underground cable installation manual word

8/12/2019 Underground Cable Installation Manual Word

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Underground Cable InstallationManual

Horizon Power 1st

EditionMarch 2013

Prepared by Asset & Works Capabili ty

Operations Division


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Document Title: Underground Cable Installation Manual Issue Date: Mach 2013Document Number: DM #3597930v3 Horizon Power User to check printed document is correct

DOCUMENT CONTROL

Document Owner

(May also be the Process Owner)

Name: Shane Eeles

Position: Asset & Works Capability Manager

Date: March 2013

Approved By *

Name: Shane Eeles

Position: Asset & Works Capability Manager

Date: March 2013

Authorisation **Process Owner is hereby vested

with authority and responsibility tomanage the process end to end.

Name: Ziggy Wilk

Position: General Manager Operations

Date: March 2013

Date Created/Last Updated March 2013

Review Frequency *** Every 3 years

Next Review Date *** March 2016

* Must be the Process Owner and is the person assigned authority and responsibility for managing the whole process, end-to-end, which may extend across more than one division and/or functions, in order to deliver agreed business results.

** This person will have the power to grant the process owner the authori ty and responsi bili ty to manage theprocess from end to end.

*** Frequency period is dependent upon circums tances maximum is 5 years from last iss ue, review, or revisi onwhichever is the latest. If left blank, the default will be 1 year unless otherwise specified.

STAKEHOLDERS

The following positions must be consulted if anupdate or review is required:

NOTIFICATION LIST

The following positions must be notified of anyauthorised change:

Work Delivery Coordinators Regional Managers

Network Asset ManagementCoordinators

Manager Asset & Works

Engineering & Projects


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Document Title: Underground Cable Installation Manual Issue Date: March 2013Document Number: DM #3597930v3 Horizon Power User to check printed document is correct

Important Notice to Users

This Underground Cable Installation manual has been developed for use by Horizon

Power employees and Service Providers engaged to perform construction andmaintenance work on Horizon Powers underground electrical distribution networks.

This manual has been developed to provide guidelines for a minimum acceptablestandard of underground construction that is required by Horizon Power. To this end,this manual provides the framework by which auditing of the underground electricitydistribution network may be undertaken.

It is issued by as a controlled document by Horizon Power to Horizon Power employeesand Service Providers on the condition that it will only be used whilst undertakingUnderground Cable Installation work on Horizon Power underground electricaldistribution networks.

Underground Cable Installation work will only be performed by individuals who areappropriately trained and qualified in accordance with accepted standards withinHorizon Power. This Manual is not intended, and should not in any way be relied upon,as a substitute for such training.

Copyright 2012

Copyright is owned by Horizon Power.

Horizon Power (ACN 57 955 011 697).

All rights reserved. No part of this work may be reproduced or copied in any form or byany means (graphic, electronic, taping or information retrieval system) without thewritten permission of the copyright owner.


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Table of ContentsPage i


Table of Contents

Section Page Number

1 PURPOSE .............................................................................................................1-1

2 APPLICATION ............ ............. ............ ............. ............. ............. ............. .............2-1

3 DEFINITIONS AND REFERENCES .....................................................................3-1

3.1 Definitions .............................. ............................. .............................. ........................... 3-1 3.2 References .................................................................................................................. 3-3

4 GENERAL REQUIREMENTS ...............................................................................4-1

4.1 Training and Authorisation .......................................... ............................ .................... 4-1 4.2 Job Planning and Risk Assessments (Work Planning) ................................................ 4-1 4.3 Personal Protective Equipment (PPE) ........................ .............................. .................. 4-2 4.4 Contractor Responsibilities .......................... ............................... ............................... .. 4-2 4.5 Traffic Management .................................................................................................... 4-2 4.6 Instructions, Procedures and Standards ............................. ............................. ........... 4-3

5 SURVEYING AND AS CONSTRUCTED RECORDS ........................................5-1

5.1 Survey Benchmarks and Datum Points ........................... ............................... ............. 5-1 5.2 As Constructed Records ............................................ ............................... .................. 5-1

6 CROSSINGS .........................................................................................................6-1

6.1 Railway Crossings .......................... .............................. ............................. .................. 6-1 6.1.1 Planning Requirements ........................... ............................. .............................. ......... 6-1 6.1.2 Installation of Cables and Conduits .............................. ............................. .................. 6-1 6.1.3 Installation of Cable Location Markers ................................................ ........................ 6-1 6.1.4 Installation of Power Cables under tracks and elsewhere on railway property ........... 6-2 6.2 Existing Pipes or Cables ............................................................................................. 6-4 6.3 Gas Mains ................................................................................................................... 6-5 6.4 Communications .......................... ............................. .............................. ..................... 6-5 6.5 Existing Underground Electrical Cables ............................ .............................. ............ 6-5 6.6 Road and Vehicle Crossings ............................ ............................. .............................. 6-6 6.7 Horizontal Cable Clearance to other Services at Road Crossings ........................... ... 6-6

7 CABLE TUNNELS AND SUPPORT SYSTEMS ...................................................7-1

7.1 General ............................ .............................. ............................. .............................. ... 7-1 7.2 Access Pits ........................ ............................. ............................ ............................ ..... 7-1 7.3 Cable Support ............................................................................................................. 7-1

8 CABLE ON AND OFF NORMAL ALIGNMENT ................................................8-1

8.1 Standard Cable Alignment ......................................... ............................. .................... 8-1 8.2 Alternative Cable Alignment ............................ .............................. ............................. . 8-1 8.3 Easements .................................................................................................................. 8-1 8.4 Retrospective Undergrounding ........................... ............................. ............................ 8-1


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9 TRENCHING AND EXCAVATION ....................................................................... 9-1

9.1 General .......................................... ............................. .............................. ................... 9-1 9.2 Blasting ............................................ ............................. .............................. ................. 9-1 9.3 Excavated Materials ............................ .............................. ............................. .............. 9-1

10 DIRECTIONAL DRILLING .......................................................................... 10-1 10.1 Installation Principles ................................................................................................. 10-1 10.2 Drilling ........................................................................................................................ 10-1 10.3 Drilling Fluids Management Plan ............................................................................... 10-2

11 PLOUGHING ............................................................................................... 11-1

12 CABLE LAYING .......................................................................................... 12-1

12.1 Drum Mounting and Inspection .............................. ............................. ....................... 12-1 12.1.1 Inspection prior to installation: .................................................................................... 12-1 12.1.2 Preparation for installation ......................................................................................... 12-1 12.2 Protection of Cables during Installation ............................ ............................. ............. 12-2 12.3 Cable Installation methods .......................... .............................. ............................. .... 12-2 12.3.1 Stocking Pulling.......................................................................................................... 12-2 12.3.2 Installation using Pulling Eyes .................................................................................... 12-2 12.3.3 Bond Pulling ............................................................................................................... 12-3 12.3.4 Armour Pulling........................... .............................. .............................. ..................... 12-3 12.3.5 Mechanical Assisted Installation ......................... ............................ ........................... 12-3 12.4 Cable Pulling Tensions .............................................................................................. 12-3 12.5 Pulling Speed ............................................................................................................. 12-4 12.6 Cable Bending Radii .................................................................................................. 12-4 12.7 Maximum Number of Cable Joints .............................. ................................. .............. 12-4 12.8 Installation of Cables on Poles ......................... .............................. ............................ 12-4 12.9 Bedding and Backfill .................................................................................................. 12-4 12.10 Depth of Cover for Cables.......................................................................................... 12-4 12.11 Cable Protection Covers and Marker Tapes ............................. .............................. ... 12-5 12.12 Sealing of Cables ....................................................................................................... 12-5

