Section 7 Street Lighting

Standard Specification For Road Works

FOR INTERNAL USE ONLY

SECTION 7 STREET LIGHTING

Cawangan Jalan, Ibu Pejabat JKR, K.L

Page 159



SECTION 7 - STREET LIGHTING Page 7.1

GENERAL

7.1.1

Scope of Work

S7 - 162

7.1.2

On Site Commissioning Tests

S7 - 162

7.1.3

As-Built Drawings

S7 - 162

7.1.4

Maintenance

S7 - 163

7.1.5

Traffic Safety and Control

S7 - 163

7.2

LOW VOLTAGE UNDERGROUND CABLES

7.2.1

General

S7 -164

7.2.2 Types of Cables 7.2.2.1 Power Cables S7 - 4 7.2.2.2 Earthing Conductors S7 - 4

S7 - 164

7.2.3

Lengths of Cables

S7 - 164

7.2.4

Cable Routes

S7 - 164

7.2.5

Cable Trenches

S7 - 165

7.2.6

Cable Ducts

S7 - 165

7.2.7 Cable Termination 7.2.7.1 Termination of PVC Insulated Armoured Cable 7.2.7.2 Termination of Paper Insulated Cables

S7 - 166 S7 - 166 S7 - 166

7.2.8

Cable Jointing

S7 - 167

7.2.9

Cable Markers

S7 - 167

7.2.10

Cable Laying and Installation

S7 - 168

7.3

STREET LIGHTING LUMINAIRES

7.3.1

Light Distribution Requirements

S7 - 170

7.3.2 7.3.2.1 7.3.2.2 7.3.2.3 7.3.2.4 7.3.2.5

Constructional Requirements Luminaires Lamps Ballast Capacitors Ignitors

S7 - 170 S7 - 170 S7 - 171 S7 - 172 S7 - 172 S7 - 172


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page 7.4

FEEDER-PILLARS

S7 - 14

7.4.1

General

S7 - 172

7.4.2

Fabrication of Feeder-Pillars

S7 - 172

7.4.3

Factory Inspection

S7 - 173

7.4.4

Foundation

S7 - 173

7.4.5

Earthing

S7 - 173

7.4.6

Time Switches

S7 - 173

7.4.7

Contactors

S7 - 173

7.4.8

By-Pass Switches and Selector Switches

S7 - 173

7.5

COLUMNS AND BRACKETS S7 - 16

7.5.1

General

S7 - 174

7.5.2

Design Loading

S7 - 174

7.5.3 Fabrication of Column Sections 7.5.3.1 Doors and Door Openings 7.5.3.2 Service Slots

S7 - 174 S7 - 174 S7 - 174

7.5.4

Bracket Arms

S7 - 174

7.5.5

Base-Plates

S7 - 175

7.5.6

Baseboards

S7 - 175

7.5.7

Street Lighting Cut-Outs

S7 - 175

7.5.8

Earthing Terminals

S7 - 175

7.5.9

Cable Entry

S7 - 175

7.5.10

Erection of Columns

S7 - 175

7.5.11

Protection Against Corrosion

S7 - 176


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Standard Specification For Road Works Tests on cables shall include continuity, phasing out and insulation resistance between conductors and between conductors and sheaths by employing a 500 V insulation tester.The date of commissioning shall be agreed to by the S.O. and the Electrical Contractor shall ensure that the installation is safe before the cable is energised.

SECTION 7 - STREET LIGHTING

7.1

GENERAL

7.1.1

Scope of Work This work shall comprise the design of cabling works and the supply and installation of all luminaires, lamps, ballasts, capacitors, ignitors, feeder pillars, columns, ducting and cabling, and all necessary ancillary equipment, together with the transportation, storage, erection, connection, testing and commissioning of the same for a complete street lighting system, all in accordance with the Drawings and this Specification. The work shall also include cabling from the nearest specified power source of the local supply authority to the street lighting system, if required.

7.1.2

On Site Commissioning Tests On completion of the installation work on site, the Electrical Contractor shall, at his own expense, arrange for all necessary tests to be carried out on the installation by competent personnel as part of the tests required of him for the whole of the installation under this Contract.

The S.O. reserves the right to be present at all tests and the Electrical Contractor shall give at least one (1) week's notice in writing to the S.O. for this purpose. In any case, no test shall be carried out without prior approval from the S.O. Copies of all test certificates shall be submitted to the S.O. within one (1) week of the completion of the testing.

