mounting of Components

1. All components in the luminaires shall be secured by means of either metal thread screws or threaded studs and nuts.

2. LED drivers shall be fixed in the optimal location for maximum heat dissipation.

3. Where remote LED driver / transformer / battery pack enclosures are provided they shall be securely mounted from the building structure and suitably positioned to allow for air circulation, preferably by rods suspension in the ceiling space.

4. Enclosures shall not be placed on the top surface of ceiling structures.

Diffusers and Lens

1. All diffusers shall be of acrylic material rigidly constructed and symmetrically formed with edges aligned and squared. Polystyrene diffusing materials shall not be used.

2. Diffusers shall not deflect under the effects of ageing, heat, or radiation by more than 1% of the minor unsupported distance subject to bending stress.

3. The minimum nominal thickness of any diffuser panel shall be 3.0mm.

4. Glass spreader lens units, where specified, shall be constructed from prismatic "Pyrex" or equivalent glass. Lens shall be positively held within the luminaires by circular lens housing or pressure clips (minimum of 3 per lens).

5. Diffusers shall be attached to the luminaires with flexible stainless steel safety wire chain to facilitate maintenance.

Emergency Luminaires

Emergency luminaires shall be individually equipped with battery pack to provide illumination upon sensing of power failure. All emergency luminaires shall comply with latest SS 563 and type tested by accredited testing bodies subject to acceptance by the Engineer.

Batteries shall be sealed nickel-cadmium re-chargeable type to IEC 61951-1 and shall be capable of continuous operation at cell wall temperature of 60 °C.

The charger shall be fully automatic, solid state constant voltage type, with electronic circuitry to protect the batteries against over-charge and over-discharge. The charging system shall be capable of re-charging the battery to full capacity in not more than sixteen (16) hours after a total discharge of the battery.

The control circuits shall be suitable for 230V mains operation, where applicable, and shall be designed to enable the luminaires to operate exactly like normal conventional luminaires. An unswitched live wire shall be connected to each and every luminaires with emergency pack so that the luminaires can be switched off either from the associated lighting switches, timers, contactor, etc. However, irrespective of the status of the light switch or the controlling contactor, the luminaires shall automatically illuminate or remain illuminated upon mains failure. Upon restoration of the mains supply, the luminaires shall be switched back to mains supply operation and the batteries shall be re-charged again automatically.

A circuit switch shall be incorporated in the control circuit to enable testing of the circuit to be carried out. A green LED light shall be provided to show ‘mains supply healthy’.

A fused terminal block fitted with cartridge fuses of appropriate rating shall be provided separately for both the charge and the maintained circuit.

Provision of space shall be made in all luminaires to incorporate emergency battery packs. Where it is not practicable, the battery pack shall be mounted remotely within a box with brackets including proper protection to the interconnecting cables and cables entries. All cost of brackets, boxes, etc necessary for the provision of remote battery pack shall be included in the Contract.

Self-contained battery pack in all emergency luminaires shall be charged continuously and the charging wire shall be taken from the unswitched side of a circuit. Where a self contained emergency power kit complete with a separate LED module is included in a normal luminaires, the supply to the power equipment shall also be from the unswitched side of the supply.

When the emergency luminaires is worked on its own self-contained battery power, the emergency lumen output shall comply with latest SS 563. The Contractor shall submit computer lighting simulation report for Engineer’s acceptance to demonstrate the minimum illuminance achieved by the proposed equipment meets the requirements.

The Contractor's Qualified Person (QP) shall submit the Qualified Person’s Certification of Illuminance of Emergency Luminaires under emergency condition for the stations.

Bus Stop Beacon Light

The contractor shall be provided weather proof type (IP65) and vandal-proof of minimum IK06 for bus stop beacon light located at bus shelter area.

The luminaire output shall comprise of horizontal output of 360 degrees and operating temperature shall be up to 80°C.

The bus stop beacon light module shall be suitable for use on a supply voltage of 12V. The contractor shall provide Power Supply Unit (PSU) to step down the voltage. PSU shall be suitable for use on a supply voltage of 230, +/- 10%, 50Hz +/-10%.

LED Exit Sign

General

1. All LED Exit signs shall be tested by approved testing laboratories and complying with latest SS 563. A valid test certificate shall be submitted for purpose of TOP application.

2. LED Exit signs shall be maintained type and the control gear shall comprise an emergency lighting control unit complete with rectifier, charger and nickel cadmium batteries. Batteries shall be capable of continuous operation at cell wall temperature of 60° C.

3. Each LED Exit sign complete with battery pack shall have its own set of green light emitting diode, charging circuit and test switch.

The control unit shall be capable of operating the lamp during emergency condition for duration of at least 2 hours. A green light emitting diode shall indicate that main supply is healthy and charging circuit is complete. Emergency operation shall be tested by a `Press to Test' switch, whilst mains supply is healthy. The LED and test switch shall be visible when viewed from below and are easily accessible.

1. The LED Exit Sign shall be self-contained type rated at 2 hours minimum.

2. The dimension of LED Exit signs for all areas shall be complete with fire retardant perspex panels and casing matching to the powder coated galvanized steel support. The LED Exit signs shall be single sided or double sided with or without directional arrows to suit the fire escape requirements of architectural layouts.

3. Cables for suspended and cantilevered LED Exit signs shall be run in flexible conduits encased in powder coated or galvanised steel support complete with escutcheon cap.

4. LED lights in LED Exit signs shall be easily replaceable.

General

All metal conduits, trunkings and tray systems, supports, cabinets, metal parts of switch gear, equipment cases, motor frames, cables screen and armour, electrical fittings and fixed appliances liable to become live in the event of insulation failure, shall be effectively earthed by means of earth continuity conductors of adequate size. The entire earthing installation shall fully comply with the latest requirements of SS 638 and SS 551.

The earthing continuity conductor shall be of high conductivity copper and continuous throughout its length without joints except by exothermic conductors.

Bonding connections shall have a warning label fitted, marked “Electrical Earth - Do Not Remove”.

All extraneous conductive parts e.g. metal structure, lamp post and bus service numbers post shall be bonded to the DB earth bar. The electrical bond shall be by means of purpose made clamps or welded where possible.

Earthing Connections

Earth continuity conductors from all exposed metal parts of equipment required to be earthed including earth connections to plug sockets shall be connected by one of the following appropriate methods:

1. To earth connection at the distribution board supplying the equipment on plug socket.

2. To any point on the sub-main or main earth continuity conductors supplying the relevant equipment.

3. To residual current circuit breaker where installed.

Labels

A label including the result and date of testing shall be provided next to the earth bar.

A label indicating the earth bar number shall be provided next to the earth bar.

All labellings for earth bar and earth termination box shall be reverse-engraved on traffolyte plate.

Both ends of the earth cable shall be labelled. The labels shall indicate the origin and the destination of the earth cable.

Earth Termination for OG Boxes

The earth electrode shall be housed inside heavy-duty earth pit with hinged or chained hot-dipped galvanised lid cover of dimension 300mm x 300mm haunch in concrete. Where electrodes are planted on roadside or pavement, they shall be protected by angle steel reinforced chamber with 10mm thick steel checker plates.

The earthing pit on turf area shall be reinforced with concrete support. All earth pits shall be filled with sand.

Earthing rods shall consist of a minimum of 2 nos. 1.8 m length, 16 mm diameter copper bond steel.

Testing of Earthing System for OG Boxes

The system shall be tested for, resistance to earth of the electrodes and electrical continuity of earthing system.

The layout drawings showing the positions of earthing termination and test results shall be submitted for Authority’s acceptance.

The LED module shall have the following information distinctly and durably marked:

General

This section of the specification provides for the supply and installation of a complete lightning protection system. The installation shall comply with the requirements of SS 555 and any additional requirements of this specification.