13 CONDUITS .................................................................................................. 13-1

13.1 Application ......................... .............................. ............................. ............................. 13-1 13.2 Requirements for cables installed outside normal alignments .......................... ......... 13-1 13.3 Encased Conduits ...................................................................................................... 13-1 13.4 Sealing of Conduits .......................... ............................. .............................. ............... 13-1 13.5 Installation requirements for Conduits .............................. ............................. ............. 13-2 13.6 Pulling Cables through Conduits ............................. .............................. ..................... 13-2

14 CABLE JOINTING AND TERMINATIONS ................................................. 14-1

14.1 General ...................................................................................................................... 14-1 14.2 Cable Joint Excavations .............................. ............................. .............................. .... 14-1 14.3 Jointing ....................................................................................................................... 14-2 14.4 Termite Proofing ........................................................................................................ 14-3 14.5 Terminations .............................................................................................................. 14-3 14.6 Working Ends ............................................................................................................. 14-3

15 TESTING AND COMMISSIONING ............................................................. 15-1


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16 REINSTATEMENT ....................................................................................... 16-1

16.1 General ............................ .............................. ............................. .............................. . 16-1 16.2 Compaction ............................................................................................................... 16-1 16.3 Levelling .................................................................................................................... 16-1 16.4 Restoration of Surface ............................. ............................. .............................. ....... 16-1

17 DAMAGE TO PROPERTY ........................................................................... 17-1

17.1 General ............................ .............................. ............................. .............................. . 17-1

18 PILLARS AND PITS .................................................................................... 18-1

18.1 General ............................ .............................. ............................. .............................. . 18-1

APPENDIX A - SERVICE ALIGNMENT, DEPTH AND COLOURS FOR GREENFIELDSITES .............................................................................................................................. 1

APPENDIX B CABLE INSTALLATION DATA .................. ............. ............. ............. ... 3

APPENDIX C - PILLAR LOCATION ............. ............ ............. ............ ............. ............ .... 5

APPENDIX D - TYPICAL CABLE TRENCH ARRANGEMENTS ......... ............. ............. 7

APPENDIX E - CONDUIT INSTALLATION AT ROAD CROSSINGS .......... .............. .. 13

APPENDIX F - DIAL BEFORE YOU DIG SERVICE ............ ............. ............. ............. .. 15


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SECTION 1Page 1- 1


1 PURPOSE

This manual specifies the technical requirements for the safe and efficient installation ofunderground cables on Horizon Powers electrical distribution networks.

This document refers to other Horizon Power documents to provide reference standardsfor underground cable installation work.


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2 APPLICATION

This manual has been developed for use by Horizon Power employees and ServiceProviders engaged in the installation of high and low voltage distribution cables on theHorizon Power electrical networks.

Horizon Power employees and Service Providers shall comply with these requirements,except as otherwise approved.

For subdivisional work managed by a developer where the subdivision does not requireequipment to be installed on public land, some items in this document may not beapplicable as they are specified in the Underground Distribution Scheme (UDS) Manual.

Note: Public land is land that at the time of subdivision is freely available for publicuse, e.g., existing road reserves, Public Access Way (PAW), Public OpenSpace (POS) etc.


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3 DEFINITIONS AND REFERENCES

3.1 Definitions

Accredi tedServiceProvider (ASP)

means a person or an entity who has been accredited throughthe accreditation scheme of Horizon Power to undertake anyconstruction work on Horizon Power underground network.

Approved means having appropriate organisation endorsement in writingfor a specific function.

Authori sedPerson

means a person with technical knowledge or sufficientexperience who has been approved, or delegated authority toact on behalf of Horizon Power to perform the duty concerned.

Cable means a single cable core, or two or more cable cores laid uptogether, either with or without fillings, reinforcements orprotective coverings.

Conductor means a wire or other form of conducting material suitable forcarrying current, but not including wire or other metallic partsdirectly employed in converting electrical energy into anotherform.

ConstructionProject Manager(CPM)

means the officer appointed by Horizon Power as HorizonPowers representative to whom all site contractual andtechnical matters are referred.

Earthed means directly electrically connected to the general mass ofearth so as to ensure and maintain the effective dissipation ofelectrical energy.

Energised means connected to a source of electrical supply.

High voltage means a nominal voltage exceeding 1,000 V ac or exceeding1,500 V dc.

Insulated means separated from adjacent conducting material by a non-conducting substance or airspace permanently providingresistance to the passage of current, or to disruptive dischargesthrough or over the surface of the substance or space, to obviatedanger of shock or injurious leakage of current.

Live means energised or subject to hazardous induced or capacitivevoltages.

Low voltage means nominal voltage exceeding 50 V ac or 120 V dc but notexceeding 1000 V ac or 1500 V dc.


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Safe means not posing an unacceptable risk to life, health orproperty.

Safety Observer means a person competent for the task and specifically

assigned the duty of observing and warning against unsafeapproach to electrical apparatus, or other unsafe conditions.

Shall means a requirement is "mandatory.

Should means a requirement Is "advisory or discretionary.

Voltage means a potential difference between conductors or betweenconductors and earth.

HDPE High Density Polyethylene

HV High Voltage

LV Low Voltage

MRWA Main Roads Western Australia

PTA Public Transport Authority

PAW Public Access Way

POS Public Open Space

UDS Manual Underground Distribution Schemes Manual

WAGR Western Australian Government Railway

WAPC Western Australian Planning Commission

XLPE Cross-linked Polyethylene


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3.2 ReferencesRequirements and Information relating to this Standard may be found within the sourcedocuments detailed below:

Utility Providers Code of Practice, Main Roads WA;

Restoration and Reinstatement Specification for Local Governments in Western Australia published by the Institute of Public Works Engineering Australia (availablefrom Main Roads WAs web site);

Horizon Power Underground Distribution Schemes (UDS) Manual;

Horizon Power Network Standard: Testing & Commissioning TechnicalRequirements;

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;

Occupational Safety and Health Act 1984 and Occupational Safety and HealthRegulations 1996.

WorkSafe Code of Practice: Excavation

Explosives and Dangerous Goods Act 1961 and Explosives and Dangerous Goods(Explosives) Regulations 1963;

AS 1742 Manual of uniform traffic control devices, Australian Standards;

AS/NZS 3000 Australian/New Zealand Wiring Rules; and

AS 4799-2000 Installation of underground utility services and pipelines within railwayboundaries.


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SECTION 4Page 4-1


4 GENERAL REQUIREMENTS

All Horizon Power underground cables shall be a termite protected type. Termiteprotection is critical to achieve 40+ year cable life, as Horizon Power cables are ofteninstalled in termite affected areas

Cables are termite protected using the following means:

a) inclusion of a termicide in the outer sheath (Horizon Power method);b) double brass tapes;c) nylon sheaths

The cable sheath MUST NOT be scratched during installation. Scratch damage to theouter sheath may allow termites mandibles (pincers) to bite into the cable outersheath.