7.1.3

As-Built Drawings Within three (3) calender months from the practical completion of the installation, one set of true-to-scale negatives (110/115 g/sq.m A0 or A1 sizes) and four sets of prints of each of the following as-built drawings shall be submitted to the S.O. by the Electrical Contractor :i) Site plans; ii) Schematic wiring diagrams;

The tests to be carried out shall be as prescribed in the latest edition of the IEE Wiring Regulations and the Electricity (Board Supplies) Rules 1949, and shall include other tests deemed necessary by the S.O. In the event that the installation fails to pass any of these tests, the Electrical Contractor shall take such measures as are necessary to remedy the defects and the installation shall not be considered to have been completed until all such tests have been passed. Cawangan Jalan, Ibu Pejabat JKR, K.L

iii) Layout plans showing cable routes with reference to easily recognisable buildings and structures, sizes and types of cables, locations and types of joints, cable ducts, street lighting poles and luminaires, feeder pillars and earthing points.

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These as-built drawings shall be properly stencilled and shall have, at the lower right hand corner, the Electrical Contractor's name and address, the date of commissioning, the scale, drawing number (this shall be obtained from the S.O.) and title, and the following particulars:-

ii) replacing any broken or defective cable markers; iii) making good any damage to buildings, concrete areas, slopes, drains, culverts, existing cables, pipes, etc., which have not been properly made good as a result of the Electrical Contractor's work; and

JABATAN KERJA RAYA CAWANGAN ELEKTRIK CONTRACT NO. TENDER NO.

iv) carrying out any other work deemed necessary by the S.O. 7.1.5

In addition, one (1) set of the asbuilt drawings shall be properly framed and kept in the switchroom. If the as-built drawings submitted are not acceptable by the S.O., the Electrical Contractor shall amend and resubmit the drawings within two (2) weeks from the date of return of the drawings. 7.1.4

Maintenance During the Defects Liability Period, the Electrical Contractor shall per form maintenance work for the complete cabling and associated works. All labour, materials, tools and parts necessary to rectify the defects due to manufacturing or installation faults shall be supplied and/or executed at no extra cost to the Government. Maintenance work shall be carried out as soon as the Electrical Contractor has been informed by the S.O. to do so.

Traffic Safety and Control When work is being carried out beside any public road or other existing road, warning signs shall be erected. The general arrangement and location of temporary warning signs shall be strictly in accordance with ARAHAN TEKNIK (JALAN) 2C/85, published by Cawangan Jalan, Ibu Pejabat JKR, Kuala Lumpur, and shall be submitted by the Electrical Contractor and approved by the S.O. before work commences. Where it is necessary for any pit or trench to be left open overnight, flashing warning lamps shall be placed at each end of the pit or trench and at intervals not greater than 10 m apart. In built-up areas, barricades shall be erected along the length of the pit or trench in addition to the warning lamps. Where necessary, flag-men shall be stationed to control traffic.

The work to be performed shall include but shall not be limited to the following :i) replacing or making good any defective cables, cable joints and cable terminations; Cawangan Jalan, Ibu Pejabat JKR, K.L

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7.2


LOW VOLTAGE UNDERGROUND CABLES

7.2.1

iii) B.S. 6480 Part 1 and shall have high conductivity plain copper stranded conductors, insulated with strong longfibred paper, uniform in texture, free from metallic particles, mass impregnated with non-draining insulating oil compound suitable for a voltage of between 600 and 1000 V, lead alloy sheathed, double steel tape armoured and served.

General The Electrical Contractor shall submit, for the approval of the S.O., a program of work for the excavation of cable trenches, laying of cables, reinstatement of trenches, etc., one (1) week before the work is to be executed.

7.2.2

Types of Cables 7.2.2.2 Earthing Conductors

7.2.2.1 Power Cables Cables from street-lighting cutouts and earthing cables to luminaires shall be 2.5 sq.mm PVC/PVC cables bundled together with cable ties and terminated with lugs where necessary.

Power cables shall be manufactured and tested in accordance with :i) M.S. 274 or B.S. 6346 and shall have high conductivity plain copper stranded conductors, insulated with PVC suitable for a voltage of between 600 and 1000 V, laid together and bedded with PVC, armoured with galvanised steel wires and sheathed with PVC; or ii) B.S. 6480 Part 1 and shall have high conductivity plain copper stranded conductors, insulated with strong longfibred paper, uniform in texture, free from metallic particles, mass impregnated with non-draining insulating oil compound suitable for a voltage of between 600 and 1000 V, lead alloy sheathed and served; or


7.2.3

Lengths of Cables The lengths of each type of cable indicated on the Drawings and/or in the B.Q. are for tendering purposes only. The Electrical Contractor shall as certain the length of each cable required before placing orders for cables. The actual length of each cable installed shall be measured on site and the Electrical Contractor shall be paid according to the rate specified in the Contract. The rates quoted shall include any wastage due to cutting to lengths, terminations, etc.

