Network Standard - Ausgrid€¦ · OPGW design information and other telecommunication systems...

NW000-S0090 UNCONTROLLED IF PRINTED of 45

Network Standard

NETWORK

Document No Amendment No Approved By Approval Date Review Date

:::::

NW000-S0090 0 Head of AEP & S 24/06/2015 31/03/2019

(Review Date Changed - 06.02.2019)

NW000-S0090 NS135 SPECIFICATION FOR THE CONSTRUCTION OF OVERHEAD SUB-TRANSMISSION LINES

NS135 Specification for the Construction of Overhead Sub-transmission Lines Amendment No 0


ISSUE

For issue to all Ausgrid and Accredited Service Providers’ staff involved with the design, construction and maintenance (including vegetation management) of Ausgrid’s sub-transmission mains and is for reference by field, technical and engineering staff.

Ausgrid maintains a copy of this and other Network Standards together with updates and amendments on www.ausgrid.com.au.

Where this standard is issued as a controlled document replacing an earlier edition, remove and destroy the superseded document.

DISCLAIMER

As Ausgrid’s standards are subject to ongoing review, the information contained in this document may be amended by Ausgrid at any time. It is possible that conflict may exist between standard documents. In this event, the most recent standard shall prevail.

This document has been developed using information available from field and other sources and is suitable for most situations encountered in Ausgrid. Particular conditions, projects or localities may require special or different practices. It is the responsibility of the local manager, supervisor, assured quality contractor and the individuals involved to make sure that a safe system of work is employed and that statutory requirements are met.

Ausgrid disclaims any and all liability to any person or persons for any procedure, process or any other thing done or not done, as a result of this Standard.

All design work, and the associated supply of materials and equipment, must be undertaken in accordance with and consideration of relevant legislative and regulatory requirements, latest revision of Ausgrid’s Network Standards and specifications and Australian Standards. Designs submitted shall be declared as fit for purpose. Where the designer wishes to include a variation to a network standard or an alternative material or equipment to that currently approved the designer must obtain authorisation from the Network Standard owner before incorporating a variation to a Network Standard in a design.

External designers including those authorised as Accredited Service Providers will seek approval through the approved process as outlined in NS181 Approval of Materials and Equipment and Network Standard Variations. Seeking approval will ensure Network Standards are appropriately updated and that a consistent interpretation of the legislative framework is employed.

Notes: 1. Compliance with this Network Standard does not automatically satisfy the requirements of a Designer Safety Report. The designer must comply with the provisions of the Workplace Health and Safety Regulation 2011 (NSW - Part 6.2 Duties of designer of structure and person who commissions construction work) which requires the designer to provide a written safety report to the person who commissioned the design. This report must be provided to Ausgrid in all instances, including where the design was commissioned by or on behalf of a person who proposes to connect premises to Ausgrid’s network, and will form part of the Designer Safety Report which must also be presented to Ausgrid. Further information is provided in Network Standard (NS) 212 Integrated Support Requirements for Ausgrid Network Assets.

2. Where the procedural requirements of this document conflict with contestable project procedures, the contestable project procedures shall take precedent for the whole project or part thereof which is classified as contestable. Any external contact with Ausgrid for contestable works projects is to be made via the Ausgrid officer responsible for facilitating the contestable project. The Contestable Ausgrid officer will liaise with Ausgrid internal departments and specialists as necessary to fulfil the requirements of this standard. All other technical aspects of this document which are not procedural in nature shall apply to contestable works projects.

INTERPRETATION

In the event that any user of this Standard considers that any of its provisions is uncertain, ambiguous or otherwise in need of interpretation, the user should request Ausgrid to clarify the provision. Ausgrid’s interpretation shall then apply as though it was included in the Standard, and is final and binding. No correspondence will be entered into with any person disputing the meaning of the provision published in the Standard or the accuracy of Ausgrid’s interpretation.

KEYPOINTS

This standard has a summary of content labelled “KEYPOINTS FOR THIS STANDARD”. The inclusion or omission of items in this summary does not signify any specific importance or criticality to the items described. It is meant to simply provide the reader with a quick assessment of some of the major issues addressed by the standard. To fully appreciate the content and the requirements of the standard it must be read in its entirety.

AMENDMENTS TO THIS STANDARD

Where there are changes to this standard from the previously approved version, any previous shading is removed and the newly affected paragraphs are shaded with a grey background. Where the document changes exceed 25% of the document content, any grey background in the document is to be removed and the following words should be shown below the title block on the right hand side of the page in bold and italic, for example, Supersedes – document details (for example, “Supersedes Document Type (Category) Document No. Amendment No.”).

KEY POINTS OF THIS STANDARD


Design Materials and Application Construction and Commissioning

Scope and Risks Addressed

Tools and Forms Annexure C – Conductor Tensing Report Annexure D – Pole Top Constr. Drawings

Tools and Forms Annexure E – Sample Compliance Checklist

This standard provides requirements for the design and installation of overhead sub-transmission lines. The scope and controls for risks addressed include:

applies to changes to existing and establishment of new overhead sub-transmission lines

a Design Brief/ Design Information Package defining the scope of a project and any project specific requirements will be provided (refer Section 9)

the Design Brief may contain additional requirements or situations not covered in this standard

where works in a design plan are not covered by a Network Standard the client shall consult with Ausgrid’s representative and comply with the requirements specified by the representative

the responsibilities of the client are presented in Section 7 and include reference to obtaining development consents

and approvals environmental impact assessments

(where required) making arrangements with

Accredited Designer’s and Accredited Service Providers

all work on or near Ausgrid’s network must comply with Ausgrid Electrical Safety Rules

Where to for more information? Section 1, 2, 7, 12

The major design requirements include:

Ausgrid will supply a Design brief a line survey will be carried out prior to any

design work as detailed in Section 10 requirements for easements and rights of

way are itemised in Section 11 special requirements may apply within zone

and transmission substations Design basic requirements include

considerations for: public safety use of aerial markers crossing navigable waters pole positioning clearances from ground, structures

and vegetation conductor tensions use of bundled conductors structure types use of stay poles and ground anchors under-built and multiple circuit lines installation of pole substations and

UGOH connections on Transmission poles

Insulation co-ordination and earthing voltage support, line losses and line

regulation pole foundations

The materials and line equipment must be new unless written approval obtained from Ausgrid. Requirements relating the equipment include:

purchasing material direct from Ausgrid approval to use of materials not

supplied by Ausgrid overhead conductor sizes listed in Cl.

15.5 overhead earth wires and optical fibre

installations buried earth electrodes requirements for earth fault study on

132kV lines and where specified OPGW design information and other

telecommunication systems Poles types, inspection requirements,

pole steps and painting of poles Line insulators Line switches Surge Diverters And disposal of recovered materials

Resultant design to be submitted to Ausgrid with at least the information provided in Section 16

The following Construction and Commissioning requirements are included:

a Construction Environmental Management Plan is required for construction activities

all work will be undertaken in accordance with Ausgrid Electrical Safety Rules, Be Safe Program and WorkCover Guidelines and all relevant Acts, Regulations and Codes

comply with NS156 Working Near or Around Underground Cables

requirements for the following construction activities pole erection conductor stringing handling of polymeric insulators

Commissioning test requirements Final project documentation Quality, design and asset

documentation

Tools and Forms Annexure - A Pole Check Sheet

Annexure B – Line Schedule Formats

Where to for more information? Section 7 - 11





Network Standard NS135

Specification for the Construction of Overhead Sub-transmission Lines

Contents

1.0 PURPOSE ............................................................................................................................................. 7

2.0 SCOPE .................................................................................................................................................. 7

3.0 REFERENCES ...................................................................................................................................... 7 3.1 General ...................................................................................................................................... 7 3.2 Ausgrid documents .................................................................................................................... 7 3.3 Other standards and documents ................................................................................................ 8 3.4 Acts and regulations................................................................................................................... 9

4.0 DEFINITIONS ...................................................................................................................................... 10

5.0 ASBESTOS .......................................................................................................................................... 11

6.0 INTRODUCTION ................................................................................................................................. 12

7.0 RESPONSIBILITIES ............................................................................................................................ 12

8.0 ENVIRONMENTAL PROCEDURES ................................................................................................... 12

9.0 DESIGN BRIEF .................................................................................................................................... 13

10.0 SURVEY .............................................................................................................................................. 14

11.0 EASEMENTS ....................................................................................................................................... 15

12.0 INSTALLATION OF MAINS WITHIN ZONE AND TRANSMISSION SUBSTATIONS ........................ 16

13.0 DESIGN BASICS ................................................................................................................................. 16 13.1 Public safety ............................................................................................................................. 16

13.1.1 Aerial markers ......................................................................................................... 16 13.1.2 Crossings of navigable waterways ......................................................................... 16

13.2 Pole positioning ........................................................................................................................ 17 13.3 Clearances ............................................................................................................................... 17 13.4 Conductor tensions .................................................................................................................. 18 13.5 Bundled conductors ................................................................................................................. 18 13.6 Structure Types ........................................................................................................................ 18 13.7 Stays ........................................................................................................................................ 19 13.8 Underbuilt/multiple circuits ....................................................................................................... 19

13.8.1 Installation of Pole Substations on Transmission Poles ......................................... 20 13.8.2 Installation of 11kV or LV UGOHs on transmission poles ...................................... 20

13.9 Insulation co-ordination ............................................................................................................ 20 13.10 Earthing .................................................................................................................................... 20

13.10.1 General ................................................................................................................... 20 13.10.2 Positioning of kiosks close to 132kV OH lines ....................................................... 20

