Underground Cable Installation Manual Part II
Contents
1. te OO e 6 6 2 SAFETY IN PITS AND PRENCHES tetigit aie ede ta vel 6 6 3 WORKING IN THE PROXIMITY OF OVERHEAD POWER LINES AND INFRASTRUCTURE 7 6 4 WORKING IN THE VICINITY OF 7 T AVOHKPEANNING iii tbt etae etatis 8 7 1 RESPONSIBILITIES 8 7 2 PLANNING AND RISK ASSESSMENT 20 202 2 212422424000000000000000000000000000050050000 8 7 3 NOTIFICATION OF PROPOSED WORKS 2 2 1 000000000000000500 8 7 4 PARTICULAR REQUIREMENTS RELATING TO CBD WORK 8 8 SURVEYING AND AS CONSTRUCTED RECORDS 10 8 1 SURVEY BENCHMARKS AND DATUM enne enne nennen enne 10 8 2 AS CONSTRUGTED RECOBDS etii etre e tenete to lide cedes Pile tio eo Da beg 10 9 ENVIRONMENTAL AND ABORIGINAL 11 91 ENVIRONMENTAL AND ABORIGINAL 1865 68 40 21122 201 2 4 0000000 000000000000 11 10 CROSSINGS 12 AREA e 12 10 1 1 Installation of Ducts and 12 10 1 2 Installation of dit tee herren entrer 122. 00 004 00600 23 15 2 CORE ARRANGEMENT eee rre eb ela ree 23 15 3 68 24 154 GABEEMABKING eet eee 25 15 4 1 Above Ground Cable 5 25 15 57 SGPS COORDINA TES 26 16 CABLE LAYING 12 ev 27 16 1 DRUM INSPECTION AND MOUNTING reete ess eate nen 27 16 2 DRUM POSITIONING 27 163 PROTECTION OF CABLES FROM 27 164 CABLE PULLING TENSIONSG ccccccccssscssscscscssssssscsssssssssssssssssssssssssssssssssssssssssssssssssssessseseaees 28 16 5 JPUELING SPBED x facies cetero aT odd 28 16 6 CABLE BENDING 0 0 000 b p 28 16 7 LAYING TO POLES documents erbe cha erede Dre Foto 28 16 8 BEDDING AND BACKFILL eeeeeeetennrn e n nen nnn nnn nnn nnn nnn a a n saa a asa a a a s saa a s pasas aaa 29 16 9 DEPTH OF COVER OF CABLES i oot eee ete teo cete Cete ep ee beo eee N eee faces Cun esee
3. 1 avis 83 02 TIHVJ 318V2 LHOIT 15 318Y2 AH 318VJ AT NYS NYIN 1 YFONVE us dI Al 318 2 830434 dr 318v 9 YIWYOISNVYL Le QNVS NYJ D LInQNOJ 15131 045040844 SNOISN31X3 SATIVA LNVYGAH 3413 15 NH31S3M LINQNOQ M 2 Win 5 Q NOJ T3A31 12 48 5 3HSINIJ E IN3ANDITV NO LIN3W3DNVHNHV 3182 1921941 AYVONN 08 Al83d08d 3 83538 OVO JIILIVYd 40 3002 5930 ALTIILA JHL 40 NOILIQ3 JHL Ol 43434 SNOILVOOTIV 3 44538 0 04 DRAWING 2 lt z Lu gt Lu 2 Western Power NETWORK ENGINEERING BRANCH SHEET 1 OF 1 REVISION DATE UDS EQUIPMENT DRAWIINGS 24 01 02 TRENCH DETAILS C DSB 95 3 Page E 1 DM 3399230 word version Appendix F Drawing UDS 6 4 DIAGRAM SHOWING PLACEMENT OF CABLE AND DUCTS FOR ROAD CROSSINGS Kerb Line Property 500 E WPC 0 500mm alignment For service cable and street light cables the duct must be installed from edge to edge of the cable alignment E lt 0 500mm alignment Kerb Line Duct 1000mm CONI E 1 Property Boundary 1 For and LV cables with larger bending radius
4. 18 12 9 EASEMENIS uentrem te etel ced tete redu 18 12 3 GREENFIELD COMMON 2 2 1 2 0020 000010000000000000000000 2 18 124 RETROSPECTIVE caves 18 13 TRENCHING AND 19 19 13 2 EXCEEDING EXTENT OF EXCAVATIONS 2 0 000 19 133 USE OF ROCK BREAKING 0 0 2 02 20 2 20020000000 00 19 13 42 SBISAS TING hte We edt oct 19 13 5 a nid ena e Wee ede eee 20 14 DIRECTIONAL DRILLING 22 21 14 1 DRILEED TUNNELS 21 14 22 DIGGING ENTRY AND EXIT 20 220000 0000000 0 04 21 14 3 PROTECTION OF CABLES IN SPECIAL TERRAIN 4 21 B RITIGING A EA uela doeet etu 21 14 5 DRILLING FLUIDS MANAGEMENT 22 15 PEOUGHINQ 3 23 15 1 CAPABILITY OF PLOUGHING
5. It is the ASP s responsibility to identify all front boundary pegs prior to commencing excavation 12 4 Retrospective For retrospective underground areas where the standard cable alignment is not practically available the cable centre line shall be on the pole and trees alignment of 2 7m from the property line plus or minus 100mm The identification of the correct property line is the responsibility of the ASP and if there is any doubt as to its correct location the ASP shall obtain directions from the relevant authority Where the poles and trees alignment is not available special arrangement will need to be determined DM 3399230 word version Page 18 13 Trenching and Excavation 13 1 General The ASP shall excavate the trenches to a width sufficient for satisfactory and safe working conditions and shall comply with all relevant Acts Regulations and requirements of public or statutory authorities The ASP shall excavate as necessary to provide the specified minimum cover but so as to avoid damage or loss of support to obstacles such as pipes drains cables and other utilities and services The ASP in general shall restore the area to be excavated to its original condition when the excavation is complete All excavations shall be completed in a timely manner to minimise disruption to all parties The ASP shall provide all materials required for the excavation including but not limited to pumping equipment shoring backfill
6. Cable Markers Danger Label Warranty Label Depth Marker Hole Asset Protection Mark BIS Black Line Depth Marker Line Retention Barbs Figure 5 Above Ground Marker Ezy Drive Flexible Type CR0328 is the correct installation tool needed for installation of the above ground marker For ploughing purposes the above ground marker would be installed to the depth marker hole illustrated in Figure 5 such that depth below ground is 600mm and depth above ground is 1000mm 15 5 GPS Coordinates The cable route shall be mapped by onboard GPS technology offered by the cable ploughing contractors During the cable run the GPS coordinates shall be monitored and noted these GPS coordinates shall then be plotted and supplied with the as constructed drawings DM 3399230 word version Page 26 16 Cable Laying 16 1 Drum Inspection and Mounting Upon delivery the cable drum should be visually inspected for damage which may have occurred during transport The manufacturer s seal on the inner and outer cable ends should be examined and the condition of armouring serving and sheath inspected for mechanical damage corrosion and leakage of impregnating oil If the cable is found defective it shall not be installed and the cable shall be returned to the supplier for replacement During installation the cable should be carefully examined for any sign of damage as it lea
7. etc The equipment must be provided for the entirety of the project 13 2 Exceeding Extent of Excavations Excavation in excess of that specified for the laying of the cables shall be made good at the ASP s expense In the case of excessive excavations approved sand filling for the bottom of the trenches shall be used 13 3 Use of rock breaking equipment Rock shall mean limestone cap stone ironstone igneous rock and concrete etc which occurs in solid masses or any other material that cannot be practically excavated by a backhoe type machine or bored using an approved boring machine 13 4 Blasting On occasions blasting operations are undertaken as an aid to excavation in rock limestone and clay Blasting shall not be carried out within the road reserve where other utilities are in close proximity and blasting will affect their equipment All explosives handled in the course of blasting operations shall be carried out under the direct supervision of a licensed shot firer in accordance with all relevant Acts and Regulations including the Explosives and Dangerous Goods Act 1961 and the Explosives and Dangerous Goods Explosives Regulations 1963 Blasting must be on a very limited scale in built up areas and should only take place after all nearby buildings have been thoroughly inspected photographed if required and recorded Adequate warning signs must be displayed and all precautions against flying material taken by the use of p
8. 2m 3m 4m 5m 1011 111 1 1111 i prag 111 LI Li Power Communications Gas Water Power Poles Communication Main Trunk Services 450mm Trees amp Street Conduit or Stormwater top Lights or Sewer 750mm top D 1 I e a TG 500mm 800mm 500mm 600mm 600mm 750mm CL Telstra 1500mm C L 2100mm C L non variable variable L non variable Property 500mm 1300mm 1800mm 2400mm 3000mm Carriageway Mine 5000mm Omm Note The minimum depth of cover of cables is 750mm However the depth of cover of cables in nominal cable alignment shall be increased as required so that cables joints will have the necessary depth of cover Cable Alignment and Depth Greenfield Developments DM 3399230 word version Page A 1 Appendix Cable Installation Data Type of Cable Voltage Noof Cable Conductor Reel Nominal Maximum Minimum Bending kV Cores Size Material Length Overall Pulling Radii mm m Cable Tension Bundle One Cable Diameter per core mm for HV kN Installing Installed mm mm Transformer Cable 33 3x1 50 Al 250 82 1 47 1000 480 850 410 HV Feeder Cable 33 3x1 95 Al 250 94 4 74 2330 1110 1400 670 Feeder Cable 33 3x1 185 Al 250 102 5 20 2596 1185 1557 715 Transformer Cable 12 7 22 3x1 35 Al 250 68 3 48 1710
