July Specification- Street Light Design

8/3/2019 July Specification- Street Light Design

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ENVIRONMENT

STREET LIGHTING INSTALLATIONS

RESIDENTIAL AND INDUSTRIAL ESTATES


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Specification for Street Lighting

Residential and Industrial Estates

Index

Page

1. General Requirements 1

2. Siting of Equipment 1

3. Adoption of Lighting 1

4. Design Standards 2

5. Regulations, Codes and Specifications 2

6. Columns and Brackets 3

7. Corrosion Protection 5

8. Raise and Lower Columns 6

9. Siting of Columns 7


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22. Internal Wiring and Distribution Cables 13

23. Illuminated Road Signs 13

24. Electricity Supply Services 14

25. Earthing 15

26. Painting 15

27. Electrical Testing of Equipment and Commissioning 15

28. Adoption and Maintenance 16

Appendices

1,2,3,4 Typical Wiring Arrangements

5 Typical Layout and Schematic Diagram6 Column Foundation7.8 Test Report Forms9 Pedestrian Refuge Signs Standard Detail


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Specification for Street LightingResidential and Industrial Estates

1. General

1.1 The developer shall provide an approved form of street lighting as anintegral part of the estate development. Proposals for street lightingmust be included with the drawings and specifications and besubmitted for the approval of the Director of Environment prior to works

commencing. The proposals shall include the positions of lightingcolumns, type of columns, lanterns, cables and cable routes andElectricity Company services. Two copies of each drawing containingthe proposals should be submitted for approval together with a copy ofthe design data showing proposed illumination levels, and cable designcalculation where appropriate

The approved drawings will be used on any subsequent adoption inspections,

therefore any changes made to road or lighting layout should be resubmittedfor approval.

2. Siting of Equipment

2.1 All street lighting and associated cable works and ancillary equipmentshall only be installed within the area of the estate which it is proposedwill be adopted as highway. In exceptional circumstances and with the

i l f th Di t f E i t th d l b


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3.3 It is the developers responsibility to obtain a MPAN number when requestingunderground services for the lighting installation from the electricity company.The developer will then be charged for the energy consumed by the streetlighting installation from the date of connection to the date the Part 2Certificate is issued. Following the issue of the part 2 Certificate thedeveloper should inform the electricity company that they are no longerresponsible for the energy consumed by the street lighting.

3.4 Formal adoption of the lighting takes place after the 12 months maintenanceperiod when the roads and footpaths are adopted.

4. Design Standards

Street lighting schemes must comply with the current edition of BS EN 13201-2:2003 and the guidance and recommendations in BS 5489-1:2003.

4.1 Urban Traffic Routes, Main Distributor Roads Generally 10 metre mountingheight column supporting 150/250w SON lantern as appropriate to meet therequirements for the appropriate ME lighting class.

4.2 Industrial Estate, Local Distributor and Access Roads Generally 8-10 metremounting height column supporting high pressure sodium (SON) lantern tomeet the requirements for the appropriate lighting class


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6. Street Lighting Columns and Brackets

6.1 Columns shall be manufactured from tubular or sheet steel and shall conformto the following:

i) The column and bracket manufacturer shall be registered with andaccredited under the Quality Assurance Scheme ISO9002 for the

manufacture, supply and verification of lighting columns. A copy of theaccreditation document shall be supplied to the Engineer on request.

ii) The design, manufacture and installation of lighting columns shallcomply with the relevant requirements of BSEN40 as amended byBD26/04 which also requires a fatigue check. The design of allcolumns shall include for the mounting of a sign plate 5kg in weight,rectangular in elevation with a surface area of 0.3m2 at 2.5 metres

above ground and 300mm eccentricity.

iii) Unless otherwise detailed on the Scheme/Works Order, columns andbrackets shall be designed to be capable of accepting lanterns with thefollowing parameters.

Mounting Height (m) Lantern Weight(kg)

Windage Area(m2)


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6.3 i) All columns shall have a cable entry slot 75mm x 150mm with the topof the slot 350mm below ground level.

ii) Columns manufactured in tubular steel shall have shaft and basesections manufactured from continuous lengths of new steel tube andshall not contain any welded or stepped sections.