7.2.4

Cable Routes Cable routes shown on the Drawings are for tendering purposes only. The Electrical Contractor shall, after consulting the S.O., peg out cable routes for the S.O.'s approval prior to excavation of the cable trenches.

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7.2.5

Cable Trenches Unless otherwise specified, cable trenches shall be 750 mm deep. They shall be of sufficient width as to enable provision of adequate spacing between cables but in any case shall not be less than 450 mm wide. Trenches shall be as straight as possible and shall have vertical sides which shall be timbered where necessary so as to avoid subsidence damage. The bottoms of trenches shall be firm and of smooth contour and any objects likely to damage the cable sheathing shall be removed. Material excavated from trenches shall be placed or removed so as to prevent nuisance or damage to adjacent areas or buildings. Trench excavation and backfilling shall be so executed that all roads, walls, sewers, drains, pipes, cables, structures, etc., shall be reasonably secured against risk of subsidence damage. Provision shall be made during excavation and until interim restoration has been completed for reasonable access of persons and vehicles to the areas of buildings adjacent to the trenches. Where a trench passes from a foot way to a roadway or at other positions where a change in level is necessary, the bottom of the trench shall rise and/or fall gradually.

7.2.6

Cable Ducts At road crossings, sewerage pipe crossings, water pipe crossings, paved areas, concrete areas and where specified by the S.O., cables shall be protected by galvanised steel pipes buried to a depth of 900 mm below finished ground level. The pipes shall be heavy duty pipes


Standard Specification For Road Works complying with B.S. 1387, complete with screwed and socketed joints. Unless otherwise specified, the pipes shall be 150 mm in diameter. The Electrical Contractor shall provide pumps and other appliances for the necessary pumping required for the disposal of water so as to prevent any risk of the cables and other materials to be laid in the trench from being detrimentally affected. Where necessary, bailing shall be provided. Where it is necessary to cross drains, culverts or similar obstructions which are too deep for the cables to be buried below, galvanised steel pipes as specified above shall be provided. The pipes shall be supported at each end in a concrete block and shall project through the blocks into the ground to a depth of at least 750 mm. All ducts shall be extended at least 600 mm beyond paved areas, concrete areas, drains, road crossings, pipe crossings, etc. Cables entering buildings shall be protected by pitch fibre ducts of 150 mm diameter, complying with B.S. 4108, complete with bend pieces, buried to a depth of 900 mm and encased in 75 mm of concrete all round. The ducts shall be installed with a gradient so as to drain away any water in the ducts. All ducts passing through walls shall be effectively sealed and made water-tight.

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Unless otherwise approved by the S.O., the number of cables installed in each duct shall be such that the space factor shall be not less than 60%. A drawn wire shall be provided for each duct. Unless specified to be provided by others, the above galvanised steel pipes and /or pitch fibre ducts shall be provided by the Electrical Contractor whether or not they are shown on the Drawings. 7.2.7

Cable Termination Unless otherwise permitted, all cable termination and jointing works shall be carried out in the presence of the S.O. A plastic laminated plate engraved with details such as size of cable, number of cores, date of com missioning, date of jointing, length of cable, distance of cable joint, etc., shall be securely fixed near the termination.

7.2.7.1 Termination of PVC Insulated Armoured Cables PVC/SWA/PVC cables shall be provided with compression cable gland termination. The cable gland shall be of gunmetal or brass and shall grip both the inner and outer PVC sheath of the cable. It shall be so designed that any strain on the cable is taken by the steel wire armouring which shall be effectively sealed between the gland itself and the outer cable sheath.