9. 6 7 8 9 13 and 15 and special requirements for built up areas Where the subdivision requires equipment to be installed on public land the public land installation section only is subject to the requirements of the UCI manual The UCI manual does not apply to the items installed within the subdivided land Public land is land that at the time of subdivision is freely available for public use e g existing road reserves POS PAWS etc DM 3399230 word version Page 2 5 1 General Definitions Accredited Service Provider ASP Approved CBD Cable Conductor Construction Manager CM Contractor De energised Earthed Energised High voltage DM 3399230 word version means a person or an entity who has been accredited through the accreditation scheme of Western Power to undertake any construction work on WP s underground network means having appropriate organisation endorsement in writing for a specific function means central business district means an insulated conductor or two or more such conductors laid together whether with or without fillings reinforcements or protective coverings High voltage cables used by WP are normally un armoured single core XLPE insulated earthed screen cables which may be bundled in twisted trefoil for three phase use The outer jacket is extruded HDPE with typically 2mm thickness Low voltage cables are usually three core XLPE insulated with a concentr
10. Work instruction Other Documents That Reference This Document Title Of Document DM 3384127 Western Power Underground Distribution Schemes UDS Manual Stakeholders people to be consulted when document is updated Position title Asset Performance Pole and Tower Performance Network Planning and Standards Network Standards and Technology Work Practice Development amp Training Work Practices Development Notification List people to be notified when document is updated Position title Asset Performance Pole and Tower Performance Network Planning and Standards Network Standards and Technology Work Practice Development amp Training Work Practices Development This document must not be made available to personnel outside Western Power without the prior written approval of Western Power 2 1 DOCUMENT CONTROL 2 2 CONTENTS Rn odes idee LN E 4 PURPOSE danda oi eh tite asd tiic 1 APPEICATION O uitio a uL E LU Lire 2 sac iic UE 3 5 1 8 8 ett ter b De bs eee et esteso 3 52 RELATED INFORMATION ede eere eie A AL e er e ORO REO EN 5 6 GENERAL UNDERGROUND INSTALLATION REQUIREMENTS 6 6 1 GENERALE
11. may result because of the hazard e Decide on control measures to prevent or minimise the level of the risks e Implement control measures e Particular attention shall be given to but is not limited to o Traffic management Refer to Main Roads Dept Code of Practice on the MRWA Website and also Section 5 4 for particular requirements in congested traffic areas such as the CBD o Public and worker safety Potential weather conditions during the work 7 3 Notification of proposed works The ASP shall notify MRWA the local shires and councils and affected public at least five day prior to commencement of work 7 4 Particular Requirements Relating to CBD Work Where excavation work is to be carried out the following factors shall be taken into consideration when pre planning the job This shall be prepared and submitted to the local authority by a person accredited by the MRWA DM 3399230 word version Page 8 All work shall be done to minimise the interruption to local business and allow continue access to businesses for trade The hours of work may be restricted depending on the possible noise pollution created from the excavation works Some councils will not allow mechanical excavation work in footpaths e g City of Perth The ASP will need to check with the local Council DM 3399230 word version Page 9 8 Surveying and As Constructed Records 8 1 Survey Benchmarks and Datum Points There may be
12. of any road reserve are broken to any particular extent without prior approval of WP s Representative no payment will be made to the ASP and the ASP will be charged with the restoration costs incurred by Western Power Where cement footpath slabs have been removed to allow cable trench excavation they will be replaced and reinstated in accordance with the Local Council s requirements unless otherwise directed by the WP s representative DM 3399230 word version Page 33 19 Damage to Property 19 1 General In built up areas property or services damaged by the ASP shall be repaired or replaced at the ASP s cost or at the cost of developers in the case of subdivision development as soon as possible after making safe Fences around areas holding livestock shall be secured at all times and if damaged during construction shall be repaired or made safe immediately to prevent the stock from straying The ASP shall be responsible for the cost of repairing any damage to reticulation systems and underground services that are disturbed or damaged in the performance of the services and for restoring them to working order Trees planted in the road verge shall be protected as far as possible Tree limbs interfering with the construction shall be removed appropriately by pruning and sealing and the trees left in a reasonable condition The ASP is required to inspect any structures located along the cable trench route and shall make arrangem
13. official survey benchmarks installed in the project work area The ASP shall take all necessary precautions to avoid disturbing these markers Should any markers be disturbed by the ASP it will be responsible for all costs associated with restoring the benchmarks to their correct position 8 2 As Constructed Records Upon completion of all work the ASP shall provide the CM with the following As Constructed records e Cable installation record Where cables are installed using directional drilling the length and depth of cables shall be recorded e Electrical test schedules e HV cable joint schedule Materials amp equipment schedule The As Constructed records shall meet the requirements of Section 6 2 4 7 of the Underground Distribution Schemes Manual which is available at Standard forms for Electrical Test Schedules HV Cable Joint Schedules and Materials amp Equipment Schedule are available for download from Western Power s web site DM 3399230 word version Page 10 9 1 Environmental and Aboriginal Considerations Environmental and Aboriginal Issues Environmental and Aboriginal impacts must be investigated and managed Issues may include but not limited to the following Declared Rare Flora and Threatened Ecological Communities protected by State and Federal Law Biosecurity Weeds Pests and Disease Spread e g the spread of Dieback Disease Vegetation Clearing Permit from Department of Environme
14. pinch the cable whereas a loose cleat may allow excessive cable movement 11 4 Tunnels Where tunnels are to be used the construction and installation requirements will be included on the design drawings DM 3399230 word version Page 17 12 Cables and off Alignment 12 1 Cable Alignment Cables shall be installed in Western Power s standard alignment in accordance with the Utility Providers Code of Practice for Western Australia and Drawings No UDS 6 1 shown in Appendix E Cables can only be installed off the alignment with WP s approval and other affected utilities written agreement Other services shall not be installed in the power cable alignment without written permission from Western Power 12 2 Easements Where cables HV and LV are installed outside the standard alignment or on locations other than road reserves which includes private property POS or PAW they shall be protected by surveyed easements Two classifications for underground distribution easements exist and one of these will be selected and documented in the design file 1 Through the WAPC process easements are applied under Section 167 of the Planning and Development Act 2005 2 Cables requiring protection outside this process will need to register the easement under the Energy Operators Power Act 1979 For subdivision developments developers must comply with the requirements of UDS Manual 12 3 Greenfield Common Trenching