4.1 Training and Authorisation

Underground Cable Installation work shall only be performed by individuals who areappropriately trained, qualified and authorised in accordance with accepted standardswithin Horizon Power.

Service Providers are responsible for ensuring all its employees and Sub-Contractoremployees have been authorised by Horizon Power. They must submit to HorizonPowers site representative confirmation of authorisation for each employee, prior to thecommencement of the works.

Note: This Manual is not intended, and should not in any way be relied upon, as asubstitute for training.

4.2 Job Planning and Risk Assessments (Work Planning)

Prior to the commencement of the work, an on-site job risk assessment must beundertaken by all Horizon Power and Service Provider team members in accordancewith Horizon Powers Job Risk Assessment Process and Field Instruction FI 2.23 Job Hazard & Risk Assessment, to ensure all aspects of our work is carried out in asafe manner.

The on-site job risk assessment shall include but not limited to:

Identify and discuss the job hazards;

Assess the risks that may result because of the hazard;

Agree on the tasks assigned to control or remove the hazards & risks; and

Implement the control measures


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4.3 Personal Protective Equipment (PPE)

Horizon Power and Service Provider employees engaged in the installation of high andlow voltage distribution cables on the Horizon Power electrical networks shall wear thePersonal Protective Equipment (PPE) as required in accordance with Horizon Powers

Minimum Personal Protective Clothing and Footwear Standard and relevant FieldInstructions.

This includes but not limited to:

Long sleeve overalls or long sleeve shirts and trousers with High Visibility propertiesfor day and night AS/NZS 1906.4:1997;

Have properties not inferior to 100% cotton drill;

Minimum material weight of 185gsm;

Safety footwear to comply with AS 2210 and Horizon Power Field Instruction 2.6 -Worksite Clothing/PPE Requirements

Safety glasses must be worn in accordance with Horizon Powers Field Instruction2.5 - Wearing of Eye Protection

Safety Helmets must be worn in accordance with Horizon Powers Field Instruction2.2 - Wearing of Safety Helmets

4.4 Contractor Responsibili ties

The Contractor is to provide competent, qualified and licensed Personnel to undertakeUnderground Cable Installation.

All Contractor Personnel utilised to carry out work activities on or near Horizon Powerselectrical networks must have Horizon Power authorisation prior to the commencementof the Services.

4.5 Traffi c Management

Horizon Power and Service Providers shall ensure that where Services are sitedadjacent to existing roads, adequate precautions are taken at all times to protectpersonnel, associated plant, and the general public.

Horizon Power and Service Providers shall comply with the Main Roads DepartmentTraffic Management for Road Works Code of Practice and Horizon Powers FieldInstruction FI 2.15 - Temporary Safety Barriers and/or Warning Signs (DM# 3136675)

The Local Government Authority shall be notified of any occasion it may be necessaryto obstruct a road or footpath to carry out the Services. The Contractor shall obtain thewritten consent of the Main Roads Department and the relevant local authority beforecreating such obstruction.

All vehicles shall be fitted with suitable warning lights.


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4.6 Instructions, Procedures and Standards

Horizon Power and Service Providers shall comply with Horizon Power instructions,procedures, standards and construction drawings when engaged in the installation ofhigh and low voltage distribution cables on the Horizon Power electrical networks.

This includes but not limited to the following Horizon Power documents:

Selected Horizon Power Field Instructions and Work Procedures

Electrical Safety Standards (ESS)

Fit for Work Policy

Minimum Personal Protective Clothing and Footwear Standard

Job Risk Assessment Procedure

Hazard Incident Reporting Notification and Investigation Procedure

Guidelines For Excavation Work Near Horizon Powers Underground And OverheadElectrical Networks

Project Flow & Quality Assurance Procedure for All Work Types

Underground Distribution Schemes (UDS) Manual.

Underground Cable Installation Manual

Testing & Commissioning Standard

Substation Installation Manual

Distribution Equipment Labelling Standard

Construction Drawings

DFIS/DFMS Reference Guide As Constructed Drawing Requirements

Copies will be provided to Service Providers at pre-star meetings, prior to thecommencement of the works.


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5 SURVEYING AND AS CONSTRUCTED RECORDS

5.1 Survey Benchmarks and Datum Points

There may be official survey benchmarks installed in the project work area. Precautionsshall be taken to avoid disturbing these markers. Should any markers be disturbed, allcosts associated with restoring the benchmarks to their correct position shall be borneby those responsible for such disturbance.

5.2 As Constructed Records

Upon completion of all work, the following As Constructed records shall be provided tothe Horizon Powers Construction Project Manager (CPM):

1. Cable installation record. Where cables are installed using directional drilling, thelength and depth of cables shall be recorded.

2. Electrical test schedules.

3. HV cable joint schedule.

4. Materials & equipment schedule.

The As Constructed records shall meet the requirements of Section 9.2.3.7 of theUnderground Distribution Schemes Manual.

Standard forms for Electrical Test Schedules, HV Cable Joint Schedules and Materials

& Equipment Schedule are available for download from Horizon Powers web site.


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6 CROSSINGS

6.1 Railway Crossings

6.1.1 Planning RequirementsBefore commencing any works associated with railway property, it is essential that allnecessary applications are made and approvals obtained. Details of the applicationsand approval process requirements are contained in the Utility Providers Code ofPractice for Western Australia (Appendix D- Utilities Located in Rail Reserves).

The approval process can take several months, so appropriate planning for the works isrecommended. In most cases, arrangements will be required to use a railway flagmanat the site for the duration of the works.

6.1.2 Install ation of Cables and Condui tsWhere site conditions permit, the installation shall be by boring or directional drilling forthe portion under the tracks and at least 3 m beyond the outer rails or 3 m beyond thetoe of embankment, whichever is the further.

In the case of boring, the diameter of the bored hole shall not exceed the outsidediameter of the pipe/conduit by more than 50 mm. If the diameter of the bored holeexceeds the outside diameter of the pipe/conduit by 50 mm or the bored hole needs tobe abandoned, the hole shall be backfilled and remedial measures shall be taken toprovide support for the railway.

6.1.3 Installation of Cable Location MarkersCable marker details are available in Horizon Powers Distribution Design Catalogue(DDC) Section 7. Cable markers shall be installed to indicate the location of allunderground power cables.

1. The markers shall be located above or adjacent to the buried cable:

a) At points of entering and leaving the Public Transport Authority (PTA)property;

b) At changes of direction;

c) At a distance between consecutive markers of the lesser of 200 m or line ofsight; and

d) Where specified, at the ends of the under track crossing (the end of theunder track crossing is taken as the point 3 m beyond the outer rail or toe ofthe embankment).

2. The wording on the markers shall include the following:

a) The owners name;

b) A warning of the presence of a buried service;

c) The nature of the buried service; and

d) Contact details and advice in the event of an emergency.


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3. The markers shall comply with the following requirements:

a) Stand at least 800 mm out of the ground, to the bottom of the marker plate;

b) Be of non-combustible material for the marker plates and of at least fire-resistant material for the pole; and

c) Wording on the markers shall be legible, permanent, and formed in a non-combustible medium, or as otherwise approved by the PTA.