The shaft sections shall have minimum diameters of 76mm and114mm for 5/6m and 8/10m respectively.

iii) The base section of columns shall have a minimum wall thickness of5mm and have base compartment openings of a minimum

(a) 500 x 100mm for 5 and 6 metre columns(b) 600 x 115mm for 8, 10 and 12 metre columns

The height above ground of the base section shall be 1250mm.

6.4 All columns shall be designed for the following conditions:-

(a) Mean hourly wind speed Vref of 25m/s.(b) Site altitude of 250 metres.(c) Terrain category III for 5 and 6 metre columns.

T i t II f 8 10 d 12 t l


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(b) 42mm OD x 127mm long for 8, 10 and 12 metre columns.

6.7 The method of joining the base section and the shaft shall be by a swage jointwith an internal centralising washer. All welding procedures shall be inaccordance with the requirements of BS EN288 and all welders approved tothe requirements of BS EN287 with welding carried out in accordance withBS5135.

6.8 The same pattern of door lock shall be used throughout all columns. Keys

shall be supplied for 10% of all columns supplied. The door fixing bolt shallhave a tapered end to facilitate self centering when closing.

An internal full length, equivalent to the door size, base board, substantiallynon-hygroscopic, shall be fitted in each compartment for mounting controlgear. Base board fixing studs or bolts shall not protrude beyond the front faceof the base board. The base board shall be firmly bolted in position. Ondelivery, the column door shall come assembled on the column.

6.9 All columns shall be fitted with M8 x 30mm brass earth studs, threaded thewhole length, with two plain washers and two nuts within the basecompartment and that are easily accessible. Column doors shall be providedwith an internal lug to enable earthing of the column door with an M8 brassearth stud.

6.10 There shall be no sharp edges within columns or bracket arms to damagel t i l bl d i i t ll ti i A ti h f i h ll b


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on the overall external surfaces, one coat of Mordant Solution,T wash.

2nd Coat On the internal root section to 250mm above ground level, onecoat of modified vinyl micaceous iron oxide with high solids togive a high build coating colour grey to provide a minimum dryfilm thickness of 60 microns.

3rd Coat On the external surface overall one coat of two pack high build

epoxy zinc phosphate primer, light grey to provide a minimumdry film thickness of 75 microns.

4th Coat On the external root section to 250mm above ground level,one coat of modified vinyl micaceous iron oxide with highsolids to give a high build coating, coloured grey to provide aminimum dry film thickness of 75 microns.

5th Coat On the external surface overall, one coat of modified vinyl withhigh solids to give a sheen finish to the dried film colour greyfrom BS 4800 shade 18B25 to provide a minimum dry filmthickness of 60 microns.

A line on the circumference of the base section shall denote ground level.

The minimum dry film thickness shall be


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9. Siting of Columns

Columns must not obstruct footpaths or vehicular accesses. They shall besited in accordance with BS 5489 Part 1 and generally be planted in thefootpath at the rear or in the absence of a footpath, a minimum of 0.8 metresfrom the kerb edge to the face of the column and within the highway to beadopted. No obstruction or planting shall hinder access to the column basecompartment or the light distribution from the lantern.

10. Obtrusive Lighting

10.1 Obtrusive light is lighting, which falls outside the area to be illuminated, whichcan cause discomfort, annoyance, distraction, or reduces the ability to see.Obtrusive light is referred to as light pollution which can be divided into threemain categories:

a) Sky Glowb) Glarec) Light trespass

10.2 The obtrusive light should be restricted by:

a) The control of the type of light sourceb) Restricting the level of light emitted at high angles between 70 and 90

d


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open position it shall be attached in such a way that there is no likelihood of itbecoming accidentally detached.

All hinges, toggle catches, captive screws and nuts shall be made of non-corrosive material.

Lanterns shall be reasonably weather and dust-proof and shall be fitted with asuitable gasket between the body of the lantern and the bowl. The IP Ratingof the lantern shall not be less than IP 65.

The means of supporting the lamp shall be so designed that the position ofthe lamp in the lantern relative to any optical equipment remains substantiallythe same under all conditions of service and throughout the life of the lantern.