15. requirements for water reticulation shall be in accordance with Water Corporation requirements e All reticulation shall be laid within plus or minus 100mm of the indicated centre line and secured against movement with initial backfill 10 3 Gas Mains Where work is required close to the gas transmission system the ASP must contact the pipeline owner before any work commences refer to the Dial Before You Dig Service in Appendix C When excavating within 20m of a high pressure gas line the ASP must ensure that a safety observer from the pipeline operator is on site during the work Whenever hot work is being carried out in a trench or excavation which includes a gas main the ASP must notify the pipeline owner before work commences Hot work includes welding naked flames grinding and etc In some country areas such as Mandurah and Albany a different gas mixture which is heavier than air is used If any work is carried out in a trench adjacent to a gas main in Albany or the Vines Area the ASP must notify the gas pipeline owner of the work location DM 3399230 word version Page 13 10 3 1 Plastic and Steel Pipes When carrying out hot work involving a naked flame in the vicinity of an exposed gas pipe a minimum separation distance of 600mm must be maintained from the gas pipe to the flame If this is not possible assistance must be sought from the pipeline owner concerned A fireproof blanket or barrier must also be placed bet
16. shall be smoothly and continuously applied When stocking grips are used to install un armoured cables the maximum recommended pulling tensions are shown in Appendix B The trench or duct line should be set out so that any necessary deviations from a straight line occur over the largest possible radius When pulling cable into duct lines incorporating bends lower maximum pulling tensions may be necessary to avoid the wire pulling rope cutting into the side of the duct Any winch used to pull cables shall have either a facility to automatically limit the pulling tension applied to a cable or a continuous reading dynamometer incorporated in the pulling arrangement to enable the actual pulling tension to be monitored Cable pulling pits are required at each significant change in cable route direction The pits will be indicated on the design drawing 16 5 Pulling Speed To avoid damage due to overruns the cable should be pulled just fast enough to keep the drum rotating smoothly Higher speeds are possible when pulling small cables into straight trenches or ducts with good conditions at the feeding and pulling ends Drums with long lengths of cable however should not be rotated rapidly as overrun can cause cable damage if pulling is slowed or stopped suddenly 16 6 Cable bending Radii The permissible bending radii of all cables are given in Appendix B No twists knots or kinks are permitted Where a 3x1 core HV cable is to be laid
17. that pulling tension is not excessive otherwise sheath stretch may result Nose Pulling The strength of the cable sheath limits the length and size of the cable that can be pulled by stocking pulling For long and large cross section cables pulling eyes can be fixed directly to cable conductors for pulling the cable Bond Pulling When pulling tensions exceed the tension limit of the cable straight end pulls may have to be replaced by bond pulls The cable is lashed to a steel wire rope which takes all the strain of the pulling DM 3399230 word version Page 31 18 Reinstatement 18 1 General In built up areas the ASP shall restore the excavated land to its original condition Backfilling and reinstatement of road verges and vehicle crossings as necessary shall be completed within three working days from the time the cables are laid and jointed Road reserves and all work sites shall be levelled and left clean and tidy Debris trees stumps and excess soil dug from the excavation shall be removed from site when finished trench backfilling All materials stakes plant and equipment used during installation shall be removed by the ASP and all work sites left in a safe condition The initial backfill over the bedded cables shall be carried out in accordance with Section 14 8 Bedding and Backfill Trenches shall be subsequently backfilled reinstated compacted to their original level and or in accordance with that requi
18. to transformers or switchgear the three twisted cores can be separated into three individual cores to reduce the minimum bending radius required The bending radii are given in Appendix B 16 7 Laying to Poles Where cables are to be laid to termination poles a complete loop shall be buried on the property boundary side of the pole to allow sufficient slack for future replacement of the pole or failed cable termination The loop shall have a radius not less than the maximum DM 3399230 word version Page 28 being the radius of the cable The cable shall be protected by cable slabbing and marker tape around the loop 16 8 Bedding and Backfill Cable shall be bedded in clean sand which shall extend 100 mm around the cable Backfilling shall comply with the published Subdivision Design Guideline Number 4 Bedding Sand and Backfill Around Cables and General Backfill for Cable Trenches materials Selection Guidelines All cables shall be firmly and uniformly bedded on sand free from rocks or other hard formation The cable shall be surrounded with a thickness of sand prior to backfilling bottom by 150mm and two sides by 100mm top by 300mm as shown in drawing UDS 6 1 in Appendix E The upper 300mm of the backfill shall also meet the local government authority s requirements 16 0 Depth of Cover of Cables The depth of cover of cables shall not be less than 750mm However the depth of cover of cables in nominal cable alig
19. 10 1 3 Installation of power cables under tracks and elsewhere on railway property 13 10 2 PIPES ORC ABLES de e ain 13 10 27 Existing Pipes or ee he te rete e Lees tee tte tee tee edet 13 10 3 0S MAINS edicti Qeon isse 13 10 3 1 Blasauc and Steel 1 irte eo ete e te Di sene 14 10 52 and Old Steel Pipes ee edu cea et e ide efte eel 14 teer ete eite ee dee Re ARE ind 14 10 5 OTHER ELECTRICITY SERVICES 14 10 6 ROAD AND VEHICLE 551 4 000020 00001000000000000000005050 15 10 7 HORIZONTAL CABLE CLEARANCE TO OTHER SERVICES AT ROAD CROSSING 16 11 CABLE TUNNELS AND SUPPORT SYSTEMS 17 GENERAL 17 2 JXCOESB PITS 17 11 3 17 Teas TUNNELS ahd 17 12 CABLES ON AND OFF ALIGNMENT 18 12 GABLE ALIGNMENT
20. 790 1025 475 HV Feeder Cable 12 7 22 3x1 185 Al 250 93 5 40 1700 780 1400 520 HV Feeder Cable 12 7 22 3x1 240 Cu 250 98 7 84 2465 1125 1480 675 HV Feeder Cable 12 7 22 3x1 400 Al 220 109 7 32 1635 1200 1090 720 LV Feeder Cable 0 6 1 1x3 120 Al 250 39 5 20 700 470 LV Feeder Cable 0 6 1 1x3 185 Al 250 47 7 70 850 570 LV Feeder Cable 0 6 1 1x3 240 Al 250 54 10 00 970 650 Service 0 6 1 1x3 25 Cu 250 26 3 10 160 105 Street Lighting 0 6 1 1 10 Cu 1000 11 0 70 70 48 Street Lighting 0 6 1 1 16 Cu 1000 14 1 10 80 55 Note The ASP shall obtain and verify the cable installation data from the cable manufacturer DM 3399230 word version CABLE INSTALLATION DATA Page B 1 Appendix Dial Before You Dig Service General Dial Before You Dig Service sometimes referred as One Call System provides a single statewide point of contact between excavators and major utilities which own buried pipes and cables as well as the owners of other buried services This free service makes it safer and easier for people undertaking excavation activities The following information will help you make the best use of the Dial Before Your Dig service Simply dial 1100 at least two working days in advance of your intention to excavate A number of questions will be asked Enquiries may also be lodged by facsimile 1300 652 077 Internet http www dialbeforeyoudig com au This information is needed to clearly identify the precise loca
21. Network Standard NS 14 2 2006 UNDERGROUND CABLE INSTALLATION MANUAL Part Il Technical Requirements s amp t westernpower Original Issue April 2006 Prepared by Kwok Ng This Revision C Date for Next Review September 2016 2015 Western Power ABN 18540492861 THIS DOCUMENT CONTAINS COMMERCIALLY SENSITIVE DATA AND INFORMATION AND IS STRICTLY CONFIDENTIAL IT SHOULD NOT BE PROVIDED OR DISCLOSED TO THIRD PARTIES WITHOUT FIRST CONSULTING THE GENERAL MANAGER 1 Document Control Endorsement Approvals Name Prepared by Chris Omodei Senior Distribution Engineer Checked by Grant Stacy Engineering Team Leader Lines amp Cables Design Approved by Charles Crew Lines amp Cables Design Manager Record of Revisions DM Revised number version by Original April 2006 Issued on the Web April 2007 Incorporating additional requirements and UDS drawings DMS 3399230 December Clarissa Added cable ploughing as an approved Van Der cable installation method for Heijden underground cables August Updated 16 11 Cable Sealing added 2015 Chris 16 12 Exposed Underground Cables Omodei updated links updated Appendix D pdated format Documents Referenced In This Document REFERENCE TITLE OF DOCUMENT DM 3384127 Western Power Underground Distribution Schemes UDS Manual DM 10701697 Western Power Network Standard NS 11 2013 Distribution Commissioning