A Qualified Person (QP) shall be engaged to supervise the lightning protection system installation and submit the certificate of supervision of lightning protection system.

Any holes drilled in roof coverings and any penetrations through waterproofing membranes shall be rendered watertight to the acceptance by the Authority.

All lightning protection system components shall comply with IEC 62561.

The lightning protection system shall comprise the following:

1. Air Termination

2. Down Conductors

3. Joints and bonds

4. Earth Termination

5. Test Links

Air Termination

The conductors for air terminations shall comprise of 25 mm x 3 mm aluminium tape securely fixed in place to the building structure with the appropriate saddles.

Whenever possible, the horizontal conductors shall be of continuous lengths. Fixings shall be such that under adverse weather conditions, the lightning tapes shall remain firmly fixed in position.

Where saddled to masonry, the fixing screws shall be set in expansion type plugs contained in properly formed holes. Where saddled to roof cladding, the mounting of the lightning tapes shall not damage the integrity of waterproofing of the roof cladding and shall not in any way compromise the warranty of the roof.

All roof conductors shall be secured at intervals not exceeding 500 mm. It is required to ensure that the mounting of the lightning protection tape on the roof structure shall not in any way compromise the warranty of the roof.

The whole air termination system installed over its total route of roof areas shall be electrically continuous.

Provision shall be made with suitable fitting to allow for expansion and contraction of the horizontal conductors.

Provision shall be made with suitable fitting to allow for bonding by others to their exposed metallic equipment.

No galvanic corrosion shall take place between the lightning protection tape and the roof structure. Where possible, a narrow gap shall be maintained between the lightning protection tape and the roof structure. Insulating material shall be inserted at appropriate locations to maintain the narrow gap.

Down Conductors

The conductors shall comprise of 25mm x 3mm aluminium tape securely fixed in place to the building structure with the appropriate saddles down to the test links where applicable. The conductors shall comprise of 25mm x 3mm copper tape from the test link to the lightning pit.

Down conductors for interconnection between roof conductors of discharge device and the earth electrode shall be securely fixed to the building structure with approved method and the support shall not exceed 500 mm intervals.

The conductor routes shall be interfaced with the architectural design and shall be as direct as possible.

Joints and Bonds

All joints shall be securely sound and shall be of low resistance. The crosssectional area of the copper materials used shall not be less than the main conductor (i.e. 25 mm x 3 mm).

Where possible, joints shall be kept as few as possible.

All joints shall be tinned, soldered and double riveted.

Clamp, bolt and screw joints, shall not be used in the lightning protection system except at test or bonding points.

Joining of dissimilar metals shall be with purpose made bimetallic joints.

All structural and steel columns shall be bonded to the rebar of the floor slab to ensure a low resistance path. All bonds shall be by means of purpose made clamps or by welding where possible.

Test Links

Test and junction clamps shall be of phosphor bronze.

A test link shall be provided on each down conductor suitably located for ease of testing and it shall be protected from tampering and vandalism. Test clamp shall be recessed into the wall and shall be housed in an accessible secured stainless steel panel through finishes by to be provided under the Contract.

Tape clamps shall also be provided on roof conductor network and arranged such that all parts of the network can be tested independently.

After installation and completion of testing, all test clamps shall be painted with bituminous paint to prevent corrosion.

Earth Termination

The earth electrode shall be housed inside heavy-duty lightning pit with hinged or chained hot-dipped galvanised lid covers of dimension 300mm x 300mm haunch in concrete. Where electrodes are planted on roadside or pavement, they shall be protected by angle steel reinforced chamber with 10mm thick steel checker plates.

The copper tape connecting the earth electrode and down leads shall be run in 50mm diameter uPVC pipe.

The lightning pit on turf area shall be reinforced with concrete support. For the lightning pit on the turf area, it shall be haunch in concrete. All lightning pits shall be filled with sand.

Earthing rods shall consist of a minimum of 2 nos. 1.8 m length, 16 mm diameter copper bond steel rod.

Testing

The system shall be tested for, resistance to earth of the electrodes and electrical continuity of earthing system. The test results shall be submitted for Authority’s acceptance.

Labels

All lightning pits shall be labelled on reverse-engraved traffolyte plate. The label including the pit number, result and date of testing shall be riveted onto the cover of the lightning pit.

Pipe Work

Unless otherwise specified, only one type of pipe shall be used within any individual pipe length.

Valves shall be installed in horizontal lines with stems either horizontal or vertical. Isolation valves shall be installed at any other points indicated or required for draining, isolation, or sectionalising purposes. Valves shall be installed in such a manner that maintenance access is maintained for all parts requiring service. Control valves shall be provided in water pipes to provide complete regulation of plumbing fixtures and equipment.

All fixtures, hangers, supports and brackets for pipes, trunkings, conduits, trays, equipment etc. shall be of hot dipped galvanised to BS EN ISO 1461.

Bolts and nuts shall be accompanied with washers. All these shall be hot dipped galvanised to BS 7371 : Part 6 or sherardised to BS7371 : Part 8, Class S1.

Water Level Sensors

1. All water level sensors shall be of industrial grade, factory calibrated and complete with the necessary electrical/electronic circuitry.

2. Separate controllers shall be provided for multi-level single probe to avoid single point failure. The controllers shall be integrated with the PMCP.

3. The construction and installation of the sensors shall be such that the sensor operation is not affected by dirt, debris, grease, and etc. within the sump pit.

4. Suitable brackets shall be provided for mounting and securing of the sensors and designed such that the sensors shall not impede sump pit access and the sensors can be easily removed for inspection, servicing and maintenance without entering the sump pit. All brackets shall be of stainless steel of minimum grade 316.

5. All sensors, related components and accessories supplied shall comply with EMC requirements.

6. Multi-Level Single Probe

   The multi-level single probe shall be of the single hanging rod type with multiple sensors. The proposed multi-level single probe shall be readily available without any modification required. Combining multiple rods to form a single probe is not acceptable.

   Sensors at different levels shall be provided to correspond with the required depths of water to energise relevant controls to operate the pump and alarm signal.

   Each sensor shall have individual sensing circuit and controller for each level and shall be stainless steel constructed.

   The construction of the probe shall prevent water ingress into the sensor unit to the internal electrical components.

   The multi-level single probe shall have a minimum operating life span of 10 years for use in the intended environment and constructed to IP65 rating.

   The multi-level single probe shall have an operating temperature range of 0 to 40°C.

   Suitable brackets of stainless steel of minimum grade 316 shall be provided to prevent lateral movement of the probe within the sump pit and provided with wiper for probe clearing purpose.

   The multi-level single probe shall not be installed in a stagnant corner where grease and debris may collect and shall be installed with sufficient clearance from any surface to prevent tangling. The bottom of the probe shall be above the minimum pumping level of the sump pit.

Sewage Ejector Pumping System

Sewage ejector pumps shall be of the duplex non-clogging type suitable for handling raw sewage. A minimum of two pumps (duty/standby) and an ejector tank shall be provided for each sewage ejector pumping system. Each pump shall be designed for 2 times the peak sewage/wastewater inflow generated. A sewage sump pump shall be provided in the sump pit and connected to the sewage ejector pumping main for containment of over spillage of sewage from ejector tank.

All ejector pumps with motor sizes larger than 7.5 KW shall be provided with a moisture detector with alarm signal/light connected to the pump control panel.

Operation shall be automatic and controlled by multi-level single probe. If the level continues to rise after starting the duty pump the standby pump shall be started. Provide lead/lag selector switch, hour run meters for each pump and high level alarm. Gates valves shall be provided on the suction, discharge sides of the pump and before inlet to ejector tank. Discharge pipe work of minimum 100mm diameter shall consist of check valve of single flap type or ball type.