Standard Specification For Road Works 7.2.7.2 Termination of Paper Insulated Cables PILCDS and PILCDSTAS paper insulated cables, unless otherwise specified, shall be terminated by the heat shrinkable method. The cables shall be tested for moisture before termination is commenced. Samples of paper both from the layers nearest to and furthest from the conductor shall be immersed in transformer oil or paraffin wax heated to a temperature of approximately 115ºC. If any residual moisture is present, this will be detected immediately through the presence of bubbles. Samples of paper shall be tested singly and shall not be touched by hand, but shall be gripped with a pair of tweezers. Phasing and insulation resistance tests shall be taken on each length of cable laid before termination is commenced. The heat shrinkable termination materials used shall be supplied in a complete kit to suit various sizes of cable and to provide stress controlled, non-tracking, environmentally sealed termination. They shall consist of high permittivity, high resistivity, heat shrinkable, stress controlled, UV stable, non-tracking polymeric materials and heatactivated sealants to prevent ingress of moisture and contamination. Terminations shall meet the performance tests of IEC 112, IEC 446 and IEC 507, Section 3. They shall also have the following performance characteristics :-


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i) A.C. Voltage withstand for 15 minutes, 50 Hz : 4.0 kV phase to earth;

Core numbers printed on papers shall be observed when jointing and, whenever possible, such numbers shall be maintained throughout the system. Core numbers `0', `1', `2' and `3' shall denote neutral, red, yellow and blue phases respectively. In the case of 2-core cables, core number `1' shall denote the phase conductor and `0' the neutral. Crossing of cores in the cable boxes shall be avoided wherever possible and connections shall be consistent with the foregoing requirements.

ii) A.C. Voltage withstand for 4 hours, 50 Hz : 3.0 kV phase to earth; iii) Impulse Voltage withstand 10 positive and 10 negative, 1.2/50 microseconds : 8.0 kV peak phase to earth; iv) Continuous A.C. Voltage 1.5 kV phase to earth;

:

v) Insulation Resistance between phase conductor and ground : > 1000 Megaohms. 7.2.8

Cable Jointing Jointing of cables shall be undertaken only by competent and fully experienced jointers. Cable boxes, compounds and jointing materials used shall be of an approved type. Every cable joint shall be started and finished on the same day. Wherever cables are to be jointed in the open during wet weather conditions, the Electrical Contractor shall take all necessary precautions to prevent moisture from getting into the cables. Where cable sheaths are to be used as earth continuity conductors, the glands shall have the necessary contact surface to provide a low resistance path under fault conditions.

7.2.9

Cable Markers Cable markers with lettering and signs as shown on the Drawings shall be provided by the Electrical Contractor at every change of direction of underground cable routes and every 15 m on straight runs. Cable markers shall be of heavy duty reinforced concrete construction and shall be approved by the S.O. The cable marker shall form a trapezoidal block with a 100 mm square top face and 150 mm square bottom face, and shall be 400 mm in height as shown on the Drawings. The top face shall be indented in bold lettering with the initials "L.V." and a directional sign or signs indicating the direction/directions of the cable route. The cable marker shall be buried to a depth of 300 mm or any other depth as directed by the S.O. Cable joint markers of similar construction but with the symbol "X" shall be provided and installed at every cable joint in a similar manner.

Phasing and insulation resistance tests shall be taken before jointing is commenced.


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7.2.10


Cable Laying and Installation

(a) Cable Laid Direct In Ground

All cables shall be handled, laid and installed according to this Specification, the latest edition of the IEE Wiring Regulations, the cable manufacturer's recommendations and ERA Reports, using proper installation equipment, all to the satisfaction of the S.O.

Before any cable is laid, the trench shall be thoroughly inspected and any debris and other sharp objects shall be removed. The bottom of the trench shall be covered with a layer of clean sand 75 mm thick. The cables shall then be laid on this bedding in an orderly manner without overlapping and crossing each other. 75 mm of clean sand shall cover the laid cables and shall be spread over the trench before placing the cable protective covers.

All cables shall be supplied in complete lengths to suit the circuits they serve and no straight through joints shall be used. Straight through joints in the cable shall only be permitted in very exceptional circumstances such as those arising from unavoidable limitations in manufactured length. Where straight through joints or other approved joints are permitted by the S.O., the cost of such joints shall be borne by the Electrical Contractor. No joints in the cable will be allowed unless approved in writing by the S.O. The minimum bending radius of the cables shall be in accordance with Table 52 C of the latest edition of the IEE Wiring Regulations. Wherever cables are cut, the ends shall be immediately sealed in an approved manner unless it is intended to proceed with cable jointing or termination immediately. Unless otherwise permitted by the S.O., no cable shall be laid and/or covered up in the absence of the S.O.