The optical equipment controlling distribution should include reflectors and/orprismatic refractors and these shall have a smooth exterior surface or beprotected by hermetically sealed cover plates to prevent an accumulation of

dirt and to facilitate cleaning. Refractors wholly within a totally enclosedlantern need not be sealed.

All lanterns shall be fitted with a porcelain terminal block, earth terminal, cableclamp and lampholder ready wired to connector block with heat resisting typecable. Lanterns for use with SON lamps shall be suitable for the operation ofboth the standard and higher lumen output lamps e.g. SON and SONP.

All l t h ll b fitt d ith i t l t l d h h t b i


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Photo Electric Cell Units (PECUs) shall conform to BS 5972 and shall bemanufactured under the QA System and Procedures of BS5750, ISO9002 or

EN29002.

PECUs shall be guaranteed for a minimum life of 6 years from the date ofmanufacture and this date shall be clearly marked on the unit. The Contractorshall replace premature failed units, at no cost, in accordance with themanufacturer' guarantee.

PECUs for mounting at heights of 8 metres and above shall be containedwithin a one-piece transparent or translucent conical enclosure and one-partunits shall be suitable for fixing into a NEMA type twistlock socket. They shallprovide Class 2 protection against electric shock and IP67 against externalelements.

PECUs for mounting at 5 or 6 metre shall be of the miniature type with thedetector fitted to the lantern with conduit thread fixing.

PECUs shall:

a) operate on 220 to 270 volts 50Hz AC and shall be capable of switchinga discharge lighting load of 2 no. 250 watt high pressure sodium lampswith a pre-set switch on level of 70 lux and a negative switchingdifferential of 1:0.5;

b) i t ti d l i it t l t it h d b


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15. Radio Interference

Control equipment shall be designed and installed so that the operation of thelighting installation does not produce an unacceptable level of radio orelectromagnetic interference.

Limits of radio interference given in BS 800 shall not be exceeded. Therecommendations of BS 5489 for the control and suppression of radiointerference shall be adhered to. New equipment shall also meet theelectromagnetic compatibility standard BS EN 50081/1 for emission and BSEN 50082/1 for immunity.

16. Cut Outs and Isolators

16.1 All cut-outs shall incorporate a double pole isolation switch complying with BS5419 having a rating of 32 amps and of adequate short circuit withstand for

the position in the circuit in which it is installed. The isolation switch shall becapable of being positively and visibly locked off by means of a padlock orlocking bar and it shall not be possible to remove the outgoing fuse(s) unlessthe isolation switch is in the off position.

16.2 The cut-outs shall be of the all insulated type with drip proof enclosureaffording a minimum degree of protection to IP22 and have a high mechanicaland dielectric strength. The terminals shall be capable of accepting

d t ith i d l t


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17. Fuses

No rewirable fuses shall be used. All fuses to be HRC to BS88 Part 2operating on 240 volts 50Hz supply. Fuse ratings for lamps shall be asfollows.

Low pressure sodium (SOX) 6 ampsHigh pressure sodium SON 50w to 100 watt 6 amps

SON 150w to 250 watt 10 amps

18. Cables

17.1 Underground cables shall be laid in duct except where they leave the duct toenter the cable slot of the apparatus, and consist of stranded copperconductors, XLPE insulated, PVC extruded bedding, a concentric layer ofsteel wire armour, overall PVC sheathing suitable for operation in an earthed

system and of rated voltage 600/1000 volts at 50HZ, all in accordance withBS 6346 for metric cable, have BASEC approval under the productcertification scheme and produced by a manufacturer who has been awardeda Certificate of Assessed Quality Management, to BS 5750, by BASEC.

17.2 All cores shall be of equal cross sectional area of 6sq mm minimum and be ofsuch a size that the requirements of the current IEE Wiring Regulation, BS7671, are met and allow for a disconnection time not exceeding 5 seconds.


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19.2 Ducts shall be manufactured from low, medium or high density polyethyleneand coloured orange with white, 9 mm high lettering STREET LIGHTING at

intervals of not more than 1m along its length.

19.3 Ducts for street lighting cables under carriageways shall be laid with 750 mmminimum cover and laid on 100 mm bed of Acceptable Material Class 8(Specification of Highway Works) and covered with Acceptable Material Class8 but containing no material greater than 20 mm within 100 mm of the duct.