The pump shall be designed to cater for no more than 10 starts/stops per hour. However, the motor starter shall be sized to 15 starts/stops per hour.

All fixtures, hangers, supports, brackets, guide rails, chains, bolts, nuts and all related accessories in the pumped drainage system shall be of stainless steel.

The layout shall be such as to facilitate easy removal and replacement of pumps. Lifting facilities (e.g., overhead runway beam, eye bolt etc.) and equipment shall be provided to enable easy lifting of the tanks/pumps. Adequate removable chain blocks shall be provided.

Pumped Drainage System

The drainage pumped system shall consist of duty and standby pumps, water level sensors, electrical and control wiring/system, all associated pipe work, fittings and accessories. The system shall also include one smaller submersible drainage pump, which serve to dewater the sump pit for maintenance purposes, where applicable.

Drainage pumps shall be of vertical centrifugal submersible type, capable of handling and pumping wastewater with solid fibrous material, heavy sludge and other matters found in drainage and storm water applications. Installation of the pumps to the discharge connection shall be the result of a simple linear downward motion of the pumps guided by two guide-rails. The entire weight of the pump/motor unit shall be borne by the pump discharge elbow. No portion of the pump/motor unit shall bear on the sump floor directly or on a sump floor mounted stand. The pumps shall be easily removable for inspection or service and maintenance, requiring no bolts, nuts or other fastenings to be disconnected.

The pump shall be designed to cater for no more than 10 start/stop per hour. However, the motor starter shall be sized to 15 starts/stops per hour. The design Pump Capacity, Qp shall be a minimum of Qp = 2Qin (total inflow) and ensure that the velocity of water in the discharge pipes is between 1.0m/s and 2.4m/s. Discharge pipe shall have a minimum diameter of 80mm.

Check valve of single flap type or ball type and a gate valve shall be provided on the discharge main of every pump. They shall be located above the sump such that they are accessible without the need to enter the sump and after removal of the access cover.

All fixtures, hangers, supports, brackets, guide rails, chains, bolts, nuts and all related accessories in the pumped drainage system shall be of stainless steel.

The layout shall be such as to facilitate easy removal and replacement of pumps without entering the sump. Lifting facilities (e.g., overhead runway beam, eye bolt etc.) and equipment shall be provided to enable easy lifting of the pumps. Adequate automatic mechanisms (motors) shall be provided for lifting equipment in three X-Y-Z axis to facilitate the pumps removal for maintenance and servicing purpose to the nearest loading/unloading bay within the plantroom.

For each sump pump, a control panel shall be placed at a convenient, easily accessible location and shall be constructed with a waterproof type enclosure.

Multi-level single probe for the pump controls and water level monitoring shall be provided as follows:

1. Redundant High water level alarm

2. High water level alarm

3. Redundant Standby Pump Start Level

4. Standby Pump Start Level

5. Redundant Duty Pump Start Level

6. Duty Pump Start Level

7. Redundant All Pumps Stop Level

8. All Pumps Stop Level

Control of the pump shall be carried out by the following methods:

1. Automatic operation by means of multi-level single probe.

2. Manual operation by means of start/stop push buttons at the PMCP, emergency stop buttons and bypass the water level sensors during manual mode of operation.

3. Automatic changeover of duty and standby pumps during each cycle of operation. This is to enable even distribution of wear and tear of the pumps.

Multi-level single probe at different levels shall be provided to correspond with the required depths of water to energise relevant controls to operate the pump and/or raise the alarm.

The audible and visible indications for the system on the PMCP shall consist of the following:

1. Red ‘High Water Level’ alarm indicator with audible buzzer

2. Red ‘Pump Trip’ alarm indicator with audible buzzer

3. Green ‘Pump Run’ indicators

4. Amber ‘Pump Stop’ indicators

5. White ‘Pump Supply Healthy’ indicator

6. White ‘Incoming Supply’ all white indicators, labelled L1, L2, and L3

7. White ‘Outgoing Supply’ all white indicators, labelled L1, L2, and L3

8. Amber ‘Manual / Auto’ status indicator

Pump Motor Control Panel

The pump motor control panel (PMCP) shall be of front access cubicle type of dust and vermin proof construction and is adequately ventilated. It shall be fabricated from 2mm thick sheet steel, pressed or rolled to the shape required with all necessary stiffeners, supports and return edges. All joints shall be neatly welded and finished flush. Nuts, bolts, washers, etc. shall be cadmium plated or sherardised.

The panels shall be finished with high quality enamel. A minimum of two undercoats applied, each built-up and flattened separately. The final coat shall be of an accepted gloss finish and sufficient body given to the paint films so that the final appearance of the finished units is entirely free from blemishes, undulations, foreign inclusions, scratches, patterning or any defects whatsoever.

The door of each control panel shall be furnished with a key-lock under a master key for all motor control panels installed. Cylinder locks shall be used. Three sets of keys shall be provided.

Interface compartment incorporating properly labelled terminal block shall be provided for connections to the Interface Terminal Board (ITB). The control cables shall be properly terminated in the ITB.

The PMCP enclosure shall be designed to IP 55.

The isolator shall isolate the linkage between the pump and motor control panel. The isolator shall be of IP 55.

Motor Starter and Motor

Starters for motors up to 5 kW shall have thermally operated overload units incorporating single phasing protection and ambient temperature compensation with under voltage release facilities. Motors over 5kW shall have thermistors fitted to operate the under voltage release and the necessary control units shall be supplied for these starters.

Each starter shall be complete with overload protection incorporating the following features:

1. Overload protection in each phase supply.

2. Adjustable over the range of 80 percent to 120 percent full load.

3. Manual reset.

Motor starters shall generally be of the following types:

1. Motors rated up to and including 2.2 kW - Direct-on-line (DOL) starters

2. Motors rated above 2.2 kW up to and including 11 kW - Star-Delta starters

3. Motors rated above 11 kW - Auto-transformer starters or other reduced voltage starters subject to Authority’s approval.

All motors, unless otherwise specified on the Drawings or in this Specification, shall be totally enclosed fan cooled (TEFC), squirrel cage induction type conforming to either IEC 34-1 and IEC 85 or BS 5000 and BS 2757 with minimum class F insulation. All varnishes and impregnate used shall be inorganic and suitable for tropical service. Bearings shall be so selected for its duty and shall be housed in a dust tight enclosure with efficient shaft seals to prevent dust ingress and escape of grease, and be equipped with grease nipples and relief plugs. Terminal boxes shall be of cast iron and be provided with glands drilled and taped to accept conduits. Terminal blocks shall be of high quality insulating materials and be capable to support incoming cables.

All motors shall be so selected to have at least 120% of the power rating above the designed duty point. It shall also be able to operate with a power factor of not less than 0.85 at full load, otherwise, power factor correction capacitors shall be provided.

Motors shall be capable of operating continuously at rated output at any frequency between 48 and 52 Hz and at voltage within +/-10 percent of the nominal value.

Motors shall be tropicalised to BS 1156 with minimum 1 mega-ohm insulation resistance.

All motors shall be supplied complete with cable termination boxes and mounting bolts.

Single-phase motors shall be either repulsion or capacitor start and induction run. Motors rated 1 KW and above shall be operated by three-phase supply.

All motors shall be protected and a detection and tripping device shall be provided for as follows:

Special Requirement for Motor of Sump Pumps

The motor shall be housed in an air filled watertight chamber enclosure rated IP 68. The stator shall be dipped and baked three times in Class F varnish and shall be heat sink fitted into the stator housing. The use of bolts, pins or other fastening devices requiring penetration of the stator housing is not acceptable. The motor shall be specifically designed for submersible pump usage and designed for continuous duty pumping media of up to 400oC (1040 oF). The motor should be designed for 15 starts/stops per hour.