4. The descriptive wording and instructions shown on the markers shall face therailway.

6.1.4 Installation of Power Cables under tracks and elsewhere on railway property

Power cables passing under the tracks shall be enclosed in an appropriate Category Asystem. The top of the encasing pipe or conduit shall be at a depth of not less than

2000 mm below the top of rail and shall be maintained at this depth for not less3000 mm beyond the outer rails, when measured at right angles to the track, unlessotherwise stated in the approved design.

A Category A system is an underground system where:

a) Cables are enclosed in heavy duty insulating conduit without furthermechanical protection.

b) Cables are enclosed in insulating wiring enclosures encased in concrete.

c) Sheathed cables are enclosed in galvanised steel pipe without furthermechanical protection or

d) Armoured sheathed cables or neutral screened cables are buried direct inthe ground without mechanical protection.


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SECTION 6Page 6-3


Dimension Descrip tion Minimum depth (mm)

X Depth between top of rail andconduit, pipe or cable

1200/1500 (directly buried optic)2000 (power)

Y Depth between top of rail andencasing pipe

1200/2000 (power)

Figure 1 Section of conduit or pipe-carrying cable under tracks

Power cables passing elsewhere on the property of the PTA shall be laid at a depth ofnot less than 1000 mm below ground level, or at the same depth below the level ofdrain inverts they may cross unless, otherwise stated in the approved design.


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Where specified by the PTA, the cables shall also be enclosed in conduits or coveredby protective slabs.

Figure 2 Section of cable within and parallel to railway reserve

6.2 Existing Pipes or Cables

Whenever a crossing is made of an existing pipe or cable, such pipe or cable shall besecurely supported during the progress of the work.

The minimum spaces required between services are contained in the Utility providersCode of Practice, summarised as follows.

1. Electricity is to pass under gas and water at reticulation crossings.


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2. The existing cable shall be protected by a split length of heavy duty conduit orconcrete slabs. If 150 mm clearances cannot be maintained then the cable shallbe sleeved with a conduit. The length of conduit shall be at least of 500 mm oneither side of the crossing.

3. A minimum clearance of 300mm is required between gas and electricity services.If 300mm clearance cannot be achieved, approval of the Gas Service Providershall be obtained.

4. A minimum clearance of 150mm is required between the electricity services andthe sewer and water mains.

5. All reticulation shall be laid within 100 mm of the indicated centre line andsecured against movement with initial backfill.

6.3 Gas MainsWhere work is required close to the gas transmission system such work shall beperformed in accordance with Horizon Powers Field Instruction FI 4.1 Work

Adjacent to Gas Mains.

6.4 Communications

The communications alignment is between 500-1300 mm from the property boundarywithin the verge, and 450 mm deep. Whenever a cable crosses is a communicationscable, the cable shall be securely supported during the process of the work and thepower cable shall go under the communications cable, maintaining a 300 mm clearanceas per Utility Providers Code of Practice.

The space between the power cable and the communications cables shall bemaintained when the trench is backfilled.

Appendix A provides the diagram for the road reserve allocation for utility providers.

6.5 Existing Underground Electrical Cables

Prior to the commencement of excavation work, all efforts must be made to determine ifunderground cables are present in the vicinity of the proposed excavation. Thisincludes but is not limited to using the One Call service.

Work on or near existing underground cables shall be in accordance with HorizonPowers Guidelines for Excavation Work Near Horizon Powers Overhead andUnderground Network and Field Instruction FI 4.5 Working Near UndergroundCables.

If any unrecorded underground cables, conduits or bare earth wires are exposed, workin the vicinity must cease and Horizon Powers CPM must be notified immediately.


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SECTION 6Page 6-6


6.6 Road and Vehicle Crossings

All cables crossing roads and vehicle crossovers shall be installed in conduits. Roadcrossings shall be installed:

a) Perpendicular to the property street boundaries; and

b) between readily recovered target points, e.g., common property boundariesor intersections.

For service cables and streetlight cables, the conduits shall be installed from the edgeof the cable alignment to as close as practical to the termination point (e.g. street lightcolumn, etc).

For cables with a large bending radius, road-crossing conduits shall extend a minimumof 1000 mm beyond the kerb into the verge and as practically close to the termination

point. Cable covers shall be installed over cables in the gaps between the end ofconduits and the edge of cable alignment, to ensure that the cable is protected until itenters the cable alignment.

Note: Full details of the above requirements are shown on Drawing in Appendix F.

Where roads and vehicle crossings are already constructed, thrust boring shall be usedto install the required conduits.

Conduit crossing locations shall be permanently identified on the road kerb-face.Typical identification methods could include a:

a) 75 mm high letter E embedded or cut in,

b) proprietary brass plate/letter E adhered to the face.

Where conduits are installed across roadways where no kerbs currently exist or will notbe installed when the conduits are installed, conduit location as-built drawings shallshow the conduit centreline end-point relative to surveyed property boundaries.

6.7 Horizontal Cable Clearance to other Services at Road Crossings

All cables and conduits crossing roads shall be installed with a minimum horizontalclearance of 150 mm from other services.


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8 CABLE ON AND OFF NORMAL ALIGNMENT

8.1 Standard Cable Alignment

Wherever practicable, cables shall be installed in Horizon Powers standard alignmentof 0 500 mm from the property boundary in accordance with the Utility ProvidersCode of Practice for Western Australia and Drawing in Appendix E;

Other services shall not be installed in the power cable alignment without writtenapproval from Horizon Power.

All front boundary pegs shall be identified prior to the commencement of excavation.

8.2 Alternative Cable Alignment

Cables may be installed in the 2.7m alignment where there are installation andmaintenance issues adjacent to retaining walls and other structures in the standard 0 500 mm alignment. This is provided it is acceptable to the other Utility Service Providersand it does not interfere with street trees.

In special circumstances if the 2.4 m to 3 m alignment is not available, a written requestto the other Utilities will be required to obtain approval to use their alignments.

8.3 Easements

Where HV and LV cables are installed outside the standard alignment or in locationsother than road reserves, including private property, public open space or public accessway, they shall be protected by surveyed and registered easements.

Two types of underground distribution easements exist.

a) development areas controlled by the WAPC process: Easements arearranged under Section 167 of the Planning and Development Act 2005.

b) other developments areas: Easements are arranged under the EnergyOperators (Power) Act 1979.

The appropriate easement shall be selected and documented in the design file for eachparticular location.

Note: For subdivision developments, developers shall comply with the requirementsof the UDS Manual.

8.4 Retrospective Undergrounding

Where the standard cable alignment is not practically available for retrospectiveunderground areas, the cable centre line shall be relocated to a centreline of 2.7 m fromthe property line (ie the standard pole and trees alignment). The correct property lineshall be identified by survey and where there is any doubt as to its correct location, therequired directions shall be obtained from the relevant authority.


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SECTION 8Page 8-2


Where existing overhead electrical apparatus (poles) impedes the installation ofunderground electrical apparatus (cables) in the 2.7 m alignment, approval may berequested to install the cables on the opposite side of the road in the standard cablealignment.

Where the poles and trees alignment is not available, special arrangements will need tobe determined and directed by Horizon Powers Asset & Works group.


