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SECTION - 8154

LUMINARIES FOR STREET LIGHTING

1.0 SCOPE OF WORK

The work under this section consists of design, manufacturing, supplying, installation, connecting, testing and commissioning of the complete street lighting system and accessories as specified herein, or as shown on the Tender Drawings and given in the Bill of Quantities.

The Contractor shall discuss the electrical layout with the Engineer and coordinate at site with other services for exact location and position of the electrical route and equipment.

The equipment and accessories shall also comply with the General Specifications for Electrical Works Section-8001 and with other relevant provisions of the Tender Documents.

2.0 GENERAL

The luminaries type is given on the drawings and is specified in the items of the Bill of Quantities. Where a definite manufacturer's type and catalogue number is specified, it shall serve as an illustration of type and, if the particular type of fitting specified is not available, approved equivalent fitting may be accepted. The luminary shall be able to give light over a wide area along the length of road.

The determination of equality will be based on certified photo-electric data covering the coefficient of utilization, average brightness data as well as equivalence of construction material, shape, finishes, operation, etc. For any substitution the Engineer's approval is necessary. The Contractor shall submit sample of luminaire specified and obtain approval of the Engineer before commencing the installation.

The group of luminaries shall be controlled automatically through photoelectric switches as well as manually whenever so is required or for testing purposes. The lighting control device shall be similar to as given in WAPDA specification P-102:76 with up to-date revision.

3.0 ENCLOSED STREET LIGHTING LUMINARIES

Enclosed road luminaries for use on poles shall be manufactured according to International Standard such as IEC 598 (part 1 & 2)-luminaries. These shall be suitable in all respects for High Pressure sodium (SON) lamps of given wattage and mounted at a height above finished road level as shown on the drawing.

The luminaries shall be of pleasing aesthetic appearance with high quality finish. The luminaries will be designated to accommodate and be complete with 240 Volt, High

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Pressure Sodium Vapor Lamp with GES cap as given in the BOQ or shown on the drawings and shall provide a `CUT-OFF' light distribution in accordance with CIE-12 (2nd Edition) recommendations. The control gear shall be mounted inside the lantern body on removable gear tray.

The light flux to be provided by the luminary in the lower hemisphere shall not be less than 72% of the lumens output of the lamp.

The lamp compartment of luminaries shall be totally enclosed with protection class IP-65. The refractor bowls of glass or equivalent material shall be suitable in all respects for site service conditions, and which shall stand up to the heat from the lamp in the temperature conditions prevailing at site.

The luminaries shall have body of corrosion resistant high pressure die-cast aluminum or similar light alloy material suitable in all respects for site service conditions.

The optical system shall be so attached to the luminary body as to allow easy access without danger of the refractor falling to the ground. The lamps will operate in the horizontal position and the light directing equipment should be such that it can be fitted in the correct orientation to the light source.

All nuts, bolts, hinges and other fixings shall be of aluminum, stainless steel or galvanized steel.

The reflectors of polished aluminum sheet, electro-processed treated inside the fitting shall be used to give maximum light output towards the road.

Gaskets shall be capable of withstanding the temperature radiation, moisture, rain and other conditions to which they will be exposed. The gaskets shall be attached to the lantern such that they will be retained in position when the lantern is opened for maintenance.

Terminals shall be of tinned brass or other non-corrodible material and each terminal shall have at least two pinching screws for the incoming cable which shall be suitably anchored to the lantern so that the terminal connections are not in any way strained by the weight of the cable. All terminals shall be indelibly identified and suitable cable terminals shall be provided.

All internal wiring of the light fittings shall be carried out with cable having a non-hygroscopic heat resistant cross-linked polyethylene or similar primary insulation which shall withstand without deterioration the temperature to which it may be subjected during service, and shall have sufficient flexibility for the purpose required.

Lamp control gear shall be provided preferably in a separate compartment of the lantern body with protection class IP-43. A wiring diagram with Wattage, operating Voltage and current ratings shall be clearly printed on the body of the ballast. The control gear shall

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be of low power loss and fully tropicalized and with `H' insulation. Control gear shall operate the lamp without adversely affecting the lamp life and performance. Compatibility between igniter, lamp and ballast shall be established.

The power factor correction capacitors shall be contained in leak-proof metal containers. The value of the capacitor contained shall be such that power factor of light fitting is 0.9 or better. Capacitors shall be fitted with internal discharge resistances. Terminals of the capacitors shall be covered by PVC shrouds.