13.11 Electrical protection .................................................................................................................. 21 13.12 Voltage support, line losses and line regulation ...................................................................... 21 13.13 Design parameters ................................................................................................................... 21 13.14 Foundation design .................................................................................................................... 21



13.15 Additional design information ................................................................................................... 21

14.0 ELECTRICAL SAFETY PROCEDURES ............................................................................................. 22

15.0 MATERIALS, LINE EQUIPMENT AND APPLICATION TO DESIGN ................................................. 22 15.1 General .................................................................................................................................... 22 15.2 Conductors ............................................................................................................................... 22 15.3 Overhead earth wires and telecommunications cables ........................................................... 22

15.3.1 General ................................................................................................................... 22 15.3.2 Optical pilot ground wire (OPGW) .......................................................................... 22 15.3.3 Overhead earthwires (OHEW) ................................................................................ 23 15.3.4 Buried earth electrodes .......................................................................................... 23 15.3.5 Earth fault study ...................................................................................................... 24 15.3.6 OPGW data ............................................................................................................ 24

15.4 Above ground and underground telecommunications system ................................................. 25 15.5 Poles ........................................................................................................................................ 25

15.5.1 Pole types ............................................................................................................... 25 15.5.2 Inspection of timber poles prior to delivery ............................................................. 26 15.5.3 Inspection of concrete poles prior to delivery ......................................................... 26 15.5.4 Pole steps ............................................................................................................... 26 15.5.5 Painting of poles ..................................................................................................... 26

15.6 Line insulators .......................................................................................................................... 26 15.7 Line switches ............................................................................................................................ 26 15.8 Surge diverters ......................................................................................................................... 26 15.9 Disposal of recovered materials ............................................................................................... 26 15.10 Issue of materials from Ausgrid ............................................................................................... 26 15.11 Materials not obtained from Ausgrid ........................................................................................ 27

16.0 DESIGN DOCUMENTATION .............................................................................................................. 27

17.0 CONSTRUCTION ................................................................................................................................ 28 17.1 General .................................................................................................................................... 28 17.2 Access roads ............................................................................................................................ 28 17.3 Admittance to Ausgrid’s premises ............................................................................................ 28 17.4 Work near underground cables ................................................................................................ 28 17.5 Management of work................................................................................................................ 28 17.6 Traffic plans .............................................................................................................................. 28 17.7 Pole erection ............................................................................................................................ 28 17.8 Conductor stringing .................................................................................................................. 29

17.8.1 Use of hurdles ......................................................................................................... 29 17.9 Handling of polymeric insulators .............................................................................................. 29

18.0 COMMISSIONING TESTS .................................................................................................................. 30

19.0 FINAL PROJECT DOCUMENTATION ................................................................................................ 31

20.0 QUALITY .............................................................................................................................................. 31 20.1 Design ...................................................................................................................................... 31 20.2 Construction ............................................................................................................................. 31 20.3 Warranty ................................................................................................................................... 31

21.0 RECORDKEEPING ............................................................................................................................. 32

22.0 AUTHORITIES AND RESPONSIBILITIES .......................................................................................... 32

23.0 DOCUMENT CONTROL...................................................................................................................... 32

ANNEXURE A – POLE CHECK SHEET ......................................................................................................... 33



ANNEXURE B – LINE SCHEDULE FORMATS .............................................................................................. 34

ANNEXURE C – CONDUCTOR TENSIONING REPORT .............................................................................. 36

ANNEXURE D – POLE TOP CONSTRUCTION DRAWINGS ........................................................................ 38

ANNEXURE E – SAMPLE COMPLIANCE CHECKLIST ................................................................................ 43



1.0 PURPOSE

NS135 specifies the requirements for the construction of overhead sub-transmission lines for use on the Ausgrid network.

2.0 SCOPE

Changes to Ausgrid’s existing overhead sub-transmission lines and establishment of new overhead sub-transmission lines, for which Ausgrid is to accept responsibility shall be designed and constructed in accordance with this Network Standard and any standards referred to in this Standard.

Ausgrid shall determine the need for such changes or new lines - and whether the work is contestable, and shall prepare a Design Brief (see Note) document defining the scope of the project and detailing specific information relevant to the project.

Note: In the case of contestable work, the Design Brief is the ‘Design Information’, as described in the relevant Ausgrid Offer and/or Contract for the works.

3.0 REFERENCES

3.1 General All work covered in this document shall conform to all relevant Legislation, Standards, Codes of Practice and Network Standards. Current Network Standards are available on Ausgrid’s Internet site at www.ausgrid.com.au.

3.2 Ausgrid documents All Ausgrid drawings referenced in this Network Standard and/or issued with the Design Brief

and detailed design

Be Safe Procedure Pro-10: Managing WHS Risk

Be Safe Hazard Guideline HG-01: Asbestos

Be Safe Hazard Guideline HG-04: Electrical Safety

Be Safe Hazard Guideline HG-17: Working at Heights

Bush Fire Risk Management Plan

Company Form (Governance) - Network Document Endorsement and Approval

Company Procedure (Governance) - Network Document Endorsement and Approval

Company Procedure (Network) - Production / Review of Network Standards

Customer Installation Safety Plan

Electrical Safety Rules

Electricity Network Safety Management System Manual

NEGOH14 Guide to the Assessment of Waterway Crossing Risks

NSA1343 Supplement to NS181 - Approval of Materials and Equipment and Network Standard Variations: List of Approved Materials and Equipment

NSA1494 Polymeric Insulator Handling Guide

NS100 Field Recording of Network Assets

NS104 Specification for Electrical Network Project Design Plans

NS116 Design Standards for Distribution Equipment Earthing

NS125 Specification for Low Voltage Overhead Conductors

NS126 Construction of High Voltage Overhead Mains

NS128 Specification for Pole Installation and Removal

NS143 Easements, Leases and Rights of Way



NS156 Working Near or Around Underground Cables

NS165 Safety Requirements for Non-Electrical Work in and around Live Substations

NS167 Positioning of Poles and Lighting Columns

NS174 Environmental Procedures

NS174A EIA Worksheet

NS174B EIA Guideline Supplementary Notes

NS174C Environmental Handbook for Construction & Maintenance Work

NS181 Approval of Materials and Equipment and Network Standard Variations

NS203 Telecommunications Network: Master Policy Document

NS212 Integrated Support Requirements for Ausgrid Network Assets

NS220 Overhead Design Manual

NS261 Requirement for Design Compliance Framework for Network Standards

Public Electrical Safety Awareness Plan

Public Lighting Management Plan

Tree Safety Management Plan

3.3 Other standards and documents AS 1100 Technical Drawing Series

AS 2067 Substations and High Voltage Installations Exceeding 1kV A.C.

AS 2344 Limits of electromagnetic interference from overhead a.c. power lines and high voltage equipment installations in the frequency range 0.15 MHz to 1000 MHz.

AS 3007 Electrical equipment in mines and quarries - Surface installations and associated processing plant. (Where applicable for Ausgrid sub-transmission on joint pole lines with mine circuits.)

AS 3891 Air navigation - Cables and their supporting structures - Marking and safety requirements – Permanent marking of overhead cables and their supporting structures for other than planned low-level flying

AS/NZS 4676 Structural design requirements for utility services poles

AS 6947 Crossing of Waterways by Electricity Infrastructure

AS/NZS 7000 Overhead Line Design – Detailed Procedures (previously ENA C(b)1 Guidelines for Design and Maintenance of Overhead Distribution and Transmission Lines)

CIGRE TB184 Composite Insulator Handling Guide

Code of Practice for Electricity Transmission and Distribution Asset Management (Asset Code)

Crossing of NSW Navigable Waters: Electricity Industry Code

ENA Doc 001-2008 National Electricity Network Safety Code

ENA Doc 025-2010 EG-0 Power System Earthing Guide Part 1: Management Principles

ENA EG1-2006 Substation Earthing Guide

Energised Line Working with Polymer Insulators for Voltages 60kV and Above – IEEE ESMOL Subcommittee 15.07 paper (2006)

HB 87 Joint use poles: The placement on poles of power lines and paired cable telecommunications lines

HB 88 Unbalanced high voltage power lines: Code of practice for the mitigation of noise induced into paired cable telecommunications lines from unbalanced high voltage power lines

HB 101 Coordination of power and telecommunications - Low Frequency Induction (LFI): Code of practice for the mitigation of hazardous voltages induced into telecommunications lines



HB 102 Co-ordination of power and telecommunications - Low Frequency Induction (LFI): application guide to the LFI code

HB 103 Co-ordination of power and telecommunications - crossing code: the arrangement of overhead power and telecommunications lines, pole stay wires and suspension wires

HB 331 Handbook – Overhead Line Design

IEEE 987:2001 Guide for Application of Composite Insulators

K-Line Insulators Handling Guide

‘Scheme for the Accreditation of Service Providers to Undertake Contestable Works' published by the former Electricity Association of New South Wales in accordance with the Electricity Supply (General) Regulation 2001 and administered by the NSW Office of Fair Trading.

3.4 Acts and regulations Electricity Supply (General) Regulation 2014 (NSW)

Electricity Supply (Safety and Network Management) Regulation 2014

Environmental and Planning Assessment Act 1979

State Environmental Planning Policy (SEPP) Infrastructure 2007

The Roads Act 1993, as amended

Work Health and Safety Act 2011 and Regulation 2011



4.0 DEFINITIONS

Accredited Service Provider (ASP)

An individual or entity accredited by the NSW Department of Planning and Environment, Energy, Water and Portfolio Strategy Division, in accordance with the Electricity Supply (Safety and Network Management) Regulation 2014 (NSW).