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SECTION 9Page 9-1


9 TRENCHING AND EXCAVATION

9.1 General

All excavation work shall be carried out in accordance with the requirements ofWorkSafe WA Code of Practice Excavation, Horizon Powers Field Instructions FI4.4 Excavation Work and FI 4.5 Working On or Near Underground Electrical Networks.

Trenches shall be excavated to a width sufficient for satisfactory and safe workingconditions.

Excavations shall provide the specified minimum cover so as to avoid damage or lossof support to, obstacles such as pipes, drains, cables and other utilities and services;and

The excavated area shall be reinstated in accordance with section 16 of this manual.

Note: The use of a dedicated safety observer will be required when excavating witha machine in the vicinity of live or de-energised underground cables or groundmounted electrical apparatus.

9.2 Blasting

On occasions blasting operations may be undertaken for excavation in rock, limestoneand clay.

Blasting is not permitted within 30 metres of other utilities and where the blasting willaffect their equipment

Handling and use of explosives for blasting operations shall be carried out by, or underthe direct supervision of, a licensed shot-firer.

Adequate warning signs shall be displayed and all precautions against flying materialtaken by the use of pegged or weighted blasting mats or similar aids

Blasting shall be limited in built up areas and shall only take place when all nearbybuilding occupants have been notified in writing and all buildings have been thoroughly

inspected, photographed (where required) and their condition recorded.Note: Service Providers shall pay for any damage or injury caused by blasting.

9.3 Excavated Materials

In built up areas where permitted by the relevant authorities and where practicable,reusable top layers of excavated material such as lawns, pavers, topsoil, etc shall beneatly stacked on one side of the trench and the bottom layer of soil shall be stackedseparately on the opposite side of the trench.

Some Local Government Authorities require all excavated materials, including pavingmaterials to be removed temporarily or permanently from site to enable continued


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pedestrian access without having to walk on the road and reduce the potential forvandalism. Unsuitable soil shall be disposed of and graded backfill brought in.

No excavated material shall be placed, or encroach, on private property without the

written approval of the owner.In built up areas, excavated soil shall be covered with tarpaulins or similar protection ifweather conditions will cause soil to be washed or blown away.


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10 DIRECTIONAL DRILLING

10.1 Installation Principles

Directional drilling is becoming the preferred method of installation for undergroundworks due to improvements in technology and minimum installation disruption.

Conduits and cables shall be installed in accordance with the approved constructiondrawings.

In general, the following principles shall apply:

a) each cable shall be installed in a single way conduit.

b) cable and conduit installations shall be installed between 900 mm minimumdepth and 1500 mm maximum depth unless other requirements of thisdocument (eg rail crossings) or local site conditions apply.

c) cable spacings shall meet the requirements of Drawing No. UDS-6-2 in theUnderground Distribution Scheme (UDS) Manual or as designed foralternative installations.

d) Conduits installed by directional drilling shall not require additional cableprotection covers or cable marker tapes.

A maximum of two LV cables of 185mm, including streetlight cables can beinstalled in a common directional drilling bore if there will be no tee orservice joints along the cables.

One 35mm HV transformer cable and one LV cable of 185mm or less canbe installed in a common directional drilling bore if there will be no tee orservice joints along the LV cable.

Multiple high voltage feeder cables (185mm, 240mm or 400mm) shall notbe combined into a single directional drilling bore.

Separate directional drilling bores shall be used between 900mmminimum depth and 1500mm maximum depth. Cable spacing shall meet the

requirements of Drawing No. UDS-6-2 in Appendix 22 of the UDS Manual10.2 Drilling

During construction, continuous monitoring and plotting of the pilot drill and backreamer progress shall be recorded to ensure compliance with the required alignmentand installation depth. The monitoring may be accomplished either by manual plottingbased on the location and depth readings provided by the tracking system or bycomputer-generated track logs fed by this information. The tracking system shallprovide information on:

a) Clock and pitch.

b) Alignment and Depth.


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c) Position (x-y).

d) Azimuth - is defined as the direction of cable where a walkover is notpossible.

The bore logs shall show a depth and bore position from a known boundary every 3malong the bore line. These records shall be made available to Horizon Powerelectronically as a permanent record.

To prevent collapse of the borehole, drilling mud or similar material rather than justwater shall be used for both drilling and back reaming operations.

Drilling, back-reaming speeds and fluid flow shall be set to ensure spoil is removedwithout putting unacceptable pressure on the surrounding soil (e.g. surface humping).

During conduit and/or cable installation, pull-back tension shall be set so as to not

exceed conduit/cable manufacturers maximum pulling tensions.Note: See Appendix B or Manufacturers recommendations for maximum pulling

tension for various cable types and sizes.

10.3 Drill ing Fluids Management Plan

A drilling fluids management plan shall be completed prior to the commencement ofdirectional drilling work. The plan shall contain the following:

a) Method of slurry containment.

b) Method of recycling drilling fluids and spoil if applicable.c) Method of transporting drilling fluids and spoil off site.

d) Drilling fluid pressures.

e) Measures to contain and clean the affected area for inadvertent return ofdrilling or hydraulic fluids.

f) Measures to adequately clean up of surface seepage of drilling fluids andspoils.


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11 PLOUGHING

Ploughing installation of cables is not a current approved method at this stage.Proposals to use this technology should be discussed with Horizon Power prior tocommitting to the technology.


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SECTION 12Page 12-1


12 CABLE LAYING

12.1 Drum Mounting and Inspection

Prior to installation of cables, the following shall be carried out:

12.1.1 Inspection prior to installation:

Following removal of the drum battens or transport protective covering and prior tocommencing cable installation, check:

a) each drum for transport damage;

b) integrity of manufacturers seals on inner and outer cable ends;

c) condition of armouring, serving and sheath, particularly damage from drumbatten nails;

d) Mechanical damage, corrosion and/or leakage of impregnating oil (whereapplicable).

If the cable is found to be defective, it shall not be installed and arrangements made forit to be returned to the supplier for replacement.

12.1.2 Preparation for installation

Each drum should be mounted on jacks, cable trailer or cable stands sothe cable is preferably pulled from the top and always in the directionopposite to that indicated by the arrow on the drum;

Lighter cables may be laid by mounting the cable drum on its side on atruck-mounted turntable and laying the cable directly into the trench;

Prior to removing the cable drum battens, ensure the drum-spindle is level and that thedrum turns freely;

If it is necessary to roll a drum into position prior to mounting, ensure the drum is rolledin the direction indicated by the arrow on the drum;

Cable drums should be positioned in line with the direction of cable pull;

As an alternate to a fixed mounting for the cable drum, cables may be rolled directly into

a trench from the drum mounted on mobile plant (e.g. excavator) moving along thetrench.

WARNING

Sealed cables m ay contain methane (a flammable gas)The cable manufacturing process produces methane inside thecable.Where a cable has fitted with a heat shrink end cap & pressurerelief valve before the cable is cut , any pressure build up shall bebled by inserting a pin into the valve until no further gas is heard tobe escaping.

Cable end capwith pressurerelief valve


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SECTION 12Page 12-2


12.2 Protection of Cables duri ng Installation

Cable should be fed from the top of the drum to prevent cableslack.