The wiring connections between ballast and capacitors etc. and associated tails for lamp connections shall be with insulated copper wire of size 2.5 mm2 in high temperature resistant insulation such as cross-linked polyethylene. A terminal block of porcelain or high quality thermoplastic material for screws shall be provided; also a clamp for anchoring the supply leads (or three core cable) from the cutout at the pole bottom.

4.0 DATA TO BE SUBMITTED

The Contractor shall submit the following for the lighting fittings to the Engineer for his approval before execution:

- Computerized lighting calculations, ISO-contour diagram and luminance chart for the proposed light fitting and lamps.

- Total light output of lamp used and the lantern.- Light output ratio.- Total lumens in lower hemisphere.- Scale drawings of lanterns showing construction details.- Type of reflector and details of material used.- Catalogue and/or any other illustrations for lantern.- Total electrical consumption of lamp and ballast.- Total wind area of lantern.

5.0 INSTALLATION

Luminaries (lighting fittings) shall be installed, connected and properly aligned to ensure proper light distribution on the road without dark patches.

The erection of light fittings shall include preferably one three core 2.5mm2 PVC/PVC cable or from porcelain/thermoplastic connectors in the junction box up to lamp holder through the hollow of pole in case the supply is fed from the underground cable. The luminaries shall be earthed from the earth point of junction box.

The lighting fittings shall be thoroughly cleaned and all dust on the fitting shall be removed. The Contractor shall ensure that the connections to the power factor correction capacitors and all other connections are tight and proper. The light fittings shall be installed after the poles are erected to avoid damage to the fittings during installation.

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6.0 MEASUREMENT AND PAYMENT

6.1 Measurement

Measurement shall be made for the number of light fixtures including all accessories such as lamp, lamp holder, ballast and power factor correction capacitor etc. acceptably supplied and installed by the Contractor as a complete unit.

6.2 Payment

Payment shall be made for the number of units measured, as provided above, at the Contract unit price each and shall constitute full compensation for supplying, installing, connecting, testing and commissioning of each light fixture with accessories as required for completion of job to the satisfaction of the Engineer.

7.0 LT CABLES

7.1 General

The cable manufacturer shall be certification holder of ISO-9002 and shall be approved by the Engineer. The cables for road lighting shall be PVC insulated PVC sheathed, galvanized steel wire armoured, 600/1000 Volt grade, designed, manufactured and tested in accordance with IEC-502 or other equivalent international standards.

For lighting system the cables shall be single or multicore as required with stranded copper conductors and polyvenylchloride heat and moisture-resistant insulation of the thickness listed in IEC or British Standard.

The route of the cables shall be as shown on the drawing. Any change in route required due to site conditions shall be made in relation with other service layout and with the approval of the Engineer.

7.2 Material Requirements

The cable shall be suitable for operation at conductor temperature upto 70o C under normal conditions.

Conductors shall be of high purity electrolytic annealed copper wires and shall conform to the requirement of the following BS or equivalent standard.

If armouring is required it shall consist of galvanized steel wires complying with BS 1442 and shall provide conductivity not less than 50% of the phase conductor.

BS 6746: - PVC insulation and sheath of electric cables.

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BS 6360: - Copper conductors in insulated cables and cords IEC 228: - Conductors of insulated cables

7.3 Cable Sizes

The sizes of LT copper conductor cables shall be as shown on the drawings. Care shall be taken so that voltage drop at the far end of the cable does not exceed 3% of the nominal voltage. Cables manufactured by the reputed firms shall be used, provided they fulfill all the requirements of the specifications:

7.4 Phase Identification

All cables shall have phase identification colour on the insulation of each core. The colour code of three phase circuits shall be red, yellow and blue for phase conductors and black for neutral conductor. From pole junction box up to lantern green or green and yellow striped PVC insulated wire shall be used as earth continuity conductor (ECC).

For all cables, to be supplied and installed, the Contractor shall submit complete technical data, including conductor material, insulation material current carrying capacity, Voltage grade, weight for 100 meters etc. and all such data shall be supported by test certificates, current and temperature rise curves etc. for approval of Engineer.

7.5 Cable Accessories

All accessories shall be provided without additional cost for the complete cabling and wiring system. These shall include but not be limited to items such as clamps, fixing channels, connectors, cable joints (where necessary and as approved by the Engineer), clips, lugs, tapes, solders, identification tags, bushes & glands etc.