22. OVAL AND DISPOSAL OF SURPLUS MATERIAL 32 18 5 RESTORATION OF SURFACE yearn a a E E R Ea E E a aiae 32 19 DAMAGE TO 34 194 GENERA 34 20 PILLARS amp PITS 35 20 1 GENERAL 3 Purpose This manual UCI manual formalises the requirements for the safe and efficient installation of all underground cables on the Western Power s distribution system The policies specifications procedures and guidelines contained in the UCI manual detail the technical requirements to be followed by Accredited Service Providers ASPs and also act as a reference to clearly establish defined standards for auditing and assessment work DM 3399230 word version Page 1 4 Application In general all Western Power WP staff and ASPs involved in the installation of high and low voltage distribution cables on the WP network must comply with this manual However for subdivisional work which is managed by a developer and the subdivision does not require equipment to be installed on public land some of the items in the UCI manual are not applicable as they are covered by the UDS manual The Sections and items that are not applicable for subdivisional work that is managed by a developer and does not require equipment installed on public land are Sections
23. able route in order to mark the location of cables as per Table 1 The exact placement of above ground cable markers will be left mainly to the judgment of the field staff but the following basic guidelines should be used Road Crossings Steel markers are to be placed at both sides of the road Boundaries Wherever the cable route enters exits a boundary line i e road reserve property boundary etc a cable marker should be placed as close as is practically possible to the cable installation Paddocks and Open Spaces When markers are used in open areas they should be placed to minimise the possibility of damage to or from livestock or machinery It is preferable to keep the cable installation close to fences and or boundaries so markers do not have to be installed in open paddocks When a cable has to be run through paddocks or open spaces markers should be placed on the fence line or boundary Distances between markers Any change in direction of the cable route shall be marked if the cable deviates from the straight line route DM 3399230 word version Page 25 From any cable marker you should be able to see the adjacent markers both in front and at the back Even where visibility between two cable markers is satisfactory a maximum distance between markers shall be 150m The approved above ground cable markers for ploughing is the ezy drive flexible steel post stock code CR0327
24. affected area for inadvertent return of drilling or hydraulic fluids e Measures to adequately clean up of surface seepage of drilling fluids and spoils DM 3399230 word version Page 22 15 Ploughing Ploughing technology allows cables to be ploughed into the ground with an envelope of clean backfill sand this presented Western Power with the opportunity to re visit cable ploughing as an approved method for installing underground cables Refer to below sub sections for design detail when choosing cable ploughing as the installation method for underground cables Please note that Western Power will not accept any cable to be installed directly into soil without an envelope of clean backfill sand when ploughed 15 1 Capability of Ploughing Equipment Ploughing equipment has the capability of installing cables in various arrangements i Three 3 single core cables not twisted in flat or trefoil triangular formation refer to Figure 1 and Figure 2 below Triplex twisted The three 3 single core cable arrangement allows Western Power to get longer lengths of cable in this manner resulting in a longer cable run Longer cable runs results in fewer joints to be introduced into the western power network resulting in a more cost effective installation Installation time cost and the logistics will also be a great advantage when opting for three 3 single core cable installation over the other various arrangements Installati
25. and which is assessed as a Suitable step in the process of making safe for access purposes means energised or subject to hazardous induced or capacitive voltages means all work performed on components of electrical apparatus not isolated proved de energised and earthed means nominal voltage exceeding 50V or 120V but not exceeding 1000V ac or 1500V dc means not posing an unacceptable risk to life health or property means a person competent for the task and specifically assigned the duty of observing and warning against unsafe approach to electrical apparatus or other unsafe conditions is to be interpreted as mandatory is to be interpreted as advisory or discretionary Single Phase Underground Rural Supply means a potential difference between conductors or between conductors and earth also called Liaison Officer or Construction Manager means the officer appointed by WP as it s representative to whom all site contractual and technical matters are referred High Density Polyethylene High Voltage Low Voltage Public Transport Authority Public Access Way Page 4 POS Public Open Space MRWA MAIN ROADS WA WAGR Western Australian Government Railway WAPC Western Australian Planning Commission UDS Manaul Underground Distribution Schemes Manual XLPE Cross linked Polyethylene 5 2 Related Information Utility Providers Code of Practice Main Roads WA Restoration and Reinstatement Specifi
26. cation for Local Governments in Western Australia Published by the Institute of Public Works Engineering Australia available from Main Roads WA s web site Western Power Underground Distribution Schemes UDS Manual Western Power Network Standard NS 11 2013 Distribution Commissioning Work instruction Western Power s Environmental Policy Accredited Service Provider Accredited Contractor of Western Power Dial Before You Dig Service for lodging an enquiry and requesting a plan Traffic Management for Works on Roads Code of Practice Main Roads WA WorkSafe Code of Practice Excavation Occupational Safety and Health Act 1984 and Occupational Safety and Health Regulations 1996 Explosives and Dangerous Goods Act 1961 and Explosives and Dangerous Goods Explosives Regulations 1963 AS NZS 3000 Australian New Zealand Wiring Rules AS1742 Manual of uniform traffic control devices Australian Standards AS4799 2000 Installation of underground utility services and pipelines within railway boundaries DM 3399230 word version Page 5 6 General Underground Installation Requirements 6 1 General All works must be carried out to meet the requirements of WorkSafe and in compliance with the Occupational Safety and Health Act 1984 and the Occupational Safety and Health Regulations 1996 Operations associated with any task must cease if the safety of workers or the public cannot be assured 6 2 Safety in Pits and Trenches All pit
27. ck logs fed by this information The tracking method may be by walkover wireline or wireline with a wire surface grid The tracking system shall provide information on e Clock and pitch e Alignment and Depth Position x y e Azimuth where walkover is not possible The bore logs shall show depth and bore position from a known boundary every 3m along the bore line These records shall be made available to WP electronically as a permanent record To prevent collapse of the borehole drilling mud or similar rather than just water shall be used for both drilling and back reaming operations The pilot hole shall be reamed to provide free sliding of the cable or conduit inside the borehole DM 3399230 word version Page 21 Drilling back reaming speeds and fluid flow shall be set so spoil is removed without putting unacceptable pressure on the surrounding soil e g surface humping Pull back tension shall be set so as not to stretch the cable or conduit beyond it s design limit See Appendix B for maximum pulling tension for various cable sizes 14 5 Drilling Fluids Management Plan A drilling fluids management shall be completed for directional drilling work This shall contain the following e Method of slurry containment e Method of recycling drilling fluids and spoils if applicable e Method of transporting drilling fluids and spoils off site e Drilling fluid pressures e Measures to contain and clean the