When pulling from large drums, the cable should be supportedbetween the drum and the trench with a suitable ramp orrollers to prevent stressing the cable;

Cables shall be kept clear of abrasive surfaces by suitable means, e.g.rollers, etc to prevent any damage to the cable sheath. The cable shallbe placed in the trench without sustaining abrasion damage and withoutallowing rocks or debris to fall into the trench that could also damage thesheath integrity (allowing termite attack);

Precautions should be taken to prevent the drum from over-rotating and allowing cableslack. A suitable braking mechanism should be installed, either in the form of a drumflange drive or an effective friction brake, eg plank brake shoe. Where brake shoes areutilised, care shall be taken to ensure no damage occurs to the cable Z (inner) endthat protrudes through the drum flange;

On long cable runs or where a cable has significant direction changes (both horizontaland/or vertical), rollers shall be used to ensure minimum pulling or bending of radii aremaintained to ensure a smooth pull and avoid damage to the cable;

Cables which are pulled into position by a winch, shall use suitablecable stockings and swivels to prevent damage; and

When installing cable by directional drilling, it is essential the cable sheath is not

damaged, since damage to the outer jacket may cause sheath faults or compromise theintegrity of the cable termite protection.

12.3 Cable Installation methods

There are numerous methods by which the cable can be pulled into the final installedposition. Generally, the most economical methods employ power winches.

If considering only those pulling methods using mechanical winches, then there are fourdistinct methods:

12.3.1 Stock ing PullingCable pulling using a steel mesh cable stocking is probably the most common form ofinstallation for cables up to and including 33 kV. The cable stocking is slipped on to theend of the cable and the winch rope attached.

Application of pulling tension locks the stocking onto the cable sheath. Care shall betaken to ensure the manufacturers recommended pulling tensions are nor exceeded ascable damage will result.

12.3.2 Installation using Pulling EyesThe 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 befixed directly to cable conductors for pulling the cable.


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12.3.3 Bond PullingWhen likely pulling tensions may exceed the tension limit of the cable, straight end pullsmay have to be replaced by bond pulls. In this method, the cable is lashed to the pullingrope at close intervals (eg every half metre for a distance of 20 metres or more) todistribute the strain of the pulling.

Mechanical padding is required to protect the cable sheath from damage at the lashingpoints.

12.3.4 Armour PullingThis system uses the armour wires of a 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 ropeattached to it.

Caution: This method shall not be used for XLPE cables.

12.3.5 Mechanical Ass isted Install ationFor long or difficult cable installation or large cable sizes, mechanicalassistance can be used to insist installation. Typical methods include:

a) One or more cable caterpillars installed mid or multi-pointalong the cable route to provide intermediate cable thrust;

b) Power assisted driven cable drums.

12.4 Cable Pulling Tensions

Cable pulling tensions shall not exceed the manufacturers recommendations.

The maximum recommended pulling tensions when using stocking grips to install un-armoured XLPE cables are shown in Appendix B .

The trench or conduit line should be set out so that any necessary deviations from astraight line occur over the largest possible radius. When pulling cable into conduitsincorporating bends or pulling rope rollers, lower maximum pulling tensions may benecessary to avoid the wire pulling rope cutting into the side of the conduit.

Any winch used to pull cables shall have either a facility to automatically limit the pullingtension applied to a cable (a tension fuse) or a continuous reading dynamometerincorporated in the pulling arrangement to enable the actual pulling tension to bemonitored.

In special circumstances, cable pulling pits may be required at significant changes incable route direction. Required pits shall be indicated on the design drawing.

On long or complicated cable installations, intermediate cable feeder equipment (orcaterpillars) may be required to limit pulling tensions.


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P r o p e r t y

B o u n d a r y P r o p

e r t y

B o u n d a r y P r o p

e r t y

B o u n d a r y

12.5 Pull ing Speed

To avoid damage due to overruns, the cable should be pulled just fast enough to keepthe drum rotating smoothly.

Higher speeds are possible when pulling small cables into straight trenches or conduitswith good conditions at the feeding and pulling ends;

Drums with long lengths of cable should not be rotated rapidly as overrun can causecable damage if pulling is slowed or stopped suddenly.

12.6 Cable Bending Radii

The permissible bending radii of all cables are given in Appendix B . No twists, knots orkinks are permitted.

Where a 3x1 core HV cable is to be laid to transformers or switchgear, the three twistedcores can be separated at termination location (e.g. Triplex style) into three individualcores to reduce the minimum bending radius required.

12.7 Maximum Number of Cable Join ts

Underground cable joints between terminal points shall be kept to a minimum. Forinformation on the maximum numbers of through joints that may be installed in anysection of cable, refer to the Underground Distribution Scheme (UDS) Manual,Section 9.2.8.7.

12.8 Installation of Cables on Poles

Where cables are installed onto termination poles, the cable shall beinstalled as directly as possible from the cable trench to the pole. Nospare loop of cable is required to be installed at the base of the pole,as it is better to joint in a new section of cable if a termination failureoccurs. The section of cable off the standard alignment shall beprotected by cable slabs and marker tape.

12.9 Bedding and Backfi ll

To protect the cable sheath, all cables shall be firmly and uniformly bedded on sandfree from rocks or other hard formation. The cable shall be surrounded with a thicknessof sand prior to backfilling, bottom by 150 mm and two sides by 100 mm, top by300 mm as shown in drawing in Appendix D . The upper 300 mm of the backfill to finalground level shall also meet the local government authoritys requirements.

12.10 Depth of Cover for Cables

The depth of cover over cables shall not be less than 850 mm. The depth of cover shallbe increased as required to ensure that cable joints will have the required depth ofcover.


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12.11 Cable Protection Covers and Marker Tapes

The cable covers shall comply with the requirements of clauses 3.11.3.3 of AS/NZS3000:2000 and if required, cable covers and PVC marker tape shall be laid at the

required levels, as shown in drawing UDS-6-1 in Appendix E.Where more than one cable is installed, the PVC maker tape or cable cover must bewide enough to fully cover the cables, otherwise additional maker tapes and coversshall be installed.

Additional cable protection shall:

1. be placed maximum 75 mm above the wiring system

2. be not less than 150 mm wide

3. overlap the wiring system by at least 40 mm on each side

4. consist of one or a combination of the following:

a) precast concrete slabs with a minimum thickness of 40 mm and aclassification of not less than grade 20 degrees in accordance with AS 3600

b) a continuous concrete pour having a thickness of not less than 75 mm

c) fibrous cement slabs having a thickness of not less than 12 mm

d) bricks (slabs) manufactured specifically for the protection of electric cables

e) polymeric cable cover strip (complying with AS 4702)f) other materials that offer the same degree of protection as the materials in

items (a) to (e) above.

Note: Conduits installed by directional drilling shall not require cable protectioncovers and marker tapes.

12.12 Sealing of Cables

To ensure water cannot penetrate into the cable conductors or insulation, ends ofcables shall be kept sealed. On completion of the cable pulling, any damaged or non-

waterproof pulling eyes or sealing end caps should be removed and the cable resealed,unless it is to be terminated immediately.

Where cables have been cut following installation, both the installed and drum endsshall be sealed immediately, except where the cable is to be jointed immediately.