Accredited Designer

A person accredited as a Level 3 ASP (ASP/3) to design the Works, in accordance with the 'Scheme for the Accreditation of Service Providers to Undertake Contestable Works' published by the former Electricity Association of New South Wales in accordance with the Electricity Supply (General) Regulation 2001 and administered by the NSW Office of Fair Trading.

Note: Ausgrid is an ASP/3; refer to the Office of Fair Trading website for the contact details of all ASP/3s www.fairtrading.nsw.gov.au

ADSS All Dielectric Self Supporting

Business Management System (BMS)

An Ausgrid internal integrated policy and procedure framework that contains the approved version of documents.

Client An individual or entity who is the proponent of a project; a client could be a developer, or customer, or Ausgrid.

In this document:

For Contestable Works, any reference to the Client includes Accredited Designer(s) and Accredited Service Provider(s) working under agreements/contractual arrangements for the Client. For contestable works, the client is not Ausgrid

For projects which are not Contestable Works, Ausgrid is the Client.

Contestable Works

Those works for which the Customer is required to meet the cost and for which the Customer may choose the ASP under section 31 of the Electricity Supply Act (NSW) 1995. This also includes contestable asset relocation works.

Customer A customer is an individual or an entity that is an end-user of electricity.

Document control

Ausgrid employees who work with printed copies of document must check the BMS regularly to monitor version control. Documents are considered “UNCONTROLLED IF PRINTED”, as indicated in the footer.

Design Brief A document issued by Ausgrid that defines the scope of the project and details specific relevant information. In the case of contestable work, the Design Brief is the ‘Design Information’, as defined by IPART.

EMP Environmental Management Plan

EPR Earth potential rise

IPD Instruction for Overhead Development

Lot Boundary The dividing boundary line between adjoining lots.

Network Standard

A document, including Network Planning Standards, that describes the Company's minimum requirements for planning, design, construction, maintenance, technical specification, environmental, property and metering activities on the distribution and transmission network. These documents are stored in the Network Category of the BMS repository.

OH Overhead



OHEW Overhead earthwires

OPGW Optical pilot ground wire

Overhead Sub-transmission Line

An overhead line which is designed for use at 33,000, 66,000 or 132,000 Volts. This may include lines defined as Transmission lines by the Australian Energy Regulator.

Review date The review date displayed in the header of the document is the future date for review of a document. The default period is three years from the date of approval however a review may be mandated at any time where a need is identified. Potential needs for a review include changes in legislation, organisational changes, restructures, occurrence of an incident or changes in technology or work practice and/or identification of efficiency improvements.

Street Alignment The boundary line between the dedicated roadway and the adjoining subdivision lots.

5.0 ASBESTOS

All materials and equipment used for construction of Ausgrid’s assets are to be free from Asbestos and or Asbestos related products. Suppliers are expected to comply with the Work Health Safety Act 2011 (NSW) together with the Work Health Safety Regulation 2011 (NSW) and confirm in writing that all products supplied to Ausgrid contain no Asbestos related materials.

If any asbestos is encountered during construction or maintenance activities then safe work method statements and appropriate practices must be implemented. Materials containing asbestos must be handled by a licensed contractor. This material should be disposed of offsite to an appropriately licensed landfill.

All work must be in accordance with Ausgrid’s Be Safe Hazard Guideline 01: Asbestos.



6.0 INTRODUCTION

This Network Standard provides information on Ausgrid’s requirements for the installation of overhead sub-transmission lines. Work under this Standard is to be carried out subject to and in accordance with the additional requirements of any plans, drawings and documents which may be provided as part of the Design Brief or Design Information Package as appropriate.

Where works called for in a plan are not covered in current Network Standards, the Client shall consult with Ausgrid’s representative and shall comply with the method of construction and any other requirements specified by the representative.

The requirements of other relevant Network Standards must also be complied with. Other Network Standards relevant to this work include the references in Section 3.

7.0 RESPONSIBILITIES

The Client is responsible for the supply of materials and construction of the overhead sub-transmission line as detailed in this Network Standard.

The Client must comply with relevant requirements specified in NS104 Specification for Network Project Design Plans, Section on Consultation, Negotiation and Consent, and must comply with any special requirements of other authorities.

The Client is responsible for obtaining any local council development consent and approval that may be required for building works. The Client will be required to provide evidence to Ausgrid that local council approval has been obtained or is not required.

State Environmental Planning Policy (SEPP) Infrastructure 2007 allows construction works for the purpose of an electricity transmission or distribution network to be carried out by or on behalf of an electricity supply authority or public authority without consent on any land. Ausgrid would be the proponent and the consent authority for those works.

Depending on the type and scale of the works proposed, either an Environmental Impact Assessment under Part 5 of the Environmental and Planning Assessment Act 1979 would be carried out, or alternatively, if only minor works (such as routine maintenance or exempt development with only a minor impact upon the environment), no formal assessment is required. Refer to NS174 Environmental Procedures for further information.

Refer also to Section 8 of this Network Standard for responsibilities for environmental impact assessments.

In addition, for Contestable Works, the Client must comply with the requirements of the relevant Ausgrid Offer and/or Contract for the works, and must enter into agreements/contractual arrangements with an Accredited Designer and an Accredited Service Provider (ASP) for establishing the line.

8.0 ENVIRONMENTAL PROCEDURES

The construction of all overhead sub-transmission mains shall be carried out in accordance with the requirements of NS174, Environmental Procedures and the associated EIA Guidelines, EIA Worksheet and the Environmental Handbook for Construction & Maintenance as appropriate.



9.0 DESIGN BRIEF

A Design Brief will be prepared by Ausgrid for each new section of sub-transmission line construction. For Ausgrid initiated projects, the Design Brief will form part of the Instruction for Project Development (IPD). It may include the following information:

project scope and description

proposed route or end points

required completion date, if applicable to satisfy system loading requirements

operating voltage

line capacity (or in some cases, conductor size and material type for phase conductors)

the maximum design operating temperature of the conductors

the maximum design temperature under wind loading conditions

the minimum design operating temperature of the conductors

permissible pole material, (e.g. concrete, wood, steel)

permissible construction type, (e.g. H-pole, standoff insulators, etc)

allowance for additional circuits, if applicable

conductor size and material type for overhead earthwire, where required

whether the overhead earth wire is not required for the full length of line

whether an OPGW (optical pilot ground wire) is required

required earthing of structures including maximum pole earth resistance and allowable earthing construction (for contestable projects the Client is generally responsible for the earthing study)

protection requirements, where relevant to the scope of works

list of reference drawings or reference materials not specified in this standard

any project specific design or construction constraints

who shall be responsible for obtaining all necessary licences or consents (for contestable projects generally the Client)

who shall be responsible for negotiating any easements and rights-of-way, and who shall negotiate access to work sites and onto private property, where relevant (for contestable projects generally the Client)

the extent to which the Client shall manage the environmental assessment process and requirements for any additional environmental safety and risk management plans

any special conditions or arrangements already made for easements, right(s)-of-way and access to private land

any special conditions or arrangements already made with the local council or roads authority for lines on public roads

any special conditions or arrangements already made with the Mine Subsidence Board for lines within mine subsidence areas.



10.0 SURVEY

A line survey shall be carried out prior to any design work commencing. The survey must be conducted by a registered surveyor or other suitably qualified person with experience in power line surveying.

Prior to finalisation of the survey, a search shall be conducted for all services along the proposed route which are in the vicinity of proposed pole locations. Route plans need to be submitted to all utility companies and where appropriate, public and private companies requesting service and underground infrastructure locations. If the proposed sub-transmission pole locations are too close to other services or structures to allow for safe excavation, or too close, where relevant, for earth potential rise, then the design shall be amended.

The survey should record the position of the following items. This list is not intended to be exhaustive and the survey must cover all items essential to the proper design and construction of the line.

A centre line ground profile of the proposed route of the line.

The position and height of all existing overhead poles and conductors from which safety clearances must be maintained.

The position and height of all structures or ground contours which may come within safety clearances of the new lines when allowing for conductor sag and blow out.

The position and height of all significant trees which have needed to be accommodated in the line design because of environmental issues.

Locations and descriptions of all major below ground installations including other utility mains and services, pits, stormwater drains, etc. which are in the vicinity of proposed pole locations.

Property boundaries for properties traversed by, or in close proximity to the site of the proposed route.

For over-crossing and undercrossing design, maximum and minimum sag is to be obtained from the other line owner. Where this is not available, or where it is necessary to check for changed field conditions; the ambient temperature and approximate wind speed, time and date of survey of existing lines shall be recorded to allow loading to be determined and appropriate sag increases extrapolated. The feeder numbers and relevant structure/pole numbers defining the span should also be recorded.

Where there is any uncertainty about the locations of property boundaries, road alignments or kerb positions, their locations shall be pegged by the surveyor. The construction plan must indicate the location of the pole positions relative to property boundaries etc. as indicated above.

Refer to Clause 13.2 Pole Positioning, and Clause 17.7 Pole Erection, regarding the positioning, survey and pegging of pole positions before pole erection.

Refer also to Section 19 Final Project Documentation for information on ‘as-built’ drawings and other documentation required on completion of the project.



11.0 EASEMENTS

Where possible, line routes shall follow existing roads, and be contained within the road reservation. Pole positioning shall be in accordance with NS167 Positioning of Poles and Lighting Columns and NS128 Specification for Pole Installation and Removal. Refer also to Clause 13.2 Pole Positioning.