The pump capacity of 7.5 KW and above shall have thermal switches embedded in the stator lead coils to monitor the temperature of each phase winding. These thermal switches shall be set to open at 1250 oC and shall be used in conjunction with and supplemental to external motor overload protection. Should high temperature occur, the thermal switches should open, stop the motor and activate alarm.

The motor shall have a voltage tolerance of plus or minus 10%. The motor shall be designed for operation up to 400 oC (1040 oF) ambient and with an average temperature rise of the stator windings not to exceed 800 oC. A performance chart shall be provided showing curves for torque, current, power factor, input/output KW and efficiency. This chart shall also include data on starting and no-load characteristics.

Water leakage/ moisture sensors shall be provided to detect liquid/ moisture in the motor housing. Use of voltage sensitive solid state sensors shall not be allowed.

The junction chamber shall contain two distinct and separate terminal boards. One terminal board shall be used for the connection of the pilot sensor leads with the pilot sensor cable. A separate terminal board shall be utilized for the line power connection to the motor stator leads. This power terminal board shall use threaded compression type binding posts to connect the cable conductors and motor stator leads.

The power terminal board shall separate and seal the junction chamber from the stator housing. The use of wire nuts or crimping type connectors is not acceptable. The cable entry junction chamber and motor shall be separated by feed through type terminal board of non-hygroscopic material, which shall isolate the stator housing from foreign material gaining access through the pump top.

The power cable shall be sized to the IEC Standards and shall be of sufficient length to reach the junction box without the need of any slices. The cables used shall be suitable for marine environment. The outer jacket of the cable shall be of oil resistant chloroprene rubber with low water absorption, and with mechanical flexibility to withstand the pressure at the cable entry. The motor and cable shall be capable of continuous submergence without loss of watertight integrity to a depth of at least 20m.

The cable entry seal design shall preclude specific torque requirements to ensure a watertight and submersible seal. The cable entry shall consist of dual cylindrical elastomer sleeves, flanked by washers, all having a close tolerance fit against the cable and the cable entry. The sleeves shall be compressed by the cable entry unit, thus providing a strain relief function.

The assembly shall permit easy changing of the cable. Epoxies, silicones, or other secondary sealing systems shall not be considered acceptable. Moisture /leakage sensors shall be incorporated to detect any leakage of liquid into the stator housing or into the cable entry of the pump and linked to the pump control and monitoring unit(s). Use of voltage sensitive solid state sensors shall not be allowed.

Design Requirements

Unless otherwise stated, this technical specification defines the requirements for the design, supply, delivery, installation, testing and commissioning of machine roomless lifts.

The lift shall comply strictly with all statutory regulations, by-laws and orders currently in force. Unless otherwise stated herein, the lift shall comply with the latest edition of SS 550 and Code on Accessibility in the Built Environment.

Lifts for Pedestrian Overhead Bridges and Pedestrian Underpass shall have a with minimum rated load (capacity) of 750kg shall have both car and landing entrance clear opening width and height not less than 900mm and 2100mm respectively. Lifts for Bus Interchanges and bicycle lifts for POB with minimum rated load (capacity) of 1250kg shall have both car and landing entrance clear opening width and height not less than 1100mm and 2100mm respectively. The rated speed shall be 1.0m/s in either direction for all lifts. The lift car shall be designed as squarish as possible.

Each lift shall have its own traction drive machine, which makes use of sheaves and ropes (or equivalent). The roping ratio shall be kept to maximum 2:1. Unless otherwise specified, machine roomless lift type shall be used.

The design life of the lifts shall be a minimum of 20 years with the inspections and maintenance being carried out in accordance with the supplier’s Operation and Maintenance Manuals and as accepted by the Authority.

The lift shall be of proven design with track record of at least 5 years.

All electrical equipment and control panels that are installed in the lift hoistway/lift motor room/lift landings and the car top safety switches shall be rated to a minimum of IP 21 except for the door locks which, shall be at least of IP 42 or IP2X with cover to prevent water ingress.

The car operating panels (COP) and the car call buttons shall be ergonomically designed and of robust construction to the Authority’s acceptance. The COP shall be supplied and flush mounted on the front return panel of each lift car entrance or the side wall panel of the lift car.

A two-panel centre-opening door system shall be provided. The door shall be of at least 1.5mm thick stainless steel, hairline (grade 304). A door vision panel, in compliance with SS 550 shall be included.

The lift car shall be ventilated to a minimum of 80 air changes per hour. The noise from the fan measured at a distance of 1 metre away within the lift car shall not exceed 60 dbA. The grille for the fans shall be designed to provide good ventilation within the lift car to achieve an average air velocity of at least 0.8m/s at the car centre and perimeter 1.2m high from the car floor.

The minimum illumination level at the floor of the lift car shall be 150 lux using LED lights located at the car ceiling.

The finishes and ceiling details of the lift car shall be co-ordinated and subjected to the Authority’s acceptance. If specified, a mock-up of the lift car, lift entrance and landing equipment shall be built to assess and verify the adequacy and quality of the finishes.

The equipment shall comply with the EMC emissions and immunity tests in accordance with appropriate international standards for equipment operation in similar environment or as specified by the Authority.

A key switch that facilitates the shutting down of the lift during non-revenue hours shall be provided and recessed below the hall call button at the ground level. The lift car shall park at the designated level with the lift doors remained closed, lights and fans switched off, and all hall calls shall be ignored except the alarm bell button, intercom button and doors opening button on the COP. The Information Display Panel shall also display a suitable message indicating that the lift is no longer in operation. The keys provided should be the same for all lifts provided at POBs.

Safety Requirements

A battery operated Automatic Rescue Device (ARD) shall be provided to bring the lift car to the nearest landing in the event of power failure. During this operation all safety features of the lift shall remain operational. The rescue time of the device from the time of power failure to the time the doors fully open at the nearest landing shall not exceed 2 minutes. The landing accuracy shall be ± 10.0 mm.

The ARD shall not modify the lift design and all its original safety features and shall not in any way affect the performance of the lift.

The car door shall not open under any conditions (including power failure) whilst the car is in motion or stalled outside the unlocking zone of a landing. The car and landing doors shall only be opened in the unlocking zone of a landing with a landing key of an approved type.

An overload device shall operate when the car load exceeds its rated load. When activated, the lift shall not move, and a warning buzzer and an illuminated "Overload" sign shall be activated. The “Overload” sign shall be incorporated in the car position indicator.

A control panel shall be fitted on the top of the lift car for maintenance purpose. The design of the control panel shall comply with the following requirements and prevent the lift car from being operated accidentally:

1. It shall not be possible to control the lift car from any other position after the NORMAL/TEST changeover switch has been set to the TEST position. When in the TEST position the UP and DOWN continuous pressure push buttons within this panel shall become operative.

2. The lift car shall only move when all safety devices are in normal and healthy condition.

3. The lift car shall move in either direction only on continuous pressure of the appropriate direction button at a car speed not exceeding 0.25m/s.

4. An emergency mushroom stop switch shall be provided.

5. The control panel shall incorporate a 13A metalclad switch socket outlet and a light fixture with switch. The light fixture shall be permanently installed and adequately protected.

6. Means shall be provided to turn off the power to the door operating device and operate the doors for maintenance and testing purpose.

7. Associated with this control, terminal stop limit switches shall be provided to stop the car from travelling in an upward direction not less than 1.8m from the soffit of the lift hoistway as well as before the car reaches the down final limit switch. When these switches are activated, it shall not stop the car from operating in the opposite direction.

The lift shall have a floor levelling device which shall automatically bring the lift car to stop within ±5mm of the landing floor level for which a stop has been initiated regardless of the load or direction of travel.