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SECTION 13Page 13-1


13 CONDUITS

13.1 Application

Conduits complying with Australian Standard AS 2053 shall be used to protect cableswhere they are installed in the following situations:

a) in easements;

b) exit cables from a distribution substation that is set back from road orproperty boundary;

c) near retaining walls where there is a danger of cable installation damage dueto foundation subsidence;

d) crossing roads;

e) crossing water courses and drains;f) crossing high pressure gas pipelines;

g) crossing under railway lines or restricted access areas such as airports; and

h) within bridge crossings.

13.2 Requir ements for cables inst alled outs ide normal alignments

Where cables are installed outside the 0-500 mm standard alignment or the 2400 3000 mm alignment as approved by Horizon Power for street installation, conduits areNOT required. The cables shall be direct buried, laid in accordance with Section 14.9and protected with cable slabs as shown in Drawing in Appendix E .

13.3 Encased Conduit s

In some locations PVC conduits may be encased in concrete pipes, steel pipes orconcrete encased steel pipes. Unless approved by Horizon Power, cables shall not beinstalled directly in concrete conduits due to potential damage to sheaths duringinstallation.

13.4 Sealing of Conduit s

All conduits, including spare conduits, shall be effectively sealed at the ends and atcouplings;

Sealing of conduits is required to prevent the ingress of water and any foreign materialthat may cause blockage or flooding of cable pits, basement-type substations andswitch rooms;

Wherever possible, suitable conduit plugs or covers should be used for sealing ofconduits in lieu of taping or other makeshift arrangements.

Conduit joints and couplings shall be installed and sealed in accordance with the

manufacturers instructions.


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SECTION 13Page 13-2


13.5 Installation requirements for Conduit s

Where conduits are installed in excavations, they shall be installed:

a) with a minimum cover of 850 mm to the top of the conduit;b) not more than 1100 mm cover as approved by Horizon Power;

c) where all cables in the trench are all installed in conduits, excavated soil maybe used for bedding and backfill, provided it is free of organic matter androcks of 50 mm diameter or larger;

d) normally in flat, horizontal formation for up to four cables, thereafter in tierformation;

e) for road crossings, in accordance with Section 6.6 Road and VehicleCrossings;

f) sealed with suitable end caps;g) with approved draw wires provided in every conduit;

h) when installed prior to the main cable trenching, installed with marker tape300 mm above the conduit. The marker tape shall be brought out to groundlevel at each end, with the conduit end position also being marked with apeg; and

The most economical method shall be used to install conduits across roads. Subject tocost, boring is preferred for single or double conduit crossings, where conduits of100 mm size or larger are required.

For locations where more than two conduits are to be installed together, openexcavation methods may be used for crossing roads.

13.6 Pulling Cables through Conduit s

Care shall be taken to avoid damaging the outer sheath of the cable where it enters andleaves the duct. Single core bundled XLPE high voltage cables are particularlysusceptible due to their uneven shape and thin outer sheath.

To prevent future cable failure a suitable lubricant should be used to reduce the frictionbetween the cable and the duct.

A tapered or belled entry shall be used at the entry end of ducts during pulling toprevent damage to cable.


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SECTION 14Page 14-1


14 CABLE JOINTING AND TERMINATIONS

14.1 General

Underground cable jointing is based on the following Principles of Good CableJointing:

1. Safety shall never be compromised;

2. Jointing pits should be large enough to allow jointers to work freely;

3. Before joining any cable it must be positively identified by approved testingmethods and marked at both ends of the cable;

4. Water barrier within the cables to checked prior to joining the cables:

5. The correct kit for joint and cable size shall be selected;

6. Manufacturers jointing instructions shall be followed unless practicalities suggesta variation. Where fixture torque are recommended, apply those with torquewrench;

7. Accurate measuring, cutting, stripping and torque settings and workmanship shallbe in accordance with the manufacturers instructions;

8. Ground covers shall be used to keep tools & equipment and jointing componentsclean throughout the job . (Ensure joints dont get contaminated with surrounding

soil, sand, or moisture);9. Ensuring enough spare cable so that the cable stripping distances are suitable for

lay of cable (after cable is manipulated to correct position) to complete the joint(s)in accordance with the manufacturers requirements;

10. All cable ends are to be sealed after cutting. Where they are not sealed they are tobe considered suspicious and checked for water ingress prior to use.

11. Housekeeping keep the work environment clean by placing used packaging inbox as work progresses.

14.2 Cable Join t Excavations

There is no standard size for a jointing pit, however joint sizes vary and therefore thesize of the pit in which to carry out the jointing will vary.

To facilitate the joining of Cables and to reduce the impacts on the health and safety ofthe employee/contractor completing the joints, as a minimum, a pit in the trench shouldbe excavated to the following dimensions:

a) 2 meters wide;

b) 2 meters in either direction (4 meters long) of the joint; and

c) at the same depth as the trench.


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Depending upon the depth of the trench / lay of cable; an additional step should be toexcavate in the pit to either side of the cable joint to allow for ease of access andfacilitate the joiner working on the joint. Fig 1 illustrates the concept.

Figure 3 Cable joint pit dimensions

The sides of the pits should be covered with tarpaulins or similar to prevent soil frombeing dislodged while working in the pit.

14.3 Jointing

Before joining any cable it must be positively identified by approved testing methodsand marked at both ends of the cable.

Water barrier within the cables must be checked prior to joining the cables to ensure nomoisture has penetrated into the cable. (Moisture barrier turns green when water ispresent) If moisture is detected, the cable must be strip the cable back to the pointwhere no moisture is present.

All jointing equipment shall be installed in accordance with the manufacturersinstructions supplied with the equipment kit to which they relate.

The use by date of the jointing equipment shall be checked prior to use. Where theused by date has expired, the jointing equipment shall be removed from service and

returned to the depots store for disposal.

Ensure no conductive material is left on the XLPE cable. If necessary remove anyremaining semi-con material with abrasive paper (sandpaper) then clean with a solventwipe.

Note: Never use a knife to cut the semi-con. This can create a void and could resultin the delaminating of the XLPE screen below the ring cut. When stripping thesemi-con screen and you score the XLPE insulation, sandpaper the damagedarea to smooth out the void/irregularities


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The installer identification tags are required on all joints. They shall be marked andfitted adjacent to the joint or termination equipment as per drawing R39 in theReference section of the Distribution Construction Standards Manual.

All 11KV rated cable requiring transition joints shall use FJ0310 and FJ0405 jointassemblies. All 22KV rated cables requiring transition joints shall use FJ0403 jointassembly.

Shear bolts ends shall be filed back to prevent the sharp edges creating a stress pointwithin the cable joint.

14.4 Termite Proofing

Termite proofing shall be installed over all XLPE to XLPE HV straight joints.

The preferred method of termite proofing shall be of the stocking type, which is fittedover the cable prior to joining. Where the stocking type is not available, termite sheetingmay be used in conjunction with heat shrink outer seal of the entire termite protectionarea. Full heat shrink sleeve as provided in kit or zip shrink if jointing area is restricted

On completion of the joint, the termite stocking can be moved over the joint with aminimum cable overlap of 200mm. The ends of the termite stocking shall be sealed withbrass roll springs as provided within termite protection kit TPKIT 80920 .

Where termite sheeting is used, it shall be wrapped around the cable twice and have aminimum cable overlap of 200mm. The ends of the termite sheeting shall be sealedwith brass roll springs as provided within termite protection kit TPKIT 80920. Thesemay be sourced individually from the supplier.