28. ding pole mounted substations and high voltage switches as there are often earth grids and bare wires buried in the vicinity of the equipment o Underground earthing conductors may also have been installed adjacent to certain other poles and structures o If any unrecorded underground cables conduits or bare earth wires are exposed work in the vicinity must cease and WP must be notified immediately 10 6 Road and Vehicle Crossing All cables crossing roads and vehicle crossovers shall be installed in cable ducts Road crossings shall be installed e perpendicular to property street boundaries and e at significant points e g common property boundaries or intersections For service cables and streetlight cables the ducts shall be installed from edge to edge of the cable alignment to as practically close to the termination point For cables with a large bending radius road crossing ducts shall extend a minimum of 1000mm into the roadside verge from the kerb line and as practically close to the termination point Cable covers shall be installed in the gaps between the end of ducts and the edge of cable alignment The above requirements are shown on drawing No UDS 6 4 in Appendix F DM 3399230 word version Page 15 Where roads and vehicle crossings already constructed thrust boring can be used to install the required ducts 10 7 Horizontal Cable Clearance to other Services at Road Crossing All cables and ducts cross
29. e rope to the Z end and pull through any slack cable that appears Pulling through Z end prevents buckling and possible damage to the inner coils on the drum 16 2 Drum Positioning Cable drums shall be positioned in line with the direction of cable pull 16 3 Protection of Cables from Damage Cables being drawn into place shall be kept clear of abrasive surfaces by suitable means e g rollers cable tiles etc to prevent any damage to the cable sheath The cable must be placed in the trench without sustaining abrasion damage and without allowing rocks etc to fall into the trench If the cable is hand flaked directly from cable drum or coil into final position or other method that does not drag the cable over ground cable rollers are not required DM 3399230 word version Page 27 long cable runs where a cable changes direction both horizontal and vertical rollers shall be used to ensure a smooth pull and avoid damage to the cable Cables which are pulled into position by a winch must use suitable cable stockings and swivels to prevent damage When laying cable by directional drilling it is essential the cable is not dragged over ground outside the drill hole or prepared trench since abrasion is likely to damage the outer jacket and cause sheath faults 16 4 Cable Pulling Tensions The tensions of the pull shall not exceed that specified by the manufacturers for the particular type and size of cable being pulled and
30. egged or weighted blasting mats or similar aids DM 3399230 word version Page 19 In open country it is possible to make maximum use of explosives With shallow trenches up to 2m deep the ground can often be broken up to its full depth in the one operation In deeper trenches benching would have to be undertaken It is important that all drilling for blasting be carried out as quickly as possible and extraneous matter is cleared soon after to avoid entering drill holes It is good practice to temporarily plug drill holes prior to charging If extraneous material is allowed to enter drill holes the amount of charge possible in each hole will be reduced thereby diminishing the force of the explosion and fragmentation of the rock The ASP shall pay for any damage or injury caused by blasting 13 5 Excavated material In built up areas where permitted by the relevant authorities the ASP shall where practicable neatly stack reusable top layers of material such as lawns pavers etc on one side of the trench and shall stack the bottom layer of soil separately on the opposite side of the trench Some councils require all excavated materials to be removed from site to enable continued pedestrian access without having to walk on the road Unsuitable soil may have to be disposed of and graded backfill brought in No excavated material shall be placed on or encroach on private property In built up areas cover excavated soil with tarpaulin
31. enclosed in an appropriate Category A system in accordance to AS NZS 3000 2000 The top of the encasing pipe or conduit shall be at a depth of not less than 2000mm below the top of rail and shall be maintained at this depth for not less 3000mm beyond the outer rails when measured at right angles to the track AS 4799 2000 Clause 6 4 2 1 unless otherwise stated in the approved design Power cables passing elsewhere on the property of the PTA shall be laid according to AS 4799 2000 Clause 6 4 2 2 and at a depth of not less than 1000mm below ground level or at the same depth below the level of drain inverts they may cross unless otherwise stated in the approved design Where specified by the PTA the cables shall also be enclosed or covered by protective slabs 10 2 Pipes or Cables 10 2 1 Existing Pipes or Cables Whenever a crossing is made of an existing pipe or cable such pipe or cable shall be securely supported during the progress of the work The minimum spaces required between services are contained in the Utility providers Code of Practice summarised as follows e Electricity is to pass under gas and water at reticulation crossings e The existing cable shall be protected by a split length of heavy duty duct or concrete slabs If 150 mm clearances cannot be maintained then the cable shall be sleeved with a duct The length of duct must be at least of 500 mm on either side of the crossing Cover bedding and backfill
32. ent blockage and flooding of cable pits and basement type substations and switchroom 17 5 Coupling PVC cement shall be used to join ducts to prevent entry of water and foreign matter into the conduit 17 6 Installation of Ducts All ducts shall have a minimum cover of 750mm to the top of the duct and no ducts shall be installed with more than 1100mm cover except railway crossing in Section 8 3 1 Where cables in a trench are all installed in ducts local soil excavated from the trench can be used for bedding and backfill provided it is free of organic matter and rocks of 75mm diameter or larger DM 3399230 word version Page 30 Ducts are to be laid in horizontal formation up to four parallel and thereafter in tier formation Road crossing ducts shall be installed in accordance with Section 8 6 Road and Vehicle Crossing All ducts shall be plugged with suitable end caps Draw wires shall be provided in spare ducts When the ducts are installed prior to the main cable trenching marker tape shall be installed 300mm above the duct and brought out to ground level at each end with a marker peg at one end Marker pegs are not required for greenfield subdivision developments The most economic method shall be used to install conduits across roads Subject to cost boring is preferred for all single or double conduit crossings where conduits of 100mm size or larger are to be installed For locations where more than two ducts a
33. ents to protect these structures if there is a possibility of damage or hazards occurring The ASP shall notify the WP s representative forthwith in all cases of such damage or hazards occurring DM 3399230 word version Page 34 20 Pillars amp Pits 20 1 General Service pillars must be located within the lot boundaries at the corner as shown in Appendix D Pits shall only be used where it is impractical to install a pillar such as on a traffic island or beside a narrow driveway Service pit installation Final Ground Level Pit 1 Locate the service pit in the preferred location taking into account Available space o Trafficable areas o Proximity of other utility pits 2 Determine final ground level 3 Install pit so that top of pit is flush with final ground level 4 Install utility service cable conduit 9 Leave ground open for installation of customer service s and street lighting cable conduits 6 Partly backfill and compact soil around pit 7 Install insulating barrier 8 Fit pit lid and keyhole plug 9 When customer service s and street lighting cable conduits have been installed complete backfilling and soil compaction around pit Where there is a change in level between the service tee and the pillar the cable shall be protected in conduit where it traverses the slope DM 3399230 word version Page 35 Appendix Cable alignment and depth Greenfield Site 3500mm Verge Minimum 1 1m