Each lift car shall be provided with progressive type safety gear mounted on the lower member of the car frame structure. This safety gear shall be capable of operating only in the downward direction and capable of stopping the car with full load at the tripping speed of the overspeed governor, by gripping the guides and holding the car stationary. The motor circuit shall be opened by a switch on the safety gear before, or at the same time the safety gear is applied. It shall be possible to release the safety gear by raising the lift car without the use of any special tools.

The electrical tripping (machine brake) and mechanical tripping (car safety gear) of the overspeed governor shall occur when the car speed is at a minimum 115% and 120% of the rated speed downwards respectively. An electrically operated safety switch shall be provided to disconnect the power supply to the motor when the governor is activated. Overspeed governors, which are remote re-settable from the controller/EI panel shall be provided. Manual resetting overspeed governor shall only be considered if it is located in the lift pit or in the hoistway whereby the maintenance staff could easily and safely access to mechanically reset the governor.

A phase protection device shall be provided in the controller of each lift to prevent the lift car from moving in the event of phase failure or the phase of the power supply being reversed due to any reason whatsoever. This device, when activated, shall cause a visual indicator to illuminate on the controller, until the fault has been rectified.

Electrically operated proximity detector device(s) shall be installed on the leading edge of the car doors. The device(s) shall create a 3-dimensional zone of protection for at least 1.8m height of the door opening. This zone of detection shall extend a short distance in front of the landing doors. The zone of detection shall move forward as the doors close and the presence of a person, if within this zone, shall activate the detector to stop the closing movement of the doors and re-open them before hitting the person. After a pre-set time interval (which is programmable) the doors shall start to close again in the absence of further interruption. In addition, mechanical safety edge protection shall also be provided to the lift door.

Car and Hall position indicator shall be provided above each car door. The faceplate of the car position indicator shall be made of stainless steel grade 304 hairline-finished. Floor numbers shall be digitally displayed using yellow or light green round or square-dot LEDs panel of not less than 30mm(H) x 600mm(L). There shall be an arrow in motion vividly and dynamically indicating car movement and direction. It shall be capable of displaying scrolling and blinking messages such as, “Out of Service,” “Under Maintenance” etc. The list of messages shall subject to the acceptance by the Authority. The surface of the display unit shall be of non-glare type.

A 2-level detection device, such as float sensors/switches, shall be provided in the lift pit. The 1st sensor shall notify the Operator once the pit is accumulating water, upon reaching the 2nd sensor, the lift shall home to the designated landing and render the lift inoperative. A cut off drain shall be provided across before the entrance level landing of the lifts to prevent water ingress into the lift shaft.

If the PUP or BI is linked to a Fire Command Centre (FCC), a Lift Supervisory Panel or a mimic panel indicating the position of the lifts shall be provided within the FCC. The location and contents of the panel shall be subject to the acceptance of the Authority.

The finishes of the lift car and hall equipment shall be of 1.5mm-hairline stainless steel grade 304, with flooring that commensurate or is similar with the lift lobby. All finishes shall be subject to the acceptance of the Authority.

Cable Requirements

All cables shall comply with the requirements of SS 638 and the EMA regulations and requirements. The main power cable providing the electricity supply to a lift installation shall be at least of FR type.

Flexible flat travelling cables shall be provided and conform to the latest SS 358/EN 50214. It shall be securely clamped at each end so that the weight is not supported by any fixing of the various cores. A total spare of 10 or 10% of the total number of wires used whichever is more and 2 spare shield cables shall be provided per lift.

All cables shall run in galvanised steel conduit or galvanised steel trunking. The steel conduit shall comply with SS100 and BS4568 Part I & II, Class 4. The steel trunking shall comply with SS249. All galvanising of cable support shall be in accordance to BS729 and BS4921.Compression glands for cables shall comply with BS6121. Flexible conduit used shall be enhanced low fire hazard, polyolefin covered galvanised steel conduit. All conduit outlets shall be bushed appropriately. All cable support connections including to all electrical fixtures shall be watertight.

Provisions for People with Special Needs

All lifts provided shall comply with the Code on Accessibility in the Built Environment and the following:

1. An international symbol of access for the disabled shall be permanently and conspicuously displayed at each and every lift landing next to the lift entrance. The size of the symbol and its position shall be subjected to the Authority’s acceptance.

2. Braille notations and raised numerals indicating the floor levels shall be incorporated on each button at COP and the hall call buttons.

3. A recorded voice system for announcing the car position, opening/closing of doors, direction of travel and other messages shall be provided. The system shall be capable of storing not less than 25 recorded messages.

4. All buttons shall be of micro movement/pressure type. The button shall always be illuminated and change colour upon pressing or whenever car call is registered. Floor buttons shall be provided with the floor names on the right side of each button.

5. An intermittent buzzer tone shall be used to inform the passengers throughout the opening and closing of car doors.

6. An audio signal such as beep tone shall be sounded to signal each hall/car call registered.

7. The volume of the buzzer/beep tone shall be adjustable from 60dbA to 70dbA as measured at the centre of the door opening.

8. Blinking light on the emergency bell button shall be clearly visible when it is being activated.

Lift Inter-Communication System

A lift inter-communication system of the simultaneous communication voice activated type shall be provided in each lift.

Master stations shall comprise a receiver set, a transmitter set, a microphone/loudspeaker unit, buzzer, system-on and reset button(s) and systemon indication light. Slave stations shall comprise a transmitter set and a microphone/loudspeaker. All stations shall be equipped with handsets except those slave stations installed inside the lift cars, which shall be of the hands-free type.

A master station shall be supplied and installed in the Passenger Service Office (PSO) (at Bus interchange only) and EI panel. The stations in the EI and PSO shall alternate their role as a master station in the normal lift operation mode and special emergency operation mode (except in the event of power failure) respectively.

A slave station shall be supplied and installed in each lift car. The loudspeaker and microphone unit of the slave station in the lift car shall be concealed in the car-operating panel.

Where the intercom system is not connected to a control centre, a signal shall be sent and latched-on to the Operator through the Building Management System (BMS) when the alarm or intercom button has been depressed for more than a pre-set time.

A lift management, monitoring and fault diagnostic system that will serve the purpose of keeping track historical events to help in the analysis the lift performance when incidents occurred shall be provided subject to the Authority’s acceptance

Design Requirement

This technical specification defines the requirements for the design, supply, delivery, installation, testing and commissioning of escalators.

The escalator shall comply strictly with all statutory regulations, by-laws and orders currently in force. Unless otherwise stated herein, the escalator shall comply with the latest edition of SS 626 and SS 638.

Escalators shall be reversible and capable of continuous operation in both directions for a period of 20 hours a day, seven (7) days a week 365 days per annum.

Escalators shall comply with the requirements of public service escalators as stipulated in SS 626 with a design life of at least 20 years, which requires no major repairs for the first 10 years. Major repairs shall consist of repairs to the steps, track system, step chains, main drive system, traction machines, landing plates and tension carriage due to causes other than those attributable to normal wear and tear.

The escalator shall be of proven design with minimum track record of 5 years.

When provided, escalators traversing in the up and/or down directions may be provided linking all levels of the Pedestrian Overhead Bridge (POB), Pedestrian Underpass (PUP) and Bus Interchange (BI).

Escalators shall be designed for installation and operation at an angle of inclination of 30°.

Operating speeds of the escalators shall be as follows:

The truss shall be supported at both ends and at intermediate points where required with resilient supports and bearing plates. No intermediate support(s) shall be provided for escalators with vertical rise of 6.0m and below. The truss shall be designed to support the dead weight of the escalator plus the passenger load.

Radii of the upper and lower transitional tracks shall be equal to or greater than the following:

*1) Escalator that is contained in a Commuter Facility that connects directly with a transit station.