Where considerable savings or other advantages may be obtained by traversing private property or other land not dedicated as public road, or where required to prevent encroachments close to Ausgrid's lines, then an easement shall be obtained. The easement shall be negotiated and acquired in accordance with the requirements of NS143 Easements, Leases and Rights of Way using Ausgrid’s standard terms and conditions. Easement widths shall normally be as specified in NS143, or in any supporting documentation prepared justifying the need for departure from these standards. All easements must comply with Ausgrid’s standard Deeds of Agreement for Easements.

Where, because of the route selected, the cable easement is not appropriate for vehicle access for maintenance or repairs, a Right of Way should be established at the same time, to ensure ongoing access for Ausgrid staff and contractors. Refer to NS143 for details of establishing a suitable Right of Way. Also refer to the section on Access Roads.

Where the route traverses Rail property other than rail corridors, an easement is required to cover the crossing; see NS143 Easements, Leases and Rights of Way for details of requirements. Where the route traverses a rail corridor, approval for the crossing must be obtained from the appropriate Rail authority – either RailCorp or Australian Rail Track Corporation (ARTC). The Client is responsible for obtaining approval for the design of the crossing from the appropriate Rail authority in accordance with the requirements of the relevant Master Access Deed (MAD). Construction of Ausgrid network assets on rail corridor can normally only be undertaken by Ausgrid or Ausgrid contractors due to requirements of the Rail authorities. The procedures are detailed in Ausgrid internal documentation such as draft NEGEP02. Where a line design undertaken by an ASP involves a rail crossing, the matter should be referred to Ausgrid for advice. The Client is advised that work on Rail property may have to be carried out in conjunction with scheduled rail line outages. This may involve extensive lead times, typically up to 12 months, or more.

All proposed rail crossings should allow for all line supports to be located OFF rail property wherever possible.

Poles should be located in the road either side of a rail crossing, provided the Rail authority's technical requirements on maximum span lengths and angle of crossing permit this.

Any ducts required for the job should be run the full width of the rail corridor, finishing just outside the Rail property boundary. The cable installation across the railway tracks shall be made by trenchless methods in accordance with the requirements of the Rail Authority concerned. Note that this does not necessarily require a bore across the entire width of rail land, only that the ductline protecting any cables should continue the entire width of the crossing, so that the need to enter rail land for subsequent works is minimised.

Where new works on existing crossings permit, advantage should be taken of the opportunity to relocate existing poles off of the Rail authority’s property where this is appropriate. Any such projects should be referred to Ausgrid Project Development & Approvals Section Branch for a decision on what work should be included in these cases.



12.0 INSTALLATION OF MAINS WITHIN ZONE AND TRANSMISSION SUBSTATIONS

Since activities within substation yards are strictly controlled and only undertaken by authorised personnel in accordance with defined procedures (e.g. NS165 Safety Requirements for Non-Electrical Work in and around Live Substations), for OH mains installed within the boundaries of Ausgrid’s Zone or Transmission substations, some of the requirements of this Network Standard may be relaxed provided a risk assessment is carried out which confirms that this can be done without compromising safety and/or reliability. Also refer to AS2067 - Substations and High Voltage Installations Exceeding 1 kV A.C regarding minimum clearances and approach distances.

For example; depending on the situation, the minimum ground clearance of mains within a substation yard may be reduced provided, the requirements of AS 2067 are met.

13.0 DESIGN BASICS

13.1 Public safety Public safety is a major concern in the design and construction of overhead lines. Care shall be taken in the design to ensure that step and touch potential rises around structures do not exceed values specified in AS/NZS 7000 and HB 331 and that the design also complies with AS/NZS 7000 and HB 331 in all other respects.

Where construction is in the vicinity of a major substation, installations should also comply with the ENA EG-0 Power System Earthing Guide Part 1: Management Principles and ENA EG1 Substation Earthing Guide.

Accredited Designers shall ensure that the construction work can be performed in accordance with Ausgrid's network management planning documents.

13.1.1 Aerial markers Where overhead lines encroach into space that can be considered to be the legitimate domain of aircraft, or where aircraft are known to operate in the vicinity of overhead lines, the overhead lines should be marked to indicate their position and/or direction. Such marking should be in accordance with Australian Standard Series AS 3891. In addition to locations nominated in AS 3891, the Designer shall also consider the appropriateness of aerial markers in the following locations:

areas likely to be used by aircraft involved in fire fighting, where the presence of smoke is likely to reduce visibility of lines – for example where aircraft would be flying low over waterways collecting water

where it is intended that aerial line inspection or patrolling will be used as a normal maintenance practice, new lines will be marked in accordance with AS3891.2.

Note: Installation of markers to assist in low level flying for agricultural or similar purposes shall only be undertaken at the request and cost of the person requesting them.

13.1.2 Crossings of navigable waterways Where a section of line crosses a navigable waterway it must be designed and managed in accordance with the Crossing of NSW Navigable Waters: Electricity Industry Code.

The assessment of waterway crossing risks as required by the Code shall be undertaken in accordance with NEG OH14 Guide to the Assessment of Waterway Crossing Risks.

Also refer to NS220 section on Navigable Waterway Crossings.



13.2 Pole positioning Pole positioning shall be in accordance with NS167 Positioning of Poles and Lighting Columns and NS128 Specification for Pole Installation and Removal, subject to adjustment to accommodate underground services and obstructions.

Pole positioning shall also take into consideration any requirements for separation of poles from other installations such as swimming pools, metallic fences, telecommunications installations and pipelines.

Plans need to be submitted to all service utilities, and where appropriate public and private companies, requesting service and underground infrastructure locations, before pole positions are selected.

Refer to Section 11 Easements, for special requirements in crossing rail property.

Refer also to Clause 17.7 Pole Erection.

13.3 Clearances Clearances from ground, structures and vegetation shall be in accordance with NS220 Section 10 Clearances.

Note: Whilst clearances specified in NS220 are based on AS/NZS 7000 the ground clearance values specified in NS220 Section 10 are more stringent.

When calculating maximum sags for new conductors, allowances shall be made for conductor creep and for minor errors in construction. This additional creep allowance does not have to be applied to existing conductors which are being diverted or reconstructed.

Unless otherwise indicated in the Design Brief, the minimum operating temperature shall be taken as 5°C. The maximum operating temperature shall be 100°C for all conductors, except ACSR conductors erected on steel tower lines, where 120°C may be used. For inter-circuit clearances, the upper circuit shall be assumed to be at maximum operating temperature while the lower circuit is at minimum operating temperature. When this requirement imposes the need for increased pole heights or reduced span lengths, then the design shall be discussed with Ausgrid’s representative. Ausgrid’s representative may under some conditions permit the design to be based on the assumption that the lower circuit will be operating at 15°C. The need for pole changes would then be reviewed. Unless otherwise indicated in the Design Brief, for blow-out calculations, the conductor is assumed to be at 50°C and under wind loads specified in AS/NZS 7000. Also refer to HB331.

Where other circuits cross over or under Ausgrid’s lines, clearances between circuits shall be maintained as per the documents nominated above. The requirements of the owner of the other line shall also be complied with. Where necessary, approval for line crossings shall be obtained from the line owner by the client after clearances have been calculated. Locations where approval cannot be obtained shall be referred to Ausgrid as early in the process as possible to permit time to negotiate changes or select an alternative route. Where clearances to ground and an overcrossing are difficult to achieve, options such as placing the overhead earthwire underground for that span shall be considered and submitted to Ausgrid for approval.

Where lines are constructed along roads, in close proximity to the property boundary:

the conductors must not cross the property boundary under wind blow-out unless an easement is obtained.

local council conditions for building set-back shall be checked to ensure that safety clearances under wind blow-out conditions will be maintained from any possible building works that may be permitted on the private property fronting the road. Easements must be obtained where the set-backs are inadequate.



13.4 Conductor tensions For lines constructed along streets in urban areas, span lengths are typically restricted to less than 100 metres, by blow-out and other considerations. In these cases, high tensions provide no additional benefit such as reduced pole heights or numbers. To minimise the need for pole replacement where existing lines are being up-rated for lines in Sydney suburbs, the design tensions for pole lines shall normally be in accordance with the Table below for the conductors indicated. In other cases, tensions shall be restricted to approximately 10 per cent of Minimum Breaking Load (MBL).

Table 1 - Design Tensions for Existing Pole Lines - Sydney Area

Conductor Design Tension

61/3.25 AAC (Uranus) 8% of MBL

19/3.25 AAC (Neptune) 14% of MBL

19/4.75 AAC (Taurus) 10% of MBL

19/2.00 Copper (see Note) 15% of MBL

Note: 19/2.14 Cu should be used where minor sections of existing 19/2.00 Cu are relocated/replaced.

For lines in non-urban areas, tensions shall not exceed those permitted in AS/NZS 7000, less 2.5 per cent. For example, where a tension of 25 per cent is permitted, lines shall be designed to be erected at not more than 22.5 per cent. Appropriate vibration dampers shall be installed as recommended in AS/NZS 7000 for the conductor tension. Also refer to HB 331.

13.5 Bundled conductors New line designs will generally employ single conductor per phase designs. However, for work on reconstructing existing bundled conductor lines, or where ratings require use of bundled conductor construction, horizontal bundles shall be employed, For spans up to approximately 120 metres, spacers shall be installed asymmetrically along each span, for example:

for spans up to 60 metres, at 40% of the length of the span. for spans between 60 and 120 metres, one at 25%, and one at 55% of span length.