20. Cable Laying

Joints in underground cables are not permitted and continuous lengths ofcable shall be laid and looped in and out of the terminations.

Cables shall not be laid in a frozen state or when the ambient temperature is

below 0c.

The internal radius of a cable bend shall be such as not to cause damage tothe cable.

For cables not accommodated in 50 mm duct, the trench shall be excavatedto 525 mm minimum depth and the cable laid on and surrounded by a 75 mmthickness of sand or equivalent material. The trench to be back filled withacceptable material to within 150 mm of finished level before laying the cablemarker tape and completing the backfill and finished surface.


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21. Internal Wiring and Distribution Cables

21.1 Columns not directly supplied from Electricity Company supplies shallbe supplied on a sub-circuit from the serviced column by means of thepublic lighting underground cable and looped from column to column.All looped connections shall be made in the bottom terminals of thefused isolator cut-out. The armouring of the underground cables shallbe secured onto the gland plate of the cut-out or have a non ferroussleeve fitted below the armouring and earthing clamps fitted to make apositive grip on the armour wires. The earthing clamps and gland plateshall be bonded to the main column earthing terminal with 10 sq mmsingle core PVC cable.

Typical wiring diagrams are shown in the Appendix (1 to 4).

22. Illuminated Road Traffic Signs

Where it is necessary, all illuminated road traffic signs shall be provided bythe developer and shall be as prescribed in the Traffic Signs Regulations andGeneral Directions 1994, the Traffic Signs (Speed Limits) Regulations andany amendments.

They shall be provided where directed by the Director of Environment andTechnical Services to whom details of any proposals must be submitted for

l


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(c) Sign Lanterns

Sign lanterns shall comply in all respects with the requirement ofSection 4, BS873 and BS1788 where applicable.

The lantern for overhead illumination of plates up to 750mm diametershall house one PL11 watt compact fluorescent lamp. The unit shall bemanufactured from LM6-M cast aluminium and incorporate a fullydetachable gear try and alloy frame supported polycarbonate lens thatpivots or hinges downwards leaving the signlight canopy in tact andproviding weatherproof protection to the electrics and lighting unitduring maintenance operations. The sign lantern and bracket shall beas manufactured by Simmonsigns type LUA or similar approved.

(d) Illuminated Signs on Pedestrian Refuge Islands

Unless otherwise agreed the signs used at such locations shall be of the

demountable type with the installation incorporating cable chambersand post sheaths as depicted on standard detail drawing, Appendix 9.

23. Electricity Supply Services

23.1 The developer shall liaise with the Regional Electricity Company (NorthernElectric) with regard to provision of electricity supply services to the lightinginstallation.


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24. Earthing

The whole of the installation shall be earthed in accordance with therequirements of the current BS 7671, IEE Wiring Regulations, and with therecommendations contained in BS 7430, Earthing. Earthing shall be carriedout in PVC insulated copper cable green/yellow in colour. All metallic parts ofthe ancillary equipment, column, lantern and gear shall be bonded together toform a continuous earth path to the earth stud of the column.

25. Painting

After erection, any areas of damage to the paint protection system shall bemade good by abrading the edges of the damaged areas and coating thedamaged areas with M.I.O. modified vinyl, applied by spray, to give a sheenfinish coloured grey 18B25.

No further site painting of new columns shall be required unless a finish in acolour other than grey is required. Any further finish paint shall be applied tothe overall column and bracket in one continuous flow free coat. All paintingshall be carried out in accordance with the paint manufacturers instructionsand no painting shall be carried out during extremes of temperature or whenthe surface is damp or wet.

26. Electrical Testing of Equipment and Commissioning


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4. Polarity a polarity test should be made and a check to verify thatprotective devices are connected correctly and fuses in the phase

conductor only.

5. Earth Fault Loop Impedance measurements should be taken at thepoint of supply and, where underground cables have been installed, atthe most distant point of each circuit. The values should accord withthose shown in BS 7671 to ensure the circuit protective device willfunction within five seconds.