8.0 INSTALLATION

Power supply to the poles at the road crossing shall be with PVC insulated PVC sheathed cable passing through pipe as specified and as shown on the drawings. Individual pole connections shall be by means of the power supply cable looping between poles. The cable from respective distribution box shall enter first lighting unit at its three phase and neutral service cutout and then similarly looped to the next. The Luminaries on each pole shall be connected alternately to each of the three phases.

Cable routes shall consist of trenches or 50mm dia PVC pipe as suitable or as shown on the drawings. The cable if laid in trench shall be at least 500mm below the general ground and 750 mm below road level, with sand cushion around cable and a layer of 230mm wide bricks over sand along the entire route of cable. The bricks shall be laid in such a way to provide equal margin of cover on both sides of the cable.

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Slack shall be left in cables for which purpose the cut lengths of cables shall allow about 3% more in the measured length between terminations (Engineer will verify the lengths of cables). At junction boxes, ample slack shall be left to prevent straining of cable joints due to settlement of cable trench.

Cables, whether installed in bare ground or in pipes shall not be bent to a radius less than that recommended by the cable manufacturers.

Upon completion of cable installation, the Contractor will be required to undertake testing as approved by the Engineer or the street lighting department and shall comply with IEE wiring regulations. The copies of test results shall be supplied to the Engineer.

9.0 MEASUREMENT AND PAYMENT

9.1 Measurement

Measurement shall be made for the number of running meters for each size and type of cable complete with required accessories acceptably supplied and installed by the Contractor. For 2.5 mm2 cable from junction box to lighting fitting lamp holder through hollow of pole, it shall be on each cable basis.

9.2 Payment

Payment shall be made for the number of running meters of each size of cable measured as provided above, at the contract unit price each and shall constitute full compensation for supplying, installing, connecting and commissioning, of the cables. Payment for 2.5 mm2 cable from junction box to lighting fitting lamp holder shall be lump sum on each cable basis.

10.0 EARTHING

10.1 Material

10.1.1 Earthing by Earth Rods

The earth rod shall be of steel and shall be protected against rusting by a thick exterior layer of copper (not less than 0.33 millimeter), permanently molted or electrolytically deposited on a high strength steel core which shall provide rigidity for easy driving without bending. The earth rod shall

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have nominal dia of 16mm with chamfered head of 2x45 mm (chamfer). The overall length of the rod shall be 1500mm.

10.1.2 Earthing Lead

The earthing lead shall connect the earth electrode to earth connecting point or equipment. It shall be of round hard drawn bare electrolytic copper of size shown on the drawings.

10.1.3 Earth Continuity Conductor

Earth continuity conductor (ECC) shall be hard drawn bare copper wire or single core PVC insulated copper conductor cable of sizes indicated on the drawings.

The specifications for single core PVC insulated cables used as ECC shall be same as those in relevant sections of technical specifications.

10.2 Installation

10.2.1 General

Earthing system as shown on the drawing shall be installed by the Contractor. The earthing system shall give earth resistance, including the resistance of soil, earth leads and ECC, equal to or less than one ohm.

For earthing of equipment proper size copper or brass thimbles or lugs shall be used to which the copper wire shall be connected by copper brazing. The soldering of copper wire at joints or terminations, shall not be allowed. For connections to metallic body, the surface shall be thoroughly cleaned before bolting the lug or socket.

10.3 Earth Continuity Conductor/Earth Wire

All other metal work shall also be connected to earth by suitable size of ECC so that earth resistance is less than one ohm.

At joints or terminations, the ECC shall be connected using proper accessories. No connection shall be made by twisting of earth conductors.

10.4 Earth Resistance Test

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Earth resistance tests shall be done on the earthing system by separating and reconnecting conductor. The resistance of earthing leads in the installation shall not exceed one ohm.

Earth resistance test shall be performed as per Electrical Inspector's requirements.

11.0 MEASUREMENT AND PAYMENT

11.1 Measurement

Measurement shall be made for the number of poles including all accessories and foundation block acceptably supplied and installed by the Contractor as shown on the drawing.

11.2 Payment

Payment shall be made for the number of units measured, as provided above, at the contract unit price each, and shall constitute full compensation for supplying, installing, connecting, testing and commissioning of each pole including junction cutout box.

C2/Biat/specs/20748154.doc