For spans longer than 120 metres, spacers shall be placed in accordance with the manufacturers recommendations, considering conductor size, tension and wind conditions.

13.6 Structure Types Structures shall be selected, as appropriate for the particular situation, from those shown in the Ausgrid drawings referred to in Annexure D. Constructions for any under-built circuits shall be in accordance with the relevant Network Standards (e.g. NS125 or NS126). Any variations from these structures must be nominated and approved separately in writing in accordance with the requirements of NS181 Approval of Materials and Equipment and Network Standard Variations before being used in designs.

Where rigid supports such as concrete or steel poles are to be used, the design shall nominate the means of conductor breakage containment, e.g. load relief devices, shear pin insulators, etc.

To maximise phase-to-phase separations, delta constructions are preferred for all intermediate structures e.g. for 33kV mains; Constructions 4-5, 4-6, or 4-7 where there is no overhead earthwire, or Constructions 4-8E, 4-35 where overhead earthwire is used. The use of flat pin construction (e.g. for 33kV; Construction 4-1) is to be minimised and only used where there is no reasonable alternative e.g. when under-building the circuit or for under-crossing structures.

Where flat constructions are used (i.e. Construction 4-1), the centre phase should be alternated from one side of the pole to the other on each successive pole. Where it is not practicable to



alternate the side of the pole on which the centre phase is located, the sag/tension/span length must be adjusted appropriately to maintain the specified k factor as discussed in Clause 13.13.

13.7 Stays Stays shall generally be in accordance with the requirements of AS/NZS 7000 and as indicated in NS220 Section 7 Stays. In particular, stay insulators shall be installed where the stay wire passes through or near other circuits, or where other attachments are located on the stay pole, as shown on drawing 61501 Overhead Construction – Stays, Stay Poles, Anchorages, Footings, and Termination Arrangements.

In the case of ground anchors with no nearby power circuits, or where no attachments are likely to be made to the stay pole, the stay wire may be earthed instead. Earthed stay wires are also required where stay tensions exceed that normally handled by stay insulators.

Stay poles will normally be used to maintain ground/vehicle clearances in urban areas and other locations where pedestrian traffic is common or where vehicle clearance is required. Ground anchors are acceptable in sparsely populated locations or rural areas. Where ground anchors are used adequate protective measures, in accordance with details provided on drawing 61501, shall be employed to warn people of the presence of stay wires or to protect the wire from damage by livestock, etc.

Where stays are used, they shall normally be designed and installed to adequately counter the full resultant conductor tension. However, designs which share the resultant conductor tension between the pole which is stayed and the stay wire may be approved by Ausgrid.

The use of fully self supporting angle or termination poles is an acceptable alternative to the use of stays, although in locations where buried services or narrow footpaths mitigate large butt diameters, stay poles or ground anchors will be used.

13.8 Underbuilt/multiple circuits Any proposed use of a single pole line for under-built or multiple circuits, where one or more of the circuits will be privately owned or owned by an authority other than Ausgrid, must not proceed without written approval from Ausgrid. If approval is given, the approval may contain conditions additional to those specified in this Network Standard, including additional clearances, access and maintenance requirements.

Use of a single pole line for more than one Ausgrid circuit is generally acceptable. Shared circuits with low voltage construction will normally be permitted in all locations, other than for multi-pole structures (i.e. long spans). Shared 11kV or 22kV circuits (but not SWER lines) will also normally be acceptable, subject to clearances being maintained between circuits in accordance with Clause 13.3 of this Network Standard. The type of construction used for lower voltages shall be in accordance with Ausgrid's policy on use of overhead conductors, and relevant Network Standards (e.g. NS125 and NS126). Where conductive poles are used, the insulation rating of insulators used on lower voltage lines attached to the poles shall be determined from the results of the step and touch voltage calculations. For example, where pole ground potential rise is calculated to be 8kV, LV ABC conductors shall be secured to the pole using 11kV insulators. Where multiple circuits are to be constructed on the same structures, the construction shall be in accordance with Ausgrid drawings. Any proposed use of construction types not specified in the Network Standards shall be submitted for approval with sufficient time for review by Ausgrid in accordance with the requirements of NS181.

Two sub-transmission circuits shall not normally be permitted on the same line of structures. Approval may be granted for a shared line in rural areas or areas where congestion restricts the number of available routes, provided the two lines do not supply the same load area. Ausgrid advice shall be sought in such cases as to whether allowance is required for climbing of live structures.

Structure sharing may be undertaken by either running the lower voltage circuit below the higher voltage circuit, or by having the two circuits side by side. If they are to be placed side by side, the design shall take into account the need to replace insulators on one circuit while the other circuit is energised.



Double circuit lines are permitted on tower lines or where other structures have been designed as substantial structures which permit maintenance work to be carried out on one circuit while the second circuit remains energised.

13.8.1 Installation of Pole Substations on Transmission Poles Primarily due to pole size constraints but also to avoid Earth Potential Rise (EPR) issues, pole substations shall not be installed on 132kV or 66kV poles. Similarly, the installation of pole substations on 33kV poles should be avoided; however a pole substation may be installed if it will fit on a standard size transmission pole as used by Ausgrid, and a site specific investigation confirms that there are no unacceptable EPR issues.

13.8.2 Installation of 11kV or LV UGOHs on transmission poles Refer to Ausgrid Network Standards on limitations on erection of lower voltage UGOHs on transmission poles – especially conductive poles. In accordance with NS126, 11kV UG/OH must never be constructed on concrete or steel poles which also carry sub-transmission (i.e. 33kV, 66kV or 132kV) mains. This is due to the transferred voltage and earth potential rise hazards associated with faults on the sub-transmission mains which may affect the 11kV mains.

13.9 Insulation co-ordination In general, Ausgrid’s overhead line designs and standards are based on co-ordinated levels of insulation withstand voltages for the various line configurations and equipment types, together with the correct application of surge arresters. Failure performance of the installation is very adversely affected by apparently minor departures from construction standards affecting clearances or configuration. Compliance with Ausgrid’s requirements will be achieved by the use of the standard structures as shown in the Ausgrid drawings. Any proposed use of construction types not specified in the Design Brief shall be submitted for approval with sufficient time for review by Ausgrid in accordance with the requirements of NS181 and shall comply with the following requirements.

The basic insulation levels applying to the standard designs are in accordance with AS 1824 Insulation Co-ordination as shown in the Table 2 below:

Table 2 - Basic Insulation Levels

Lines Basic Insulation Level

33kV lines 200kV

66kV lines 350kV

132kV lines 650kV or 750kV (to be nominated in the Design Brief)

13.10 Earthing

13.10.1 General For fully shielded lines or lines using conductive poles, the design should include a calculation of step and touch potential rise at each structure and earth potential rise along the line. The design values should comply with the requirements of AS/NZS 7000. The completed line shall be tested for step and touch potential rises etc as per Section 18.0, to confirm the design. Also refer to HB 331.

Where construction is in the vicinity of a major substation, installations should also comply with ENA EG1 Substation Earthing Guide.

Reference should also be made to ENA EG-0 Power System Earthing Guide Part 1: Management Principles.

13.10.2 Positioning of kiosks close to 132kV OH lines Due to Earth Potential Rise (EPR) risks associated with 132kV lines, kiosks must generally be located at least 20 metres from the nearest 132kV pole or structure. Locations within 20 metres of 132kV poles will only be considered where there is no other suitable alternative location available, and a proposal must be submitted to the Project Officer, including calculations of transferred



potentials and EPR levels at the kiosk earth mat, based on results of the calculations described in Clause 13.10.1

13.11 Electrical protection Determination of protection requirements for overhead sub-transmission lines is not contestable. Determination of protection settings and setting of the protection relays at Ausgrid’s installations shall be carried out by Ausgrid.

13.12 Voltage support, line losses and line regulation Especially for longer lines, designs shall include assessment of voltage support and line regulation. Conductor sizes shall be selected to ensure regulation is kept within defined limits and use of transposition structures shall be incorporated as necessary for lines over approximately 30 km in length.

Design shall also ensure that line losses are kept within the specified limits. Where appropriate to the proposed line, information on limits to losses or regulation shall be nominated in the Design Brief. As structure design is limited to those available in the associated structure drawings, the designer will have limited scope for varying the lines performance other than by conductor selection and use of transposition structures. If it is considered difficult to achieve the nominated voltage and loss criteria, the Designer should raise the issue with Ausgrid's Representative, providing calculations that demonstrate the constraints encountered.

13.13 Design parameters The design of OH sub-transmission mains shall be generally in accordance with AS/NZS 4676 and AS/NZS 7000. Also refer to HB 331.

Designs shall also be in accordance with the specific requirements indicated in NS220.

To help prevent conductor clashing and improve reliability, sub-transmission lines are to be designed and constructed with a default k factor of 0.6. Refer NS220 Section Engineering Notes and AS/NZS 7000:2010 Clause 3.7.3 for details.

For existing lines/spans where k is less than 0.6, up-rating to k = 0.6 should be undertaken whenever opportunities present themselves. In some cases this can be achieved in conjunction with routine pole replacements by installing a different pole-top construction on the new pole e.g. replacing an existing 4-1 Construction with a 4-6 Construction will increase k by a factor of 1.38 (i.e. increase k from 0.4 to 0.55) without changing the sag or tension of the conductors.

13.14 Foundation design Pole foundations shall be capable of withstanding loads specified for the ultimate strength limit state and serviceability limit state conditions.

Pole embedment depths shall be as indicated in NS220 Sections Pole Data and Foundations.