Step chains shall be of the endless roller type located on both sides of the moving step. The chains shall be provided in matched lengths and be of high quality steel construction incorporating links, pins, bushes, axles and rollers with three pitches between adjacent rollers. All chain pins shall be circlipped. Each step chain shall be provided with an automatic tension device to ensure proper tension under varying load conditions. A method shall be provided to shorten the chain by one step to compensate for chain elongation. The step chain pin pressure of all escalators shall not exceed 20N/mm2.

Steps shall have a tread width of at least 1000mm and 400mm deep and not more than 210mm high. For commercial escalators, three (3) flat steps shall be provided at both upper and lower landings. Four (4) steps shall be provided on both landings for transit escalator.

The step and step chain rollers shall have durable elastomer materials bonded to a metal die case hub. The Shore hardness of the tyre materials shall be 92o ± 3oA when cured. The bond shall have sufficient strength to avoid de-trying under all load conditions. The minimum diameter of the roller and the trailer rollers shall be 75mm. The roller shall have a minimum width of 20mm.

Handrails shall have a service life of at least seven (7) years under the stipulated operating conditions.

Handrails shall have inserts and sliding surfaces of endless loop construction designs, synthetic materials, traction type, with a single, smooth vulcanised joint. The minimum breaking strength of the joint shall be greater than 85% of the minimum breaking strength of the handrail. The hardness of the outer stock shall not be less than Shore 70o 5Ao. Handrail shall be ‘V’ cross section type.

Handrails shall be delivered in protective film and an endless loop with only one factory made vulcanised joint, which shall not be visible on the top surface. The endless loop handrail shall be able to be installed into the handrail drive system without the need to be cut or re-vulcanised on site.

The equipment shall comply with the EMC emissions and immunity tests in accordance with appropriate international standards for equipment operation in similar environment or as specified by the Authority.

All electrical equipment supplied and installed shall have at least IP 55 Class protection rating.

An automatic lubrication system shall lubricate the main drive chains, step chains and handrail drive chains efficiently and economically.

The lower pit of all escalators shall be provided with a detection device, such as float sensor/switch, to stop the escalators if the pit is flooded. A drainage system by means of gravity shall be provided at the lower landing pit to discharge water that may be accumulated due to rain or washing. Alternatively, a sump and pump of suitable capacity shall be provided at the lower landing, to pump out water automatically. All piping shall have a minimum 50mm diameter with suitable wire gauze at the ends. The escalator drip pan at the lower landing shall also be removable for maintenance and cleaning of the discharge points. The discharge point(s) shall come with a grease inceptor(s) complying with ENV’s requirements.

A weatherproof 13A switch socket outlet and protected permanent lighting shall be provided in the upper, lower landing pits and at the controller closet of the escalator.

Comb lights of minimum lighting levels of 50 lux, shall be provided. Comb lights of PUP escalators shall be connected to an UPS unit situated in the escalator controller (ECP) closet whereas for BI, the comb lights shall be connected to the bus interchange EPS/UPS supply. Strip LED lightings integrated with combplate shall also be provided, and it shall be able to alter between green and red light automatically in accordance to the escalator travel direction.

Voice announcement system shall be provided for each escalator. The voice announcement system shall allow broadcasting of safety messages which shall be clear and audible at the escalator landings. The broadcast of messages shall only be activated when there are passengers approaching the escalators. For escalators that are located close to each other, the announcement of the messages shall be synchronised. The controller for voice announcement system shall be located inside the Escalator Control Panel (ECP) closet.

A status/fault logging system shall be provided and be able to record and display the status/fault codes in a last in first out sequence.

A display unit (with a protective cover) indicating the fault code shall be installed at an easily accessible and protected location on the handrail decking at the landing nearest to the control panel.

Faults that do not require the attendance of the maintenance staff shall be easily identified to enable the operator to reset the escalator.

Earth Leakage Relay Protection shall be provided.

Additional requirements for Transit escalators:

1. The track system shall be provided with counter guards throughout the entire step band to prevent the uplifting of the steps and step chain rollers. For areas whereby counter guards cannot be installed, step hooks shall be provided.

2. The tracks wearing surfaces shall be a minimum 5mm thickness. This requirement is applicable to the step roller track and the chain roller track for both the passenger side and the return side. The wearing surface of the return track can be of 3mm thick subject to design reviews and acceptance by the Authority.

Escalators installed at POBs shall be of outdoor type and suitable for use in local environmental conditions. The designs of these escalators shall be submitted to the Authority to demonstrate its suitability of use in the installation.

Energy Conservation Requirements

An energy saving device to conserve energy by the reduction of speed (standby speed) when the escalator/moving walk is operated at no load shall be provided. During an extended period of no load, the energy saving device shall also be able to reduce the speed from standby speed to stop (standby stop). Provision shall be made to allow the escalator/moving walk to be operated without this energy saving device. In any operating mode the device must not cause abrupt change in speed or jerk. The device shall not cause harmonic feedback to the power supply system or emit electromagnetic interference to other systems. Star-delta operating system shall be provided for the escalator to be operated without the energy saving device.

When the escalator is operating at no load, the quantum of energy saved with this device should not be less than 30% as compared to operation without this device.

Piezo contact mat mounted underneath the landing floor plate and radar/photo sensor installed at the newels end shall be used as the detection means for energy saving device. Other means of detection may be considered.

Data and calculation shall be provided to substantiate energy savings on various escalator loadings.

Machine Pits and Closets

Controllers and other accessories such as incoming isolators, ITB's and switches shall be housed outside the truss, in wall recess/closet below the escalator or adjacent to the lower/upper landings. Location of the controller shall be kept within 10m of the escalator.

The escalator/moving walk controller shall be made of an IP54 spray painted, 1.5mm thick galvanised sheet metal cabinet with hinged door, lockable with a dedicated key. The size of the controller cabinet shall be suitable for mounting into a wall recess/closet that will also be housing the incoming power supply isolator and ITB's. The wall recess/closet shall come with lockable full-louvered doors and the dimensions shall not be greater than 2700mm (wide) x 2400mm (high) x 750mm (deep).

Provision shall be made in the controller to ensure that the maximum temperature within the controller shall not exceed 38oC during operation.

Escalator landings shall be provided with easily openable, hinged landing plates suitable for access to the drive mechanism. Landing plates and the combplates shall have a non slip high wear resistant, stainless steel 316 surface that will facilitate sectional replacement. Lifting handles shall be provided to facilitate opening of the landing plate. Means, such as hydraulic/pneumatic cylinders, shall be provided so that the force required to lift the floorplate is not more than 200N. All escalator landing plates shall be individually supported without relying on the adjacent landing plates.

Corrosion resistant, oil tight drip pans of galvanised sheet of not less than 2.0mm thick shall be provided for the entire length of the truss and shall be of sufficient rigidity to support the weight of workmen. Drip pans shall be designed to collect and drain off both oil from the machines and water, which may enter through the landings, floor plates, exposed portions of escalators and moving walks or from fire suppression systems. All gaps shall be properly sealed to prevent leakage. Means shall be provided to drain and collect any excess lubricating oil from the chains to removable container(s) at the lower landing machine pit for easy removal and cleaning.

Cable Requirements

All cables used except those within enclosed closet or trunking/galvanised steel conduit shall be of the fire resistant/retardant type.

All cables shall run in galvanised steel conduit or galvanised steel trunking. The steel conduit shall comply with SS100 and BS4568 Part I & II, Class 4. The steel trunking shall comply with SS249. All galvanising of cable support shall be in accordance to BS729 and BS4921.Compression glands for cables shall comply with BS6121. Flexible conduit used shall be enhanced low fire hazard, polyolefin covered galvanised steel conduit. All conduit outlets shall be bushed appropriately. All cable support connections including to all electrical fixtures shall be watertight.