34. eoo oT Dae e Dee eo 29 16 10 CABLE COVER AND MARKER TAPE Q cccccccccssesseccccccccssssseecccccecssssuceescccessusuaeescessseuuuaeassens 29 16 11 CABEE SEALING pt tee Eo b does a dete 29 16 12 EXPOSED UNDERGROUND 56 400 00 000 000000000 29 17 6 Eu 30 DES APPLICATION eret rere e Pete be Ee eI 30 17 2 BURIED etes 30 17 32 cENCASED DUCTS 30 TEL GSEABING z oct Steel ite dne ak etal Co tad os taal at Rh ale te DE ted le td 30 17 52 EEN 30 17 6 INSTALLATION OF DUCTS 5 N 30 17 7 DPULEING THROUGH DUCTS 31 Armour Pulling sch oen en mee 31 17 72 SStockmg Pullifig reet bete e ote e o 31 17 73 Pullinga iii Eee bade 31 IIA Pulling ni E 31 18 REINSTATEMENT ce ed ceo 32 1821 hd 32 18 2 COM ACTON Rete uate tbe e ee 32 18 35 2 de p eee Tek eo 32 18 4 REM
35. ers shall be installed to indicate the location of all underground power cables The markers shall be located above or adjacent to the buried cable AS 4799 2000 Clause 3 10 2 At points of entering and leaving the property of the PTA Atchanges of direction e At distance between consecutive markers of the lesser of 200m or line of sight e Where specified at the ends of the under track crossing the end of the under track crossing is taken as the point 3m beyond the outer rail or toe of the embankment The markers shall comply with the following requirements AS 4799 2000 Clause 3 10 3 Stand at least 800mm out of the ground to the bottom of the marker plate Be of non combustible material for the marker plates and of at least fire resistant material for the pole e Wording on the markers to be legible permanent and formed in non combustible medium or as otherwise approved by the PTA The descriptive wording and instructions shown on the markers shall face the railway AS 4799 2000 Clause 3 10 4 The wording on the markers shall include the following AS 4799 2000 Clause 3 10 5 e The owner s name e Awarning of the presence of a buried service e The nature of the buried service Contact advice the event of an emergency DM 3399230 word version Page 12 10 1 3 Installation of power cables under tracks and elsewhere on railway property Power cables passing under the tracks shall be
36. es Prior to carrying out above ground work near WP s power line the ASP must lodge Request to Work Near Underground and Overhead Power lines with WP and comply with WP s Applicant Information Pack for Working in the Vicinity of Power lines The request form and the information pack are available from http www westernpower com au safety working near electricity html 6 4 Working in the Vicinity of Traffic When working in road reserves or in the vicinity of traffic traffic management must be carried out to meet the requirements of the Traffic Management for Works on Roads Code of Practice of Main Roads WA DM 3399230 word version Page 7 7 Work Planning 7 1 Responsibilities The ASP shall obtain information from all utilities about the location of existing services within the proposed area of work To obtain the underground equipment details the ASP shall use the Dial Before You Dig Service detailed in Appendix C Overhead service will be identified visually on site The ASP shall also conduct the required tests in accordance with Western Power Network Standard NS 11 2013 Distribution Commissioning Work instruction 7 2 Planning and Risk Assessment Before commencing work an on site team review by all involved parties including the civil contractor etc shall be carried out to address hazard management and work practices and shall include but not limited to e Identify hazards e Assess risks that
37. ic wave wound neutral and an outer HDPE means a wire cable or form of metal designed for carrying electric current means a person who will be WP s site representative and to whom all technical and contractual matters shall be referred means a person or persons involved in work on or adjacent to assets for which this standard can be applied This definition may be equally applied to persons who are or are not considered staff of WP means not connected to any source of electrical supply but not necessarily isolated means directly electrically connected to the general mass of earth so as to ensure and maintain the effective dissipation of electrical energy means connected to a source of electrical supply means a nominal voltage exceeding 1 000V ac or exceeding 1 500V dc Page 3 Insulated Isolated Live Live Work Low voltage Safe Safety Observer Shall Should SPURS Voltage Western Power s Representative HDPE HV LV PTA PAW DM 3399230 word version means separated from adjoining conducting material by conducting substance which provides resistance to the passage of current or to disruptive discharges through or over the surface of the substance at the operating voltage and to mitigate the danger of shock or injurious leakage of current means disconnected from all possible sources of electricity supply which will prevent unintentional energisation of the apparatus
38. if weather conditions will cause soil to be washed or blown away DM 3399230 word version Page 20 14 Directional Drilling 14 1 Drilled Tunnels A maximum of two LV cables of 185mm including streetlight cables can be installed in a common drill tunnel if there will be no tee or service joints along the cables One 35mm HV transformer cable and one LV cable of 185mm or less can be installed in a common drill tunnel if there will be no tee or service joints along the LV cable Multiple high voltage feeder cables 185mm 240mm or 400mm shall not be combined into a single drill tunnel Separate tunnels shall be used between 900mm minimum depth and 1500mm maximum depth Cable spacing shall meet the requirements of Drawing No UDS 6 2 in Appendix 22 of the UDS Manual 14 2 Digging Entry and Exit Pits An appropriate entry and exit pit are required for directional drilling 14 3 Protection of Cables in Special Terrain Where terrain consists of solid rocks or broken rocks or was land fill site cables installed by directional drilling must be protected by suitable poly pipes 14 4 Drilling During construction continuous monitoring and plotting of the pilot drill and back reamer progress shall be recorded to ensure compliance with the required alignment and depth The monitoring may be accomplished either be manual plotting based on the location and depth readings provided by the tracking system or by computer generated tra
39. ing roads shall be installed with a minimum horizontal clearance of 150mm from other services DM 3399230 word version Page 16 11 Cable Tunnels and Support Systems 11 1 General Cables shall be supported on racking with a maximum spacing of 1500mm Horizontal spacing of cables shall be at least 100mm 11 2 Access pits In circumstances where there is a change in route for the cables being installed the design requires the installation of an access pit to be large enough to e Allow two people to work comfortably on the cable e Install rollers e Accommodate for the bending radii of the largest cable available to WP At present this is 400mm Al HV XLPE cable 11 3 Cable Support The solid cleating support system in which the cleating distance is such that the cable is maintained in a straight line with no sagging may be employed Wooden cleats are to be used for paper lead insulated cables When using any of these methods it is necessary to ensure the cable is rigidly held at the cleat position Cleats for long vertical runs must be designed to support the weight of the cable Cleats used on single core cable must be of non magnetic material such as wood or aluminium Single core cables shall never be surrounded with a steel ring as this will cause local heating problems When applying cleats to cables care must be taken to ensure the correct size cleat is used otherwise damage to the cable may result A tight cleat may
40. ltages o transfer potentials o the potential for faults on adjacent cables and joints and o Capacitive voltages b Identification of individual existing cables to be worked on shall be carried out using signal generator methods Using spiking gun methods for HV cables will back the cable identification up WP will carry out Cable identification DM 3399230 word version Page 14 Identify and safeguard against any physical hazards present on the site These include but are not limited to possibility of mechanical damage to existing cables or joints and excavating or installing cable d A worker shall not physically handle a high voltage or low voltage cable whether sheathed or screened if its condition is suspect to be damaged unless the cable is proved to be de energised e Subject to c above the ASP shall not physically handle a high voltage cable while it is live unless authorised by WP s representative f A high voltage cable shall be isolated earthed and proved to be de energised on site prior to commencing work on the cable 0 excavation sites should be examined thoroughly for indications of underground cables and or conduits by careful hand excavation h Cable covers such as cover slabs or marker tapes if present must not be disturbed and if disturbed reinstated to the appropriate position i For equipment with earth grids o particular attention should be paid to areas surroun