Cable protective covers shall be of clay bricks. The bricks shall be new, well burnt and in complete pieces. They shall be laid lengthwise from end to end along the entire route of the underground cable if the cable size is not more than 120 sq.mm. For cable sizes in excess of 120 sq.mm, more than one row of bricks shall be laid. Each cable shall be seperately protected by these bricks and the cover shall have at least 25 mm overhang on each side of the cable. The trench shall then be backfilled with earth and shall be compacted in layers of 150 mm using a mechanical rammer. An orange coloured multi-strand nylon rope of minimum 6 mm diameter shall be laid at a depth of 300 mm along the trench to identify the cable route. At every 10 m interval, an extra 2 m of nylon rope shall be coiled and laid. The finished surface shall be left proud by 50 mm to allow for subsidence and the Electrical

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Contractor shall be responsible for the removal of any surplus material to a position indicated by the S.O. The surface of the refilled trench shall be temporarily reinstated and maintained in a thoroughly safe condition until complete consolidation of the soil has been achieved. As soon as the soil has consolidated, the trench shall be made good to its original condition, all to the satisfaction of the S.O. (b) Cable Installed In Precast Concrete Trenches Methods of installation of cables in precast concrete trenches shall be in accordance with Type L, Type M, or Type N of Table 9A of the latest edition of the IEE Wiring Regulations. However, if the method is not specified, the cables shall be installed as directed by the S.O. Cables laid in the bottoms of trenches shall be in accordance with Method Type L of Table 9A of the latest edition of the IEE Wiring Regulations. Cables installed on trench walls shall be in accordance with Method Type M or Type N of the latest edition of the IEE Wiring Regulations and shall be secured on a cable tray by means of saddles at suitable intervals. In the case of single core cables, whether secured individually or in a group to the cable tray, nonferrous saddles shall be used. Cable trays shall be fabricated from perforated hot-dipped galvanised sheets finished in an orange enamel. Cawangan Jalan, Ibu Pejabat JKR, K.L

Standard Specification For Road Works The minimum thickness of the sheet steel used shall be 1.5 mm for cable trays with widths of up to 300 mm, and 2.0 mm for widths exceeding 300 mm. Cable trays shall be supported at least 25 mm from the trench wall by mild steel brackets at 600 mm intervals. Brackets shall be anti-rust treated and painted with one coat of primer. Samples of cable trays and brackets shall be submitted to the S.O. for approval prior to installation. To provide electrical continuity, all cable joints shall be bridged by means of tinned copper tape of dimensions not less than 25 mm x 3 mm. All saddles for cables on cable trays shall be installed by bolts, washers and nuts. All tees, intersection units, adaptor units, etc., shall be factory manufactured unless otherwise approved by the S.O. Trenches inside buildings shall be filled with clean sand up to a level above the cable ducts. (c) Cable Run On Walls and Under Floor Slabs Cable run on walls and under floor slabs shall be mounted on perforated hot-dipped galvanised sheet steel cable trays. The construction and finish of the cable trays and the method of installation of cables on cable trays shall be as described in SubSection 7.2.10 (b) above. Cable trays shall be suspended from floor slabs by hangers or mounted on walls by brackets at 600 mm intervals. The materials and finishes used for the hangers, brackets and other suspending and supporting structures shall be Page 169


the same as those described for brackets in Sub-Section 7.2.10 (b) above. Where cable trays pass through floors or fire resistant walls, the surrounding holes shall be sealed to the full thickness of the floor or wall with non- hygroscopic fire-resisting material of minimum 2-hour fire rating as approved by the Jabatan Bomba Malaysia.

7.3

7.3.1

STREET LIGHTING LUMINAIRES

Light Distribution Requirements Unless otherwise specified, the performance and light distribution of street lighting luminaires shall be of the Low Threshold Increment (LTI) type. The direction of maximum intensity of flux shall lie between 0º and 65º of the downward vertical and the maximum permissible value of the intensity emitted at 90º and 80º shall not exceed 10 cd/1000 lumens and 30 cd/1000 lumens respectively. Each luminaire shall normally direct two beams along the length of the road. The polar light distribution curves for the luminaire shall generally be smooth and free from any abrupt variations so that the luminous intensity diminishes smoothly and progressively from its maximum.