See AS/NZS 7000 for details of the Brinch-Hansen foundation design method and descriptions of soil type properties referred to in NS220. Also refer to HB 331.

13.15 Additional design information In order for Ausgrid to carry out certification checks for contestable works designs, and to minimise the design certification costs, the information listed in NS104 must be submitted by the Accredited Service Provider (ASP) in conjunction with the Network Project Design Plan.



14.0 ELECTRICAL SAFETY PROCEDURES

All work on or near the Ausgrid electrical network, which includes the Sub-transmission High Voltage and Low Voltage Distribution Systems as defined in this document, must comply with the Ausgrid Electrical Safety Rules.

All work must be in accordance with Ausgrid’s Be Safe Hazard Guideline HG-04: Electrical Safety.

15.0 MATERIALS, LINE EQUIPMENT AND APPLICATION TO DESIGN

15.1 General Unless prior written approval is received from Ausgrid, all materials used must be new and in accordance with Ausgrid’s specifications. Materials may be purchased directly from Ausgrid, as indicated in Clause 15.10.

Where the Client or Accredited Service Provider (ASP) wishes to use materials not supplied or already approved by Ausgrid, they must submit details in accordance with the requirements of NS181 Approval of Materials and Equipment and Network Standard Variations. Materials approved by Ausgrid under this process are listed in the regularly updated NSA 1343.

15.2 Conductors The Design Brief shall specify either the loading and voltage drop requirements for the circuit to be constructed, or the conductor to be used. The standard conductor sizes used on Ausgrid's overhead sub-transmission system are listed in the Table below.

Table 3 - Standard Conductor Sizes

Conductor 33kV 66kV 132kV

Aluminium (AAC) 7/4.50(Mercury), 19/3.75(Pluto),

37/3.75(Triton), 61/3.25 (Uranus).

7/4.50(Mercury), 19/3.75(Pluto), 37/3.75(Triton),

61/3.25 (Uranus).

61/3.25 (Uranus).

Aluminium Alloy (AAAC1120)

61/3.25 (Selenium).

ACSR/GZ 6/4.75+7/1.60 (Cherry). 6/4.75+7/1.60 (Cherry). 54/7/3.50 (Olive), 30/7/3.50 (Lime).

Notes: For overhead earth wires refer to Clause 15.3.

Where work is done on existing lines and additional or replacement conductors are required, the existing conductor size or the next higher conductor size may be used, unless the Design Brief indicates otherwise.

15.3 Overhead earth wires and telecommunications cables

15.3.1 General Overhead earthwires (OHEW) shall generally be erected in accordance with the following guidelines. Any variations to these must be stipulated in the project specific Design Brief. Ausgrid policy is that all new OHEW shall be 60 fibre optical pilot ground wire (OPGW) – refer general design and optical data tables below.

15.3.2 Optical pilot ground wire (OPGW) Where OPGW is installed, coils shall be provided at substation terminal structures, known fibre connection points and approximately every 1000 metres in urban areas. In rural areas coils shall be provided as specified on a case-by-case basis by Ausgrid. Tower structures may have different



requirements depending on the specific project. The coils are required to reach the ground plus 20 metres to permit connections to be made at ground level.

For all new OPGW installations, a Fibre Optic Cable Name/number shall be allocated to it. Fibre Optic Cable Names/numbers are obtained from the Optic Fibre Cable Registries maintained by the Ausgrid’s Manager responsible for Telecommunications Standards. The Fibre Optic Cable Name/number is to be allocated irrespective of whether the OPGW is to be used immediately for communications purposes or not.

If an additional communications circuit is to be established in conjunction with the project, this shall generally be specified in a separate Telecommunications Brief – Physical Infrastructure. If the Design Brief or Telecommunications Brief does not provide specific requirements, refer to NS203 Telecommunications Network: Master Policy Document for information on the choice between OPGW and All Dielectric Self Supporting (ADSS) cable, risk associated with two communication paths on the same pole and other related issues.

15.3.3 Overhead earthwires (OHEW) On 132kV lines, the OHEW shall be erected for the whole length of the line.

On 66kV lines designed using horizontal post insulator construction; the OHEW shall be erected for the whole length of the line.

On 66kV and 33kV lines erected on conductive structures, the OHEW shall be erected for the whole length of the line.

On other 66kV lines and 33kV lines, the OHEW shall be erected for the whole length of line unless otherwise specified in the Design Brief.

For 33kV lines where it is specified that OHEW is not to be erected for the whole length of line; OHEW shall be erected for at least 1600 metres from each substation connected to the line. Each OHEW shall be terminated on a ‘straight through’ pole, at least two spans beyond the previous line termination structure. Where this would result in a section of line of route length 300 metres or less between OHEW terminations, then the OHEW shall be joined through.

For 66kV lines where it is specified that OHEW is not to be erected for the whole length of line as indicated above, then OHEW shall be erected for at least 800 metres from each substation connected to the line. Each OHEW shall be terminated on a ‘straight through’ pole, at least two spans beyond the previous line termination structure. Where this would result in a section of line of route length 300 metres or less between OHEW terminations, then the OHEW shall be made continuous from end to end.

On double circuit tower lines, two OHEWs shall be erected - one above each circuit - for the whole length of the line. For horizontal multi-pole construction at any voltage, at least two OHEWs shall be used - one erected at the top of each pole. Where three-pole structures are erected on a predominantly two-pole structure line, the two OHEWs shall be attached to the two outer poles of the three-pole structure. Where very long spans such as gully crossings or waterway crossings necessitate three-pole structures at either end of a span, then a third OHEW shall be erected for that span. The third OHEW shall be bonded to the other two OHEWs at each end of the section of line using three poles.

An OHEW may be erected for greater or lesser distances on any line, depending on the circumstances or local requirements. For example, an OHEW may be erected on exposed lines to reduce the number of lightning induced outages. Refer to the Design Brief for additional information.

An earth connection shall be made at every structure supporting an OHEW, in accordance with the appropriate earthing arrangement drawings specified on each standard construction drawing as listed in Annexure D.

15.3.4 Buried earth electrodes Buried earth electrode and conductor systems shall be in accordance with the requirements of NS116 Design Standards for Distribution Equipment Earthing.



15.3.5 Earth fault study For 132kV lines (and lower voltage lines when specified in the Design Brief), an earth fault study shall be conducted for the length of the proposed route, and prospective step and touch potentials, and earth potential rise determined. The required earthing resistance of each earth connection shall be determined from this report and included in the line schedule. Step and touch potential voltages, and earth potential rise shall not exceed the values specified in AS/NZS 7000, or as otherwise specified in the Design Brief. Where construction is in the vicinity of a major substation, installations should also comply with the ENA EG1 ‘Substation Earthing Guide’. Also refer to HB 331.

Where conductive poles are used, the insulation rating of insulators used on lower voltage lines attached to the poles shall be determined from the results of the step and touch voltage calculations. For example, where pole ground potential rise is calculated to be 8kV LV ABC conductors shall be secured to the pole using 11kV insulators. See Clause 13.9, Insulation Co-ordination.

15.3.6 OPGW data Table 4 - OPGW General Design Data (For Information Only)

Description Measurement 60 fibre OPGW

Nominal Cross Sectional area mm² 131

Centre- Stainless Steel Tube –No./Dia. mm 1/4.1

L1- Aluminium Clad Steel Wires –No./Dia.(20%)

mm 4/2.55

L1- Aluminium Alloy Wires –No./Dia. mm 4/2.55

L2- Aluminium Alloy Wires –No./Dia. mm 12/3.1

Lay Direction - Outer Layer LEFT HAND

Overall Diameter mm 15.4

Calculated Breaking Load kN 60.2

Approximate Total Mass kg/km 475

Electrical Resistance at 20º C Ω/km 0.276

Modulus of Elasticity N/mm² 77,543

Coefficient of Linear Expansion x10-6/0C 19.8

Short Circuit Current Capacity kA²S 150 (@40oC)

Table 5 - OPGW Optical Data

Description Measurement Value

Optical Fibre Type - Single Mode G.652D

Mode Field Diameter-1310nm μm 9.2±0.4

Mode Field Diameter-1550nm μm 10.4±0.8

Cladding Diameter μm 125.0±1.0

Core-Clad Concentricity μm ≤ 0.5

Cladding Non-Circularity % ≤ 1.0

Coating Diameter μm 245±5

Coating-Cladding Concentricity μm <12

Attenuation Coefficient - 1310nm dB/km ≤0.35

Attenuation Coefficient -1550nm dB/km ≤0.22

Cable Cut-Off Wavelength nm ≤1260



Description Measurement Value

Zero Dispersion Wavelength nm 1300-1324

Zero Dispersion Slope ps/nm².km ≤0.092

15.4 Above ground and underground telecommunications system Transmission lines can impact telecommunications systems through induced and applied voltages and currents. Locations of particular concern are in the vicinity of UGOH structures, telephone exchanges near new lines, or situations where copper communications lines run parallel to transmission lines for distances greater than 100 metres. All lines must comply with the requirements of the following standard Australian publications:

HB 87 Joint use poles: the placement on power poles of powerlines and paired cable telecommunications lines

HB 88 Unbalanced high voltage powerlines: code of practice for the mitigation of noise induced into paired cable telecommunication lines from unbalanced high voltage powerlines.

HB 101 Co-ordination of power and telecommunications - Low Frequency Induction (LFI): code of practice for the mitigation of hazardous voltages induced into telecommunications lines

HB 102 Co-ordination of power and telecommunications - Low Frequency Induction (LFI): application guide to the LFI code

HB 103 Co-ordination of power and telecommunications - crossing code: the arrangement of overhead power and telecommunications lines, pole stay wires and suspension wires

Where lines are to be constructed close to or crossing rail corridors, the location of railway communications circuits must also be determined and considered.