6. Earth Electrode Resistance tested in accordance with BS 7430 andBS 7671.

7. Operation of Residual Current Device verify by a test simulating anappropriate fault condition independent of any test facility incorporatedin the device. The device shall be tested at 50% and 100% of its ratedtrip current.

8. Voltage Drop measured at the most remote point from the supplyunder full load conditions.

All results shall be recorded and submitted to the Director of Environmentprior to an adoption inspection. The results can be recorded on the formsshown in the appendix or such similar in accordance with BS 7671.

27 Ad ti d M i t


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APPENDIX 1

P.E.C Detector

LN Lo

Lantern Earth Terminal

LAMP

CapacitorPF

Ballast

LoadN1NL

2.5 mm PVC

Lantern Terminal Block

2core with E.C.C


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APPENDIX 2

P.E.C Detector

LN Lo


LAMP

CapacitorPF

Ballast

LoadN1NL

2core with E.C.C2.5 mm PVC



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APPENDIX 3

P.E.C Detector

LN Lo


LAMP

CapacitorPF

Ballast

LoadN1NL

2core with E.C.C2.5 mm PVC



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APPENDIX 4

P.E.C Detector

LN Lo


LAMP

CapacitorPF

Ballast

LoadN1NL

2.5 mm PVC


2core with E.C.C


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LC3

LC4

LC5

LC6

LC7

LC10

LC9

LC8

LC11

LC12

S1


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1250mm

9

00mm

MinimumWidth1

800mm

IP67 udergroundwaterproof GRP

junction box

Inspection chamber lid 275 x 285mm,

with stainless steel fixings. (Must be

installed flush with the surface)

Pedestrian island to consist of 125 x 255mm

half-batter kerbing with 125mm upstand.

Kerb upstand to be painted white.

0.75mm 3 core TRS flexible cable

& 6m Green/Yellow earth bond

100mm Cross C/way duct

100mm cross carriageway duct to be installed to

Drawing No. HMS/05/28 to terminate in extension box.

Single sided, illuminated sign to Diag 610, size dependant on Table A ofthe Traffic Signs Manual, Chapter 3. Mounting height to be 900m with a minimum of

500mm lateral clearance. Sign face to incorporate translucent reflective material.

76mm diameter pre-galvanised and slot cut post. Post legth dependant upon mounting

height. Colour as scheme/ works order.

Safety end caps must be installed flush with the surface.

IP67 underground waterproof GRP junction box, fixed to side of chamber.

Reinstate bituminous

bound carriageway

Insitu concrete mix ST4 infil

to traffic island maximum

depth 125mm.

Demountable Unit with bellmouth

entry on adjacent refuge with

500 x 500mm concrete surround


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PUBLIC LIGHTING INSPECTION AND TEST REPORT FOR DURHAM COUNTY COUNCIL INTERNAL WIRING TOCOLUMN / SIGNS

Site Location : Developer : .

Electricity Supply Point : ... Circuits : .

Earthling System : ...

.

.

CircuitNo

CircuitFuse

Rating

VisualInspection

Satisfactory

Insulation Resistance (m Ohms) Test VoltsEarth Fault Loop

Impedance(ohms)

Volt Drop

R-B R-Y Y-B R-N Y-N B-N R-E Y-E B-E N-E SourceRemote

EndSource

RemoteEnd

Date of Test : ... Drawing Number : ..

The above Installation has been inspected and tested and at the date of the test the results shown above proved satisfactory

Signed :

For and on the behalf of : Date : ..

8


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PUBLIC LIGHTING INSPECTION AND TEST REPORT FOR DURHAM COUNTY COUNCIL INTERNAL WIRING TOCOLUMN / SIGNS

Site Location : . Developer : .

UnitNumber

FuseRating

SystemEarthing

Type

SupplyControl Unit

VisualInspection

Satisfactory

EarthContinuity

(ohms)

Insulation ResistanceMohms

PolaritySatisfactory

Earth Fault Loopimpedance

(ohms)L / E N / E L / N

Date of Test : ... Drawing Number : ..

The above Installation has been inspected and tested and at the date of the test the results shown above proved satisfactory

Signed :

For and on the behalf of : Date : ..

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July Specification- Street Light Design