Standard Specification For Road Works 7.3.2

Constructional Requirements

7.3.2.1 Luminaires All luminaires shall be new, totally enclosed, dust proof,insect proof and watertight and shall be tested in accordance with B.S. 4533. All exposed parts shall be of non-corrosive materials. The luminaires shall provide the requisite light distribution with the size and type of lamp specified. Each luminaire shall consist of a lamp compartment made up of an upper canopy or housing and a lower bowl assembly, a lampholder, cable clamps, mains connectors and earth terminations, as well as all necessary control gear. The control gear shall be pre-wired and integral with the luminaire. The luminaire wiring shall be of a size and insulated with a material that will more than effectively withstand the current, voltage and temperatures expected within the luminaire during both the starting and operating modes in the ambient temperature of the Site. The lamp compartment of the luminaire shall be accessible via a hinged bowl made of ultraviolet stabilised plastic material such as acrylic which shall, in the closed position, bed firmly upon a soft resilient neoprene or non-ageing felt gasket. The gasket shall be positively secured in the luminaire housing and shall be weather-resistant. The bowl shall be secured firmly to the luminaire body by means of stainless steel clips and hinged pins.In the lowered position of the bowl, it shall be restrained from becoming detached or being Page 170


blown towards the other portion of the luminaire or the column arm. If independent reflectors are incorporated in the luminaire, such reflectors shall be of high purity aluminium mirrors, chemically anodised to yield optimum reflection of light distribution. Full details of the luminaire and accessories shall be furnished as required in the Appendices to this Specification.

Standard Specification For Road Works The lamps supplied shall have a mortality rate not greater than 10% at 5,000 switched operating hours and shall not take longer than 4 minutes after the initial "switch on" to attain 80% of their guaranteed output at the rated voltage of 200/250 V and frequency 50 Hz. The reignition period after an interruption of the supply shall not be longer than 1 minute to attain 80% of the lumens output.

7.3.2.2 Lamps (a) High Pressure Sodium Vapour (HPSV) Lamps High presssure sodium vapour (HPSV) lamps shall conform to IEC Publication 662 and shall have a colour temperature of approximately 21,000 K. The majority of the light output shall fall within the 560-610 nanometre waveband, i.e. in the yellow/orange, range. The lamps shall have an initial luminous efficiency of approximately 115 lumens per watt for a 400 watt lamp and 100 lumens per watt for a 250 watt lamp. The lumens output after 100 operating hours shall be 45,000 lumens for a 400 watt lamp and 25,000 lumens for a 250 watt lamp. The lamps shall be of tubular or of any other approved shape and shall have plated brass caps securely fitted to the glass envelopes. The cap shall be of GESE40 material to fit the luminaire supplied.


(b) Low Pressure Sodium Vapour (LPSV) Lamps Low pressure sodium vapour (LPSV) lamps shall conform to the requirements as laid down in B.S. 3767. The majority of the lumens output shall be within the 580-590 nanometre waveband range. The lamps shall have an initial luminous efficacy of approximately 160 lumens per watt for a 135 watt lamp. The lumens output after 100 operating hours shall be not less than 50 lumens per watt. The lamps shall be of tubular shape with a bayonet cap (B.C.), shall take no longer than 11 minutes after initial "switch on" to attain 90% of of their quoted lumens output. All LPSV lamps shall be guaranteed for a minimum operating life of 4,000 operating hours. All lamps shall be suitable for use, in conjunction with their control gears, on 220/240 V supply and shall be capable of being started and operated at 10% reduction in rated voltage. Page 171


7.3.2.3 Ballast The ballast shall be manufactured to B.S. 4782. It shall be correctly rated for its duty and shall be designed to operate on a dual mains voltage of 220/240 V by means of suitable tappings. The tappings shall be brought out to marked terminals. The ballast shall have laminated cores and high conductivity windings with power loss and noise kept to a minimum.

Standard Specification For Road Works 7.4

FEEDER-PILLARS

7.4.1

General Feeder-pillars shall be supplied completely assembled with control gear and all internal electrical and mechanical inter-connections and structural parts for voltages up to and including 1,000 volts A.C. They shall comply with and be tested to the requirements of B.S. 5486.

7.4.2

Fabrication of Feeder-Pillars

7.3.2.4 Capacitors Capacitors shall be manufactured to B.S. 4017 and housed in extruded aluminium canisters with shrouded screw terminals. They shall not be fused but shall have an an external safety dis charge resistor. The capacitor shall be capable of raising the power factor of each circuit to at least 0.85 lagging. 7.3.2.5 Ignitors Ignitors for the discharge lamps shall be of the electronic / superimposed pulse type rated for the appropriate wattage. The unit shall be capable of operating on a voltage ranging from 200 to 250 volts. The unit shall be totally enclosed with an external terminal block for the supply connection and a length of high tension cable shall be included for the lamp connection. It shall be compatible with the normal control gear. The case of the unit shall carry a label showing the connections and listing the appropriate voltage.