15.5 Poles

15.5.1 Pole types Pole types should be chosen to suit the situation as outlined in the following table:

Table 6 - Pole Type and Situation

Pole Type Situation

“Regal” species (non CCA) timber

Normally most appropriate for developed urban areas where spans are shorter to accommodate lower voltage underbuild, narrow footpaths, lower tensions and step and touch potential hazards.

CCA timber Has larger butt sizes and is more conductive than non CCA Regal species – more suited to locations where footpath space is not as critical and where step and touch potential hazards do not exist.

Steel or spun-reinforced, pre-stressed concrete

These poles are generally higher strength and length than timber and are generally preferred in non-urban or non-street locations where longer spans and higher tensions are more appropriate.

Underground to overhead (UGOH)

Shall be either concrete or steel.

Note: In all cases special circumstances may mitigate against the preferred option indicated above therefore details shall be determined on a project by project basis and specified in the Design Brief.

Where a new line uses the route of an existing line to some extent, the existing poles shall be used where suitable. If this results in a predominantly timber line, then any new poles should also be



timber, although concrete poles may be used where access or environmental conditions make it more appropriate. Concrete poles may be used on a timber pole line if the earthwire runs the entire length of the line, subject to the policy on conductive poles. See Clause 15.3.

All wood poles must comply with NS128.

Pole heights used for new designs should be limited to the pole sizes on Ausgrid’s current pole contracts. Taller than normal poles may be impossible to maintain or work on if not accessible by Ausgrid Elevating Work Platforms (EWPs).

15.5.2 Inspection of timber poles prior to delivery Ausgrid retains a Timber Inspector who approves all timber poles prior to their being delivered to Ausgrid. Where poles are not purchased from Ausgrid, the Client shall advise Ausgrid's Timber Inspector of the supplier and other details so that he may approve all poles selected for use on Ausgrid's network, in accordance with NS128. Approval of poles shall be made prior to CCA or other treatment.

15.5.3 Inspection of concrete poles prior to delivery Concrete poles (and piles) are to be inspected and assessed in accordance with NEG OH22.

15.5.4 Pole steps Pole steps are generally not required. However where they are required they shall be installed starting 6 metres above ground level and spacing and placement shall be in accordance with structure drawings. See also NS128 for further details. For concrete poles, ferrules will be necessary, with the step bolts installed as required.

15.5.5 Painting of poles It is Ausgrid’s policy that non-timber poles may be painted in response to stakeholder negotiations in the design stage. However Ausgrid will not generally maintain the painted surface as it ages.

The paint and colour to be used will be in accordance with Ausgrid’s current specification.

15.6 Line insulators Line insulators shall be in accordance with Ausgrid's current purchasing specification. For post insulator lines, preference shall be given to polymeric insulators over porcelain. For other situations, preference shall be given to polymeric long rod insulators over porcelain. Glass discs may be used in tension strings for tower lines or pole lines using high design tensions. Where pin insulators are used, aerodynamic types shall be employed.

15.7 Line switches Line switches shall only be used with 33kV rural lines (including those on Kooragang Island), and 66kV rural lines in some circumstances. They shall be in accordance with Ausgrid's present procurement specification, and shall be erected in accordance with relevant structural drawings. Line switches must be erected in locations accessible to non four wheel drive vehicles in all weather conditions wherever possible.

15.8 Surge diverters Surge diverters shall be in accordance with the current Ausgrid specification. The placement of the surge diverters shall be as specified or approved by Ausgrid.

15.9 Disposal of recovered materials The Client shall be responsible for the disposal of all recovered materials unless otherwise noted in the Design Brief. Disposal shall be in accordance with relevant environmental legislation. Refer to NS174.

15.10 Issue of materials from Ausgrid Where the customer elects to purchase materials from Ausgrid; the Project Manager must contact the "Manager – Customer Service – Logistics" on telephone number (02) 9394 6034. All materials will generally be made available for the Client to pick up from:



Central Warehouse 33 Kangoo Road Somersby NSW 2250

15.11 Materials not obtained from Ausgrid All materials for use on Ausgrid’s network must be new and comply with Ausgrid’s specifications.

Only products approved by Ausgrid are to be used on the network. Ausgrid should be contacted regarding approved products. Alternative products may be submitted to Ausgrid for approval in accordance with the requirements of NS181 ‘Approval of Materials and Equipment and Network Standard Variations’. Payment of a fee for the assessment of alternative products for use on the network will be required.

16.0 DESIGN DOCUMENTATION

The Client shall submit a design to Ausgrid containing at least the following information:

Pole Strength Summary Check Sheet – To facilitate design auditing regardless of the design software used, a pole strength check sheet (in Microsoft Excel format) shall be provided, in the form shown in Annexure A. In addition, all design checks and calculations supporting the summary sheet are to be provided

Line Schedule – A list of all structures shall be provided, showing structure number, construction types for each voltage, pole type, pole size and mechanical rating, span lengths, progressive line length, phase and OHEW conductor, equivalent span length and tension within each tension section, design temperatures and minimum design clearances, structure footing impedance and any comments such as access details and non standard features of the structure. Refer to Annexure B for line schedule templates.

Property Schedule - Where easements are to be acquired or land purchased, a property schedule shall be prepared, giving details of the Lot and DP numbers of all properties affected, name, postal address and contact phone number of property owners, and comments on the nature of the interest to be obtained and any agreements made with the property owner, such as access conditions, disposal of vegetation removed during line construction etc.

Route Plan – A route plan shall be provided showing the route of the line, with all structures shown in their required location. Each structure shall have the structure number marked beside it. The route plan shall be provided in paper form and electronic form compatible with Ausgrid's Geographic Information System. The route plan shall also show the start and end points of the proposed line, the underlying cadastral information, and any access routes.

Line Profile – A profile of the line along its whole route shall be provided. The profile shall show the ground profile including any significant changes in levels, obstacles, locations of road carriageways, all line structures, intermediate structures or obstacles, and conductor curves. The conductor curves shall show all conductors and a clearance line at maximum operating temperature, and an uplift line at minimum operating temperature. The drawing shall conform to AS1100.

Overhead Design Electronic Files – To assist with assessing designs, the relevant overhead design files (from the overhead line design software package used), and digital terrain survey file should be submitted along with the drawings and other information discussed above.

Environmental Documentation – A copy of any Environmental Impact Assessment and Department of Planning requirements for the project.

Where the section of line is short, or is wholly on public roads, or on a single property, Ausgrid may relax some of the above requirements. The Design Brief will indicate if any of these requirements have been relaxed.



17.0 CONSTRUCTION

17.1 General The Client shall carry out all construction work in accordance with relevant legislation and Network Standards. An Environmental Management Plan (EMP) will be required for construction activities. A site specific EMP is to be prepared in accordance with Ausgrid and Department of Planning guidelines. The EMP will detail how the works will be undertaken to comply with all environmental laws, Ausgrid’s Environmental Policy and the mitigation measures described in the environmental assessment. Work shall be in accordance with the requirements of Ausgrid's Safety and Operating Plan, ENA Doc 01 and relevant Be Safe Procedures and Hazard Guidelines (e.g. Pro-10: Managing WHS Risk Procedure, HG-17: Working at Heights, etc)

Plant and equipment used shall be appropriate for the work and in good condition. Staff shall be suitably trained and authorised for tasks undertaken.

Unless otherwise approved by Ausgrid’s manager responsible for the approval of overhead sub-transmission mains designs, construction shall be in accordance with the design approved by Ausgrid.

17.2 Access roads Construction on easements and along non-trafficable routes will normally require the construction of access roads. The Client shall be responsible for obtaining all approvals required for access roads, and for construction of access roads, unless specified otherwise in the Design Brief.

If a line easement does not provide a suitable means of access for construction work and later maintenance work on the line, the Client must negotiate and construct a suitable right-of-way or rights-of-way prior to line construction, and the right(s)-of-way must be registered on the relevant land title(s) with Ausgrid being the beneficiary.

Refer to NS143 ‘Easements, Leases and Rights of Way’ for details of right-of-way requirements.

17.3 Admittance to Ausgrid’s premises Admittance to Ausgrid’s substations is not normally granted to Accredited Service Providers (ASPs) and work on substation sites is normally undertaken by Ausgrid or Ausgrid Contractors.

17.4 Work near underground cables When work is being carried out near* Ausgrid’s cables, the Client shall comply with the requirements of NS156 ‘Working Near or Around Underground Cables’. When work is being carried out near* cables operating at 33kV and above, the Client must pay Ausgrid for attendance of Ausgrid’s representative.

Sinking of pole holes near* underground cables must comply with these requirements.

Note: *The word ‘near’ is as defined in NS156.

17.5 Management of work The Client shall ensure that all works are undertaken in accordance with all relevant Acts, Regulations and Codes, including, for example, provision of safety fencing, lighting, and control of spoil.

17.6 Traffic plans Where required by an authority empowered to do so, the Client shall prepare and submit traffic control plans to that authority.

17.7 Pole erection All pole positions shall be pegged prior to commencement of hole boring. Where there is any uncertainty about the location of property boundaries, road alignments or kerb positions, the pole position shall be pegged by the surveyor. The construction plan or line schedule must indicate the position of the pole relative to the property line and kerb line (where available). Where property



lines and kerb lines are not available, a position derived from Global Positioning System (GPS) must be given.