Safety Requirements

Three sides of each step/pallet shall be provided with fluorescent yellow demarcation lines of at least 20mm wide, made of one homogenous polymer material and do not emit toxic gas when burnt. The groove at the step nose shall be fluorescent yellow powder-coated with at least 20mm wide. Skirt brush guards of accepted design complying with SS626 shall be provided along the skirt panel to enhance passenger safety.

Emergency Stop Switch of the recessed, momentary pressure and emergency push button stop type with extended sleeve to protect against accidental operation shall be provided on each escalator and moving walk. A minimum of one switch shall be located in conspicuous and accessible positions at the incline section/treadway as well as at the newel at both ends of the escalator/ moving walk. The distance between the switches shall not exceed 15m and 40m for escalators and moving walks respectively. The operation of any one of emergency stop switches shall disconnect electrical power to the drive mechanism and activate the brake(s). It shall not be possible to re-start the drive mechanism by the use of these switches. To prevent vandalism, a transparent cover marked ‘STOP’ shall be provided over these buttons. A self-resetting, audible warning alarm/bell shall be activated once the cover is lifted. The design of these covers shall be integrated with the escalator and subject to the acceptance of the Authority.

Step and Skirt Safety Detection Devices shall be provided in escalator skirting panels in close proximity to the upper and lower comb plate tips, on the track system at the upper and lower curves and at 7.5m intervals along the incline of each escalator. Electrical power to the drive mechanism shall be disconnected and the brake(s) applied should any one of these devices be activated due to the skirt panels being forced away from the steps.

A detection device shall be provided to stop the escalator/moving walk in the event of unintentional reversal of direction from the pre-set direction of travel. The detection device shall directly detect the direction of the moving steps/step chains instead of indirect means such as directions of the motor/gear shaft or coupling.

A missing step detection device shall be provided, which shall stop the escalator before the step opening appears on the passenger side of the escalator.

Directional traffic signs shall be provided on the right side of the newel at both landings of each stainless steel balustrade escalator/moving walk. For glass balustrades, traffic signs shall be provided on the right and left inner deckings at both landings of each escalator/moving walk. The traffic signs shall be LED type indicating a green arrow for “Enter”, and a white bar against red back ground for “No Entry” blinking sign.

Corrosion Resistance And Material Requirements

Escalator components shall be protected against corrosion as follows:

Pipe Works

Pipework Materials

Pipework specification for the various services shall be in accordance with the Table 12.1.1.

Table 12.1.1 Pipework Materials

Sheet Metal Ductwork and Accessories

All sheet metal ducting shall be constructed of hot-dipped galvanised steel sheet and conformed to SMACNA or BESA DW/144 Specification for Sheet Metal Ductwork, Low, Medium and High Pressure/ Velocity/ Air Systems, UK. Application and usage of ductwork accessories such as flexible joints, flanged joints, sealants, gaskets, hangers & supports shall also comply with SMACNA or BESA DW/144. The galvanised steel sheet shall comply with ASTM A1046/A1046M or equivalent and having self-healing properties that protects the cut-end surfaces from corrosion.

Smoke purging system ductwork including the sealant, flexible connection, gasket and accessories, shall be constructed to high velocity/pressure classification of SMACNA or DW/144 and shall be suitable for high temperature operation at a temperature of 250oC for at least 2 hours.

Ductwork Insulation

All air-conditioning system supply air and return air ductwork shall be thermally insulated. External thermal insulation shall also be applied even though these ducts are provided with acoustic internal lining.

All fresh air, exhaust air, transfer air ducts within an air- conditioned area and all air-conditioning return air ductworks shall be externally insulated with minimum 25mm thick, minimum 32 kg/m3 density semi-rigid fibre glass board wrapped with a factory applied aluminium vapour barrier jacketing.

All air conditioning supply ductwork shall be externally insulated with minimum 50 mm thick, minimum 32 kg/m3 density semi-rigid fibre glass board wrapped with a factory applied aluminium vapour barrier jacketing.

All air conditioning ductworks/pre-treated fresh air ductworks exposed to the weather shall be insulated with minimum 50mm thick rigid closed cell, phenolic foam (fire retardant type) insulation and minimum 15mm thick cement plaster finished on chicken wire mesh with colour painting.

Pipe work Insulation

All refrigerant and condensate pipeworks shall be insulated with a fire retardant, self-extinguishing, CFC free (ozone depletion potential of zero), flexible, black, closed cell, elastomeric nitrile rubber insulation with Class 1 surface flame spread to BS476 Part 7 1997 and Fire Propagation (Total Index of Performance (1) less than 12 and Sub Index (i) less than 6) to BS476 Part 6 1989. The insulation shall be encased in a metal jacket or trunking even though they are installed inside the ceiling void and concealed space.

Thickness of the pipework insulation shall be as shown in Table 12.4.1.

Table 12.4.1 Pipework Insulation Thickness

Air Filters

Provision of air filters for ECS shall comply with SS 554 requirements.

PEU shall be provided with washable air filters manufactured from anti-fungal material for primary filtration. Filters shall be rigid-frame and readily removed/ replaced.

Air Curtain

The air curtain shall be provided with either wall-hang or ceiling suspended mounting and interlock with the FCU / AHU.

Air curtain shall have 2-speed fan (high, low and off) with a push-button switch provided in the unit.

Air deflection vents/louvers shall be provided for adjusting the airflow direction.

The effective velocity at the design point shall not be less than 2 m/s.

1 no. 13A switch socket outlet each for air curtain above automatic sliding door.

Fans

The fans shall deliver the air volumes and pressures as specified when tested to the ANSI/AMCA standard 210 or equivalent ISO and EN standards.

The fans sound power levels shall be detailed in octave bands from tests carried out in accordance with ANSI/AMCA standard 300 or equivalent ISO and EN standards.

Fans with airflow rate larger than 1 m³/s shall be selected with a combined fan and motor efficiency of minimum 70%. The combined fan and motor efficiency shall be calculated using the following formula:

The fans shall be statically and dynamically balanced and factory tested in accordance with ANSI/AMCA 204.

Terminal box for the motor cables shall be made of galvanised steel and mounted on the fan casing with sufficient space for cable entry and termination. The terminal box cover shall be provided with gaskets to prevent ingress of dirt and moisture. Stud type terminals shall be provided for termination of cables.

Motors for fans shall be of minimum Class F insulation to IEC 60034 and shall be rated for continuous operation in ambient temperature of 40ºC and in humid air conditions up to 100% relative humidity.

Flexible connectors used for connection of ducts to fans shall have same temperature and fire rating as that of the associated fan and ductwork system.

The fans shall be supported by spring type vibration isolators as recommended by the manufacturer to prevent transmission of vibration to the structure.

The fans accessories such as flanges, hanger brackets, bell mouths, etc. shall be provided by the fan manufacturer.

All necessary brackets, hangers and threaded components, including bolts, nuts, inserts and washers shall be sheradised mild steel to BS EN 13811 with Class 45 coating or hot-dip galvanized steel to BS EN ISO 1461. Bolts, nuts, washers, fittings, flanges, etc. of different materials shall be suitably insulated to prevent galvanic corrosion.

An air-tight access door shall be provided on the fan housing or the adjacent ductwork to allow convenient maintenance access for inspection or cleaning of the fan impeller and motor.

Support beams, support legs, platforms, hangers, anchor bolts and vibration isolators for the proper installation of equipment and maintenance of equipment shall be designed. Sufficient numbers of permanently attached lifting eyes for onsite assembly and disassembly of fan units shall be provided.

Fans for smoke control systems shall be suitable for operation in atmosphere of 250ºC for 2 hours and shall also conform to the following:

1. Motors shall have minimum Class H insulation to IEC 60034.

2. Motor winding shall be insulated to permit the motor operation at the design conditions for a period of not less than two hours in an air temperature of 250ºC.

3. All finishes shall be factory-applied and shall be certified by the respective manufacturer that the finishing materials are capable of withstanding exposure to an air temperature of 250ºC for a period of not less than two hours without producing smoke or toxic fumes.