The Electrical Contractor shall submit a design drawing of the shape, size, electrical and mechanical connections, materials, etc., of the feeder-pillar for the approval of the S.O. prior to manufacture. The plinth, foundation work, etc., shall be included in the design drawing. The feeder-pillar housing shall consist of a drip canopy, rigidly welded channeled steel framework manufactured from 2.64 mm (12 s.w.g.) sheet steel. It shall be hot-dip galvanised and the process of galvanising, treatment before galvanising and treatment after galvanising shall be as described in Sub-Section 7.5.10 of this Specification. On the front and rear sides of the feeder-pillar, the following sign shall be stencilled in red paint using a lettering height of 90 mm :BAHAYA 415 V LAMPU JALAN The door of the feeder-pillar shall be rigidly reinforced and hinged internally to prevent unauthorised access. The feeder-pillar shall be lockable with either wedge-type locks protected by screw Page 172


plugs or some other secret locks approved by the S.O. The feederpillar shall be self-ventilated and weather proof and such ventilation openings shall be protected by wire mesh to prevent the entry of vermin, rodents and birds.

Standard Specification For Road Works copper tape, precast concrete earth chambers with covers, etc. 7.4.6

Time switches supplied for the control of luminaires, etc., shall be of the synchronous/step-by-step motorwound handset dial plug-in type. They shall incorporate a 24-hour spring reserve or a battery back-up system. Time switches shall be rated as specified in the Drawings and shall be operational on a 220/240 V, 50 Hz supply.

A baseboard made of tufnol or other approved treated hardwood of at least 16 mm thickness shall be included to mount equipment such as time switches, contactors, etc. 7.4.3

Factory Inspection 7.4.7 The Electrical Contractor shall make arrangements to witness the electrical tests and for joint inspection to be carried out at the factory prior to transportation to the Site.

7.4.4

Earthing The earthing system for the feederpillar shall comply with the Rules and Regulations of the Supply Authority, The British Code of Practice C.P. 1013, the relevant sections of the latest edition of the IEE Wiring Regulations and the Contract Drawings. Each feeder-pillar shall be effectively earthed using 4.8 mm x 16 mm diameter steel core copper-jacketted earth electrodes, 25 mm x 3 mm


Contactors Contactors shall comply with B.S. 5424 with uninterrupted ratings, mechanical duty Class 2 and a utilisation category of at least AC3. The contactor coils shall be fully tropicalised and wound for continuous operation for a 220/240 V, 50 Hz supply. The contacts of the contactor shall be rated for the breaking capacity of the connected load.

Foundation The Site of the foundation of the feeder-pillar shall be filled where required, compacted and levelled before the reinforced concrete base of minimum 250 mm height above the finished earth level is constructed. Cable entry ducts shall also be provided.

7.4.5

Time Switches

7.4.8

By-Pass Switches and Selector Switches Single or three-phase by-pass switches as applicable shall be connected in parallel with the contactors for use in the event of the failure of the contactors. These shall be manufactured to B.S. 5419 and shall be capable of breaking the load connected to the contactors without undue ageing or damage. A four-position selector switch shall be provided to select the mode of operation and shall be appropriately labelled.

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7.5


COLUMNS AND BRACKETS

7.5.1

minimum overlapping position of 1.5 times the external across-faced dimension.

General 7.5.3.1 Doors and Door Openings All columns and brackets shall be of tapered, octagonal, hot-dip galvanised interchangeable sections complying in all respects with the Drawings. They shall be manufactured to comply with B.S. 1840 and B.S. 5649 with Grade 43C or 50C steel conforming to B.S. 4360. The base-plates and bracket arms shall be manufactured as seperate units suitable for mounting or fixing on to the columns.

7.5.2

Weather proof doors shall be provided with an anti-vandal locking device over the door opening of each column as shown on the Drawings. The complete locking device shall be made from stainless steel. Door openings shall have internal reinforcement to compensate for the loss of stiffness in the columns caused by forming the door openings.