41. n fully backfilled to ground level for more than 5 working days or over a weekend or public holiday Note For terminating cables into Switchgear or Live End Seals refer to Work Practice Manual 7 4 DM 3399230 word version Page 29 17 Conduits 17 1 Application Conduits and ducts complying with Australian Standard AS2053 shall be used to protect cables installed in the following situations e Cables installed outside the 0 500mm standard alignment e Cables installed in easement Exist cables of a distribution substation that is set back from road or property boundary e Cables near to retaining walls e Cables crossing roads e Cables crossing water course and drains e Cables crossing high pressure gas pipelines e Cables crossing under railway e Cables within bridge crossings 17 2 Buried direct When buried direct outside the 0 500mm standard alignment is approved by WP ducts are not required The cables must be laid in open trench backfilled with clean sand in accordance with Section 14 9 and protected by cable slabs as shown on drawing No UDS 6 1 in Appendix E 17 3 Encased ducts In some locations PVC ducts may be encased in concrete ducts or concrete Cables shall never be installed in concrete ducts 17 4 Sealing All spare conduits must be sealed against the ingress of water and any foreign material that may hinder in the pulling of future cables Sealing of the conduits must be carried out to prev
42. nformation can be obtained by telephoning 1800 806 246 DM 3399230 word version Page C 2 Appendix D Equipment and Installation Drawings TYPICAL PILLAR EXCLUSION ZONE NTS 500mm OTHER SERVICES 600mm FOR STORMWATER EARTH STAKE LOT BOUNDARY STREET BOUNDARY BOUNDARY PEG TYPICAL CONDUIT UNDER WALL DETAIL NTS 509 OR 700mm WHERE FOOTINGS EXTEND FURTHER INTO THE LOT STREET BOUNDARY RETAINING WALL FINISHED SURFACE GROUND LEVEL V BENDING RADIUS FDR DUCTS MUST BE gt DM 3399230 word version TYPICAL PILLAR EXCLUSION ZONE NTS OTHER SERVICES 600mm FOR STORMWATER EARTH STAKE 500mm ONE PILLAR 4 LOT BOUNDARY FOOTINGS EXTEND 500 OR 700mm WHERE FURTHER INTO THE LOT STREET BOUNDARY BOUNDARY M TYPICAL CONDUIT UNDER WALL DETAIL STREET BOUNDARY RETAINING WALL NI GROUND LEVEL 850mm MIN 2 x 50mm DUCTS NTS 700mm FINISHED SURFACE VISAS BENDING RADIUS FOR DUCTS MUST BE gt 1 Page D 1 Drawing UDS 6 1 Appendix E aq pa oJddp ji 59 40 340N Q3A0NddV IN3ANDITV 440 1 318 2 41 lav 8 30333 J18V 3214835 118 2 0 45
43. nment shall be increased as required so that cables joints will have the necessary depth of cover 16 10 Cable Cover and Marker Tape Cable covers if required and PVC marker tape shall be laid at the required levels as shown in drawing UDS 6 1 in Appendix E The cable covers shall comply with the requirements of clauses 3 11 3 3 of AS NZS 3000 2000 Where more than one cable is installed the PVC maker tape or cable cover must be wide enough to fully cover the cables otherwise additional maker tapes and covers shall be installed 16 11 Cable Sealing On completion of the pull any pulling eyes fitted should be removed and the cable resealed unless terminating that day Cables shall be sealed by grazing the outer HDPE with sand paper cleaning and then capping The sealing and resealing of cables after pulling is required to maintain cable integrity during construction ultimately preventing water ingress 16 12 Exposed Underground Cables The cable must be blinded with cable sand as soon as practical after installation to reduce the chance of damage or theft and then backfilled to full height as soon as practically possible All open cable trenches and joint holes must be inspected daily Cables that are energised or terminated to switchgear irrespective of whether this equipment is live must not e left unattended in excavations without approved barriers and signs be accessible to the public and remain without having bee
44. nt and Conservation DEC DEC land entry permits formerly CALM Protected Wetlands Acid Sulphate Soils Management plan for the works where they exist Waste Management including Controlled Waste Noise Dust Erosion Incident Response This includes informing Western Power and relevant departments when unexpected incident or discovery occurs etc Aboriginal Heritage Sites Investigate and manage Objects of suspected Aboriginal origin Policy and Procedure Native Title The ASP must comply with the requirements of the Utility Providers Code of Practice Section 8 8 and 8 9 and any other relevant legislation DM 3399230 word version Page 11 10 Crossings 10 1 Railway 10 1 1 10 1 2 Installation of Ducts and Cables Where site conditions permit the installation shall be by boring or directional drilling for the portion under the tracks and at least 3m beyond the outer rails or 3m beyond the toe of embankment whichever is the further AS 4799 2000 Clause 3 5 1 In the case of boring the diameter of the bored hole shall not exceed the outside diameter of the pipe conduit by more than 50mm If the diameter of the bored hole exceeds the outside diameter of the pipe conduit by 50mm or the bored hole needs to be abandoned the hole shall be backfilled according to AS 4799 2000 clause 3 9 3 and remedial measures shall be taken to provide support for the railway Installation of Markers Cable mark
45. on time will be minimized with longer cable runs due to less frequent stoppage less drum changes required 15 2 Core Arrangement Each core in a three phase circuit can be place in two different formations trefoil triangular and flat formation The choice between these depends on several parameters including conductor area available space and loss factors d axial distance Figure 1 Illustration of trefoil triangular formation d axial distance DM 3399230 word version Page 23 Figure 2 Illustration of flat formation At this stage for all practical aspects cable shall be installed in the flat formation with the maximum allowable separation of 30mm between cores To ensure losses are evenly distributed across all three 3 phases the cores must be transposed at every cable drum change as show in Figure 3 This transposition also minimises any net induction into other services in the vicinity e g telecom pipeline 2 1 3 2 1 Figure 3 Illustration of a transposed system 15 3 Backfill Requirements When cables are ploughed in the cables must be bedded in clean sand Backfilling shall comply with the published Subdivision Design Guideline Number 4 Bedding Sand and Backfill Around Cables and General Backfill for Cable Trenches materials Selection Guidelines It can be found on the Western Power website at the following address http www westernpower com au mainContent connectionsUpgrades Profe
46. re to be installed together open excavation methods may be used for crossing roads 17 7 Pulling through Ducts 17 7 1 17 7 2 17 7 3 17 7 4 Care shall be taken to avoid damaging the outer sheath of the cable where it enters and leaves the duct Single core bundled XLPE high voltage cables are particularly susceptible due to their uneven shape and thin outer sheath A suitable lubricant should be used to reduce the friction between the cable and the duct A tapered or belled entry shall be used at the entry end of ducts during pulling to prevent damage to cable There are numerous methods by which the cable can be pulled into the final installed position Generally the most economical methods employ power winches If considering only those pulling methods using mechanical winches then there are four distinct methods Armour Pulling This system uses the actual armour wires of the cable as the pulling medium The armour wires left extended past the end of the cable are formed into a pulling eye and the winch rope attached to it This method is not applicable to XLPE cables Stocking Pulling Cable pulling using a cable stocking is probably the most common form of installation for cable up to and including 33kV The cable stocking is slipped on to the end of the cable and the winch rope attached On applying tension the stocking shrinks diametrically until a firm grip is obtained Care must be taken when using this method to ensure