The remaining overlap of termite sheeting over the joint body should be secured evenlyin intervals every 150mm to 200mm with the use of 5mm stainless steel cable ties

14.5 Terminations

All Low Voltage terminations shall be completed in accordance with Part 5 - LowVoltage Underground of the Distribution Construction Standards Manual.

Where no termination drawing exists, all equipment shall be installed in accordancewith the manufacturers instructions supplied with the equipment kit to which they relate.

14.6 Working Ends

If a cable for a future scheme/connection is laid from a universal pillar, kiosk or a lowvoltage frame unit in an existing scheme, then the remote end of this cable must not beleft on a cable drum.

The cable must be made off, insulated to approved methods and placed in a mini pillarwith its top painted white.

In areas where it is not possible to install a pillar, then the remote end of this cable mustbe made off in a joint/shell located in Horizon Powers cable alignment. When this


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method is utilised, the location of the joint/shell (e.g. distance from closest propertyboundary) must be recorded accurately in GIS.


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15 TESTING AND COMMISSIONING

Testing and commissioning shall only be carried out by qualified and Horizon Powerauthorised personnel and in accordance with Horizon Powers Network Testing &Commissioning Standards. (DM# 3127547) and the VLF Testing of HV Cables manual(DM# 3651308)

The Tester-in-Charge shall be responsible for carrying out tests in accordance withthese standards and recording all test results and additional comments where relevant.


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16 REINSTATEMENT

16.1 General

The excavated or disturbed land shall be restored to its original condition. Backfillingand reinstatement of road verges and vehicle crossings as necessary shall becompleted 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 whentrench backfilling has been finished.

All materials, stakes, plant and equipment used during installation shall be removed andall work sites left in a safe condition.

All material off cuts, waste materials and general rubbish shall be removed from siteand disposed of in accordance with the Local Government Authoritys requirements.

The initial backfill over the bedded cables shall be carried out in accordance withSection 12.9 Bedding and Backfill of this manual.

Trenches shall be backfilled, reinstated and compacted to their original level and/or inaccordance with the requirements for footpaths by the Local Government Authority.

16.2 Compaction

Spoil or other approved filling shall be carefully placed in layers into the trench. Stones,rocks and paving material shall be removed from site and not used as backfill.

All backfilling shall be compacted to a minimum 90% of the density as the surroundingsoil in accordance with Horizon Powers Work Procedure WP21 Soil CompactionTesting Requirements (DM# 3561676), to prevent future subsidence.

All results shall be compiled on the Compaction Test Certificate DM# 3483983

16.3 Levelling

Backfilled excavations shall be levelled so as not to constitute a hazard and shall be tothe same as the original unexcavated land.

16.4 Restoration of Surface

On completion of any operations affecting pavements or constructed surfaces, exceptGreenfield subdivision the pavements or constructed surfaces shall be restored inaccordance with the Restoration and Reinstatement Specification for LocalGovernments in Australia Published by the Institute of Public Works Engineering

Australia, which is available at Traffic/Road-works/Working on main roads from MainRoads WAs web site or through the Institute of Public Works Engineering Australia(WA Division) on the IPWEA website.


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Restoration of surface includes restoration of all type of footpath materials, e.g.bitumen, brick paving, liquid limestone, etc.

Where cement footpath slabs have been removed to allow cable trench excavation,

they shall be replaced and reinstated in accordance with the Local Government Authoritys requirements unless otherwise directed by the Horizon Power.


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17 DAMAGE TO PROPERTY

17.1 General

In all areas where cable installation work has been carried out, except as approved byHorizon Power, property or services damaged shall be repaired or replaced as soon aspossible after making safe.

Fences around areas holding livestock shall be secured at all times and if damagedduring construction shall be repaired or made safe immediately to prevent the stockfrom straying.

Damage to reticulation systems and underground services that are disturbed ordamaged shall be restored to working order.

Trees planted in the road verge shall be protected as far as possible. Tree limbsinterfering with the construction shall be removed appropriately by pruning and sealingand the trees left in a reasonable condition.

Inspection shall be done of any structures located along the cable trench route prior tothe commencement of works and arrangements shall be made to protect thesestructures if there is a possibility of damage or hazards occurring.

Horizon Powers CPM shall be notified in all cases of such damage or hazardsoccurring.


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SECTION 18Page 18-1


18 PILLARS AND PITS

18.1 General

Where approved by Horizon Power, service pillars shall be located within the lotboundaries at the corner, adjacent to common boundaries where possible, as shown onDrawing in Appendix D .

Pits shall only be used where it is impractical to install a pillar, such as on a traffic islandor beside a narrow driveway where there is a high probability of impact damage.

Where there is a change in level between the service tee and the pillar, the cable shallbe protected in conduit where it traverses the slope.

Figure 4 - Service pit installation


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APPENDIX A - Service Alignment, Depth And Colours For Greenfield SitesPage 2


Standard Service and Pipe Colours :

Utility Service and Pipe ColoursGas Yellow pipe or Yellow Striped pipe

Electrical Orange pipe or Orange Striped black pipe or Orangeelectrical tape for directly buried black sheathed cable

MRWAa) Traffic Signalsb) Roadside Lightingc) ITS

a) Orange pipeb) Orange pipec) Orange pipe (power) and White pipe (communications)

Telecommunications White pipe or black pipe with White Stripe

Water Blue pipe or Blue Striped pipe

Sewerage Cream pipe or Grey pipe or Cream/Grey Striped pipe

Third Pipe /EffluentReuse

Purple pipe

Note : Colours of pipe relate only to PVC and polyethylene pipe and other materials could be used,particularly in older established areas unless otherwise stated. Some services can be burieddirectly in the ground and not in conduits .

WARNING In existing areas, pipes and condui ts of other Utilit ies may notconform to these standards


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A

Document Title: Underground Cable Installation Manual Document Number: DM #3597930v3 Horizon Power User t

APPENDIX B C ABLE INSTALLATION D ATA

Typical cable reference data, including data relating to cable installation, is shown below.

Note: The ASP shall ob tain and verify t he cable installation data from t he manufacturer for t he particular cable to be ins

Type ofCable

Volts(kV)

No ofCores

CableSize

(mm 2 )

Condr Material

DrumLength

(m)

NominalCablecoreDia

(mm)

NominalOverallCable

Dia(mm)

Maximum Pulling Tension (kN)

1 x Sheathstocking

over all cores

3 x Sheathstockings

one on eachcore

(per core)

Condg

(per

Transformercable

33 3x1cTriplex

50 Al 250 34.4 80 (3c) 7.5 7.5 2.5

HV FeederCable

33 3x1cTriplex

95 Al 250 37.9 94 (3c) 9.8 13.5 4.7

HV FeederCable

33 3x1cTriplex

185 Al 250 42.8 97 (3c) 11.1 15.3 9.2

HV FeederCable

33 3x1 630 Cu 500 30.9 65.4(1c) 7.95

HV FeederCable

33 3x1 1000 Al 500 39.7 72.2(1c) 8.86

Transformercable

12.7/22 3x1cTriplex

35 Al 250 27 69 (3c) 5.2 5.2 1.75

HV Feedercable

underground cable installation manual word

Documents