Design Loading 7.5.3.2 Service Slots The columns shall be designed to withstand loadings comprising :-

For flange mounted types of columns, cable entries shall be through the flange plates via a hole of suitable diameter as shown on the Drawings. A suitable duct for cable entry shall also be provided at the concrete base.

i) loads due to wind speeds of up to 27 m/sec.; ii) loads due to the weight of the columns, lighting luminaires and bracket arms;

For planted root types of columns, service slots shall be on the same side and vertically below the service doors.

iii) other applied loads if applicable. 7.5.3

Fabrication of Column Sections Each column section shall be mechanically formed and longitudinally welded by the continuous automatic gas shielded electric arc process (M.I.G. process) to B.S. 5135. The sections shall be constructed so as to overlap each other by a minimum of 1.5 times the diameter of the immediate lower section (external across-faced dimension) and to be easily assembled on site by using simple tools without employing welding techniques. The manufacturer shall provide a mark on the finished column section indicating the


7.5.4

Bracket Arms Bracket arms shall be of suitable outreach as indicated on the Drawings and in the B.Q. The bracket arms shall be octagonal in shape for up to 2.0 m in length. For bracket arms longer than 2.0 m in length, the extra length shall be formed from Grade 43C tubular steel conforming to B.S. 4360. The bracket arms shall be arranged so as to give a 50 uplift as shown on the Drawings. A tubular steel spigot of appropriate dimensions for the Page 174



luminaire shall be welded at the end of each bracket arm. After welding, etc., bracket arms shall be treated as described in Sub-Section 7.5.10 before being hot-dip galvanised. 7.5.5

cables as appropriate. Cut-outs shall be provided with adequate shrouding to prevent cross-phasing or accidental contact with live metal. The fuse carriers shall be selfaligning and shall accept any of the standard rated fuses for the purpose. Each unit shall possess high mechanical and di-electric strength and shall be suitable for use in the tropics. Samples of complete cut-out units shall be submitted for the approval of the S.O.

Base-Plates For flange mounted types of columns, flange-plates of substantial thicknesses as shown on the Drawings shall be welded on to the columns. For planted root types of columns, detachable anti-sink plates shall be supplied.

7.5.8

Columns shall be provided with a corrosion resistant terminal having substantial contact surfaces for the attachment of an earthing lead. This terminal shall be provided close to the door opening inside each column. Where bolts are used, they shall be not less than 6 mm in diameter and shall be provided with two suitable washers and nuts.

Base-plates, nuts and bolts, etc., shall be hot-dip galvanised after manufacture. 7.5.6

Baseboards A piece of baseboard shall be included in each base compartment for cable termination or control gears assembly. Baseboards shall be made from fibre board of 10 mm thickness. Alternative baseboards made from galvanised perforated metal may also be used with the approval of the S.O. Baseboards shall be made to the dimensions as indicated on the Drawings and shall be fixed securely in position inside the columns.

7.5.7

Street Lighting Cut-Outs Street lighting cut-outs shall be of a type manufactured for use in street lighting installations. They shall have facilities for double fusing loop-in loop-out terminals. The cutout bases shall have a supply cable contact block rating of at least 50 A and shall be capable of accepting circular cable cores of up to 25 sq.mm copper 2-core or 4-core


Earthing Terminals

7.5.9

Cable Entry Armoured cables brought into the columns shall be provided with compression cable gland terminations. An appropriate type of earthing clamp shall be provided to bond the armouring of the cables which shall be effectively earthed.

7.5.10 Erection of Columns Columns shall be installed in accordance with the manufacturer's recommendations and as shown on the Drawings. The Electrical Contractor shall peg out the positions of the columns for the approval of the S.O. before planting the columns.

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Columns shall be erected such that the service doors shall face away from on-coming traffic except at parapets of bridges and retaining walls. At such locations, the orientation of the service doors shall be determined by the S.O. After erecting each column, backfill shall be compacted by means of suitable ramming equipment. 7.5.11 Protection Against Corrosion Individual sections of the columns, base-plates, doors and bracket arms shall be protected against corrosion by hot-dip galvanising the sections both internally and externally, all in accordance with B.S. 729. All welding works shall be completed before galvanising.


Standard Specification For Road Works Treatment prior to galvanising shall include degreasing, rinsing, pickling, further rinsing and fluxing. The minimum average weight of the zinc coating shall be 460 g/sq.m for any individual test area. The galvanised columns and bracket arms shall be of prime finish and of good uniformity, i.e. they shall be free from injurious defects such as blisters, flux and uncoated spots. The planted sections of columns and the base-plates shall be factorycoated with bitumen using the hotdipping process conforming to AASHTO M 190.

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Section 7 Street Lighting

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