47. red for footpaths by the Local Government Act 1960 18 2 Compaction Spoil or other approved filling shall be carefully placed in the trench Stones rocks and paving material shall be removed The whole of this backfilling shall be carried out so as to avoid future subsidence In all other cases the backfilled material will be compacted to the same density as the surrounding soil 18 3 Levelling The surface shall be left in such a condition as not to constitute a hazard and shall be the same as the original unexcavated land 18 4 Removal and disposal of surplus material The ASP shall be responsible for removal and disposal of all surplus spoil from the Site Any pipe or cable off cuts shall not be buried in the trench All unusable cable lengths and unsuitable material supplied by WP shall be reconciled and returned WP s stores 18 5 Restoration of surface In all areas except greenfield subdivision developments upon completion of any operation affecting pavements or constructed surfaces the ASP shall restore the pavements or constructed surfaces in accordance with the Restoration and Reinstatement Specification for Local Governments in Western Australia Published by the Institute of Public Works Engineering Australia DM 3399230 word version Page 32 Restoration of surface includes restoration of footpath of all type of materials e g bitumen brick paving liquid limestones etc If pavements or any constructed portions
48. s and trench work shall comply with WorkSafe requirements They may include but is not limited to e When a pit is to be left open overnight proper barrier mesh and flashing lights etc as required must be attached to pickets at least 300mm from the edge of the excavation or the pit must be covered e Soil must be piled back from the edge of the pit at least 600mm to conform to WorkSafe regulations e Pits or trenches deeper than 1500mm in normal soil may require a ladder for access and require shoring benching or sloping of the sides of them e Pits or trenches may require shoring if less than 1500mm deep and the soil is unstable e Undermining walls foundations streets or pavements are to be avoided otherwise proper shoring is required e All shoring benching and sloping must be installed to WorkSafe requirements and its Code of Practice Excavation e Barriers shall be erected to prevent vehicles inadvertently falling into the excavation e Collapse or flooding of trenches e Lack of ventilation or suitable lighting Dangerous gases e Confined working space e High temperatures e Traffic hazards DM 3399230 word version Page 6 6 3 Working the Proximity of Overhead Power Lines and Infrastructure When working in proximity to overhead power lines and equipment the requirements of WorkSafe must be complied with A 10m radius exclusion zone shall always be maintained around all transmission towers and pol
49. ssional Devel opers Technical Documentation html All cables shall be firmly and uniformly bedded in sand free from rocks or other hard formation The cable configuration must be surrounded with sand all around thickness of sand as follow Bottom 150mm Two sides 50mm Top 300mm 50mm 50mm Figure 4 Illustration of thickness of sand around cables Flat Formation This is consistent with the Underground Cable Installation UCI and Underground Distribution Schemes UDS manual and practised by other utilities DM 3399230 word version Page 24 15 4 Cable Marking The following guidelines are to be followed with regards to above ground cable markers Table 1 Cable Marking requirements Marker Tape Above Ground Alignment Category Description 300mm Above Cable Markers Cables Required Cable within standard Cable to be installed at 0 500mm alignment a depth of 850mm with orange marker tape YES NO above cable Cable within 2 4 3 0 Cable to be installed at alignment a depth of 850mm with YES NO orange marker tape above cable Cable outside road Cable to be installed at reserve in remote a depth of 1200mm area where there with orange marker YES YES no other services or tape above cables and infrastructure in the above ground cable vicinity markers 15 4 1 Above Ground Cable Markers Permanent above ground cable markers shall be installed along a c
50. there will be gaps between the edge of the alignment and the duct In this case cable protector slabs must be installed p DRAWING No UDS 6 4 Western Power ROAD CROSSING DUCT PLACEMENTS SCALE 1500 UNDERGROUND DISTRIBUTION SCHEME SHEET 1 OF 1 MANUAL CABLE AND DUCT PLACEMENTS ACROSS ROADS 9494 2006 Q DM 3399230 word version Page F 1
51. tion where excavation is proposed the potential impact of the activity a contact person and their address for issuing of the services information and whether or not on site assistance is required What do need to know when dialing 1100 When calling 1100 be ready to provide the operator with Your name and address e name of company if applicable e contact telephone number e facsimile number for return information contact on site site address e commencement date of the proposed work of work being carried out Within two days you will receive plans of relevant underground services If you have not received information from Dial Before You Dig after two working days from the date of your request contact Dial Before You Dig direct on 08 9424 8117 or 08 9424 8118 during office hours 8 00 am 5 00 pm weekdays Note No work is to commence until all relevant information has been received If you have already received information from Dial Before You Dig further data and other information can be obtained by telephoning the contacts listed on the cover sheet provided Be aware that not all underground service owners are members of Dial Before You Dig Refer to relevant road authority Main Roads WA or Local Government DM 3399230 word version Page C 1 Further information For further information on Dial Before You Dig telephone 08 9424 8117 or 08 9424 8118 during office hours Further Telstra i
52. ves the drum This is particularly important on the outer layers where drum batten nails can cause damage If it is necessary to roll the cable drum it should be rolled in the direction indicated by the arrow on the drum The drum should be mounted on jacks cable trailer or cable stands such that the cable is preferably pulled from the top and always in the direction opposite to that indicated by the arrow Lighter cables may be laid by mounting the cable drum on its side on a truck mounted turntable and laying the cable directly into the trench When pulling from large drums i e over 2m in diameter the cable should be supported to prevent stressing the cable from the drum to the trench on a suitable ramp Alternatively cables can be rolled directly into a trench from the drum mounted on an excavator moving along the trench To limit the chance of damage to the cable prior to removing the cable drum battens a check should be done to ensure that the drum spindle is level and permits even rotation of the drum During pulling there is a tendency for cable slack to accumulate on the drum slack shall be avoided and one possible method to achieve this is to limit drum rotation by using plank brake shoes against one or both flanges of the drum If the inner end of the cable on the drum referred to as the Z end protrudes through the side of the drum then it should be watched during pulling to ensure it is not damaged It is advisable to ti
53. ween the gas pipe and the hot work area 10 3 2 Cast Iron and Old Steel Pipes 10 4 The ASP must call the pipeline owner to site prior to hot work being started to ensure there is no gas is in the trench or surrounding area Communications Prior to commencement of work the ASP must contact One Call 1100 to identify the location of communication services and carry out potholing by soft excavation to identify the actual depth and position of the cables The communication s alignment is between 500 1300mm from the verge and 450mm deep Whenever a cable crosses is a communications cable the cable shall be securely supported during the process of the work and the power cable shall go under the communications cable maintaining a 300mm clearance as per Utility Providers Code of Practice The space between the power cable and the communications cables shall be maintained when the trench is backfilled Appendix A provides the diagram for the road reserve allocation for utility providers 10 5 Other Electricity Services Work on or near underground cables shall be in accordance with the procedures approved by WP Work shall not commence unless the cable has been identified or located The following precautions shall be taken before working on or near cables a Identify and safeguard against any electrical hazards that are present on the site These can include but are not limited to o live electrical apparatus o induced vo
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