Air-cooled Split-type Variable Refrigerant Flow (VRF) Air Conditioning Units

Air-cooled split-type air-conditioning units shall consist of one or more indoor package evaporator units (PEUs) and an outdoor package condensing unit (PCU), control and the inter-connection wiring, piping and accessories.

Air-cooled variable refrigerant flow (VRF) air-conditioning units shall consist of multiple PEUs connected to one PCU, control and the inter-connection wiring, piping and accessories.

Capacity of the air-conditioning units selected shall comply with both the minimum sensible and total cooling capacities specified.

PEUs installed inside electrical and electronic rooms shall be of ducted type and provided with secondary drain pans. The secondary drain pans shall be connected to the condensate drainpipe. Avoid locating PEUs and their associated pipe connections, joints, valves, refrigerant pipes, condensate drain pipes, etc. directly above electrical/electronic equipment. Refrigerant pipe runs within the equipment rooms shall also be minimised to reduce the risks of water damage to the electrical/electronic equipment. If unavoidable, drip trays/pans shall be provided for refrigerant pipes or wet pipes which are routed above electrical/electronic equipment.If unavoidable, drip trays/pans shall be provided for refrigerant pipes or wet pipes which are routed above electrical/electronic equipment.

Secondary drain pans shall be constructed of stainless steel sheets and epoxy coated and provided with adequate fire retardant closed cell foam type insulation sandwiched in between the stainless steel sheets. The secondary drain pan shall cover the entire PEU and all associated valves/fittings at the inlet and outlet pipe connections.

Air-conditioning units shall be tested and rated in accordance with AHRI 210. They shall also comply with the applicable provisions of AHRI and SS 530. The efficiency of the air-conditioning units shall be 0.9kW/RT or better.

When sizing the refrigerant pipes, the piping length between the PEU(s) and PCU(s) shall be take into consideration. The number of bends shall not exceed the manufacturer’s recommendation.

Refrigerant for the air-conditioning units shall have ozone depletion potential (ODP) of zero or with a global warming potential (GWP) of less than 100

Units shall be entirely assembled, completely piped, wired, charged and factory tested.

All components shall be dehydrated, sealed and shipped with holding charge/refrigerant.

Equipment shall be properly stored, well covered and protected until ready for installation.

Equipment shall be protected from either mechanical or corrosive damage during storage and installation.

All necessary supporting steelworks required for the proper installation of the units shall be provided. All supporting steelwork including bolts, nuts, washers and screws shall be galvanized to BS EN ISO 1461.

Air-conditioning units shall generate minimum vibration and noise during operation. Additional vibration isolators and sound attenuators shall be provided by the Contractor without extra cost if noise and vibration are found excessive and not within the acceptable limits.

All acoustical and thermal insulation including facings and adhesive shall be non combustible with a surface flame spread rating of not lower than Class O and shall comply with the latest requirements of the local fire regulations.

All cold parts e.g. accumulator, air dryer, pipes etc. shall be insulated to prevent condensation occurring and wetting of the floor.

The manufacturer's name, serial and model number and data of manufacture shall be securely attached to each unit.

The equipment and appurtenance shall fit into the space provided and shall be easily serviceable.

After completion of testing of piping and accessories, the system shall be charged with refrigerant in accordance with the manufacturer’s recommendation.

For system with multiple PEU(s), isolating valves shall be provided on the refrigerant piping for isolation of individual PEU.

Where PEUs share a common condensate drain pipe, an isolation valve shall be provided near to each PEU drain outlet to facilitate isolation for maintenance. Not more than three PEUs shall be connected to a common drain pipes.

For brazing of refrigerant pipework, nitrogen gas shall be continuously charged into the pipe from one end and discharged from the other end of the pipe. This is to prevent oxidation occurring on the internal surface of the pipe during brazing.

Noise level for the condensing unit shall not exceed 55dBA when measured at 1m in free field condition in any direction and shall not exceed NEA noise level requirement.

The sound pressure level at 1m away from the PEU shall not exceed 54dBA at its highest fan speed.

The Fire Sprinkler System shall comprise the following

1. One sprinkler jockey pump and two main sprinkler pumps.

2. Sprinklers, pipework, valves, fittings and etc.

3. Electrical control panels, wirings, accessories and etc.

The sprinkler control valve set(s), sprinkler pumps and control panel shall be housed in the fire pump room.

Sprinkler Heads

Tools shall also be provided to facilitate removal of sprinkler heads

Sprinklers shall be of FM approved or UL listed.

Sprinkler heads shall be glass bulb type with temperature rating of 68ºC and shall be colour coded according to the approved standards. In areas of above normal temperature, high temperature sprinklers suitable for the temperature condition shall be provided in accordance with SS CP 52.

Sprinklers shall be of conventional pattern designed to produce a spherical type of discharge with a portion of water being thrown upwards to the ceiling. Sprinkler shall be designed with universal deflector enabling the sprinkler to be installed in either the upright or pendant position. Where applicable, the sprinkler heads shall be fitted with water shields and/or protective guards of an approved type.

Exposed sprinklers for areas with false ceiling such as shops, offices, corridors etc. shall be designed for use with pipework within the ceiling space and shall be installed complete with ceiling plate (rosette) flush to the false ceiling. Sprinklers shall be of standard chrome finish. Ceiling plates shall be chrome plated or finish to the acceptance of the Authority.

Protective guards of approved type shall be fitted to each sprinkler head in the area where sprinklers are located less than 2 metres above floor level and where they are liable to accidental and mechanical damage. Sprinkler heads installed in the escalator pits shall be fitted with protective guards. Where applicable or required, these sprinkler heads shall be of the side throw type.

The Contractor shall ensure that the regulations in SS CP52, are complied within his installation with regards to maximum and minimum spacing between sprinklers on range pipes and between adjacent rows of sprinklers, maximum distance of sprinklers from walls or partitions, maximum distance of sprinkler heads below ceiling or roofs, minimum horizontal distance of sprinklers from beams etc.

Easily accessible flushing facilities shall be provided for each zone to discharge to the nearest drainage outlet.

Sprinkler Control Valve Set, Electrically Supervised Gate Valve and Accessories

Sprinkler control valves shall be supplied and installed. Each sprinkler control valve set shall comprise the following:

1. Main stop valve

2. Alarm valve

3. Alarm devices including water motor alarm gong, pressure switch, etc.

4. Facilities for water proving testing to suit the SCDF and SS CP52 requirements

5. Glycerine-filled pressure gauges to indicate ‘upstream’ and ‘downstream’ system pressures f) Electrically - supervised device for valve closures.

6. Other equipment as necessary

The stop valves must be ‘right handed' and the controlling wheels shall be clearly marked showing in which direction the wheels are to be turned to close the valves. There must be individual indicators which shall show whether the respective valves are open or shut. The stop valves controlling water supplies shall be secured open by individual pad-locked straps.

The alarm valve shall be fixed on the main supply pipe immediately above the main stop valves. The alarm valves shall be of an approved type and shall have all necessary connections of the correct size for connections to glycerine-filled pressure gauges, water motor alarm, combined drain and test valve etc.

The electrically supervised gate valves shall be with integral limit switches.

Alarm Gong

Water motor alarms of approved type shall be supplied and fitted close to the sprinkler control valve set. Each water motor alarm shall comprise a fire alarm gong with a turbine to operate whenever the alarm check valves are being operated. The water motor alarms shall be suitably mounted on the wall above the alarm valves and all pipe connections shall not be less than 20mm diameter. Each water motor alarm shall be arranged to drain through a non-ferrous fitting with an orifice. Drain lines shall be connected to water drain or sump pit in which the water will ultimately be discharged to surface water drains.

Pressure Switches