If pole positions are found to be too close to services to allow safe excavation and alternative locations are suitable, then the pole position shall be relocated and the design amended.

Pole hole boring and pole erection shall be in accordance with NS128. For pole lengths outside the range nominated in NS128, embedment depths shall be specified in the line schedule for the project.

Also refer to Clause 17.4 regarding pole erection near underground cables.

17.8 Conductor stringing Conductors shall normally be erected using tension stringing. Stringing using helicopters is permitted where appropriate. Use of the layout (or ‘payout’) method may be permitted in certain circumstances, but must be approved by Ausgrid’s representative prior to being used. Where the layout method is used, adequate measures shall be taken to prevent conductors suffering mechanical damage such as scratching or deformation.

Stays shall be erected where required, as specified by the design, and prior to conductor stringing to ensure no poles or foundations are over-stressed.

17.8.1 Use of hurdles Where new (or replacement) conductors are to be strung crossing existing circuits that must remain in service for part or all of the stringing operations (e.g. where stringing is likely to take more than one day), temporary hurdles may be required to protect the in-service mains from falling conductors. While it is not possible to prescribe requirements for hurdles since conditions will vary with road and network configuration, topography etc., the principle functional requirements for the hurdle design are as follows:

The hurdle shall be capable of catching and supporting any conductor of the new/re-conductored span and keep it at least the minimum safe approach distance away from the in-service conductors. If the upper conductor of the in-service circuits is an overhead earthwire, a minimum clearance of one metre shall be maintained in the event of a fallen conductor.

The hurdle shall be strong enough to support the maximum number of conductors likely to be pulled at one time under the worst conditions likely to be encountered (i.e. position in conductor pull that maximises the weight of the conductor the hurdle must support). Strength calculations shall allow for the maximum permissible wind speed under which conductor stringing is permitted to be undertaken.

The hurdle shall be structurally stable so that in the event of a fallen conductor, it is not prone to lean dangerously towards the in-service mains or fall onto roads or adjacent land.

The hurdle supports shall be located no closer to the in-service conductors than the minimum safe approach distances specified in Ausgrid’s Electrical Safety Rules for the highest voltage of the in-service mains.

The webbing or supporting mesh shall be non conductive.

Hurdles may also be required for crossings of major roads, depending on the requirements of the relevant roads authority.

17.9 Handling of polymeric insulators Polymeric insulators are less robust than conventional ceramic or glass insulators and damage during transport and installation may not be evident. Construction staff must be made aware of the necessary precautions to be observed while handling polymeric insulators and checked to ensure that appropriate methods are adopted. Refer to NSA 1494 ‘Polymeric Insulator Handling Guide’. Information on handling precautions is also included in a range of external documents, including the following:



CIGRE TB184 Composite Insulator Handling Guide

IEEE Std 987 IEEE Guide for Application of Composite Insulators

K-Line Insulators Handling Guide

Energised Line Working with Polymer Insulators for Voltages 60kV and Above – IEEE ESMOL Subcommittee 15.07 paper (2006)

18.0 COMMISSIONING TESTS

After completion of construction of a new section of overhead sub-transmission line, the following tests shall be completed.

For shielded lines, earth current injection tests shall be undertaken and measurements made at each support structure of the:

line of earth impedance, step and touch potentials, and earth potential rise

to confirm compliance with the requirements of AS/NZS 7000.

Note: AS/NZS 7000: Generally, low currents shall be used and scaled up to design earth fault levels.

This test shall be performed after the substation earth mats at all ends of the line are fully installed and connected. Where 11kV underground cables are to be connected to the zone substation, at least four feeder cables shall be connected prior to testing. If there are less than four feeders to be connected, then consideration must be given to the establishment of temporary additional earthing arrangements. All values measured shall be recorded and a copy submitted to Ausgrid’s manager responsible for assessing overhead sub-transmission mains test results. Zero sequence impedance measurements are also required, unless otherwise specified in the Design Brief.

When the line is first energised, radio frequency radiation measurements shall be made to ensure that any interference is less than the values specified in AS 2344 Limits of electromagnetic interference from overhead a.c. powerlines and high voltage equipment installations in the frequency range 0.15 MHz to 1000 MHz. Where interference exceeds these values, the sources of interference must be identified and corrective action taken before re-testing.

A phasing check shall be completed prior to commissioning to ensure that the phases are correctly aligned to synchronise with the network to which the line is to be connected. Immediately prior to commissioning the line, the entire route shall be patrolled and visually checked for any working earths left aloft, construction faults or damaged insulators. An insulation resistance check shall be completed to ensure no inadvertent short circuits.



19.0 FINAL PROJECT DOCUMENTATION

On completion of the construction of the new line, the following information shall be provided to Ausgrid. Refer also to NS212 Integrated Support Requirements for Ausgrid Network Assets for detailed information on documentation, spares and training required for new network assets.

The line schedule, profile, route plan and property schedule shall all be provided showing ‘as-built’ details. The route plan shall include structure numbers and shall be in paper form and electronic form compatible with Ausgrid’s GIS system. Refer to NS104 Specification Network Project Design Plans for further details.

Records of measurements made as detailed in Clause 20.2 shall be provided to Ausgrid, along with all commissioning test results from measurements taken in Section 18.

All drawings and plans associated with an OH Line project are to include the feeder number and source/destination substations to facilitate searching Ausgrid's document management system.

20.0 QUALITY

20.1 Design For contestable work, while the design remains the responsibility of the Accredited Designer, a copy of all design documentation shall be submitted to Ausgrid prior to construction commencing, and with sufficient time (normally two weeks) for the design to be audited and certified.

20.2 Construction The following information shall be recorded and made available to Ausgrid by Accredited Service Providers (ASPs).

During construction, records shall be made of the following information. A copy shall be provided to Ausgrid no later than three weeks after completion of the work.

Final height of lowest conductor above the ground at each pole or tower.

Actual tension measured in each stringing section at final tensioning. Conductor temperature at time of measurement. Structure at which tension is measured. This information, together with supporting information indicating line construction conditions and details at the time of measurement shall be provided in a Conductor Tensioning Report, as shown in Annexure C.

Clearance above ground or to mid-span structures at a sample of spans along the line.

The serial number and calibration date of all instruments used for recording the above measurements.

The ASP is responsible for the labour and material cost of replacement of any components found to be damaged prior to commissioning of the line. This includes damage by birds to polymeric insulators or other damage by flora, fauna, acts of nature or human acts.

20.3 Warranty A warranty shall be provided on all assets for which Ausgrid shall assume ownership on completion of the works, as per the relevant Ausgrid Offer and/or Contract for the works.



21.0 RECORDKEEPING

The table below identifies the types of records relating to the process, their storage location and retention period.

Table 7 – Recordkeeping

Type of Record Storage Location Retention Period*

Approved copy of the network standard

BMS Network sub process Standard – Company

Unlimited

Draft Copies of the network standard during amendment/creation

HPRM Work Folder for Network Standards (HPRM ref. 2014/21250/138)

Unlimited

Working documents (emails, memos, impact assessment reports, etc.)

HPRM Work Folder for Network Standards (HPRM ref. 2014/21250/138)

Unlimited

* The following retention periods are subject to change eg if the records are required for legal matters or legislative changes. Before disposal, retention periods should be checked and authorised by the Records Manager.

22.0 AUTHORITIES AND RESPONSIBILITIES

For this network standard the authorities and responsibilities of Ausgrid employees and managers in relation to content, management and document control of this network standard can be obtained from the Company Procedure (Network) – Production/Review of Network Standards. The responsibilities of persons for the design or construction work detailed in this network standard are identified throughout this standard in the context of the requirements to which they apply.

23.0 DOCUMENT CONTROL

Content Coordinator : Manager - Transmission and Distribution Mains Engineering

Distribution Coordinator : Senior Engineer – Guidelines, Policies and Standards



Annexure A – Pole Check Sheet



Annexure B – Line Schedule Formats

Pole line designs shall include a line schedule adopting the following format.

POLE CONSTRUCTION Remarks

Pole Number

Size (Height)

m

Ultimate Strength

(kN)

Working Strength*

(kN)

Type T/C/S

Auger Size (mm)

Pole Status (E/R/N)

Depth (m)

(specify highest voltage on pole)

Distance from Pole

Top

*Working strength values are required for comparison with existing naming practices for Ausgrid poles as an interim measure.

Support Type Codes Pole Status

T – Timber E – Existing pole

C – Concrete R – Replacement pole

S – Steel N – New pole

Designs for new work on tower lines shall generally follow the format used on the original designs – see example below.

Note: Use metric rather than imperial values shown below.



POLE

Number SIZE m

Strength kN

Type T/C/S

Butt Diammm

CONC mm

E/R/N Depth m

IR-82400 18.5 80 C 773 1200 N 3.60

IR-82340 21.4 40 C 680 900 R 3.20

IR-82338 24.0 80 C 840 1200 R 4.10

IR-82339 24.0 40 C 680 900 R 3.40

IR-82401 21.4 24 C 591 900 N 2.90

IR-82326 21.4 40 C 680 900 R 3.20

NS135 Specification for the Construction of Overhead Sub-transmission Lines

Amendment No 0


Annexure C – Conductor Tensioning Report

Overhead Mains Tensioning Report

Contractor / ASP: …………………………………………… Contract Name/Description: ………………………………………………

Contract No.: …………………………………………………Report No.: ………………………………………………………………..

Week Ending: …………………………………………………………………..

1. Tensioning Section

This tension section is from Structure No. ……………. to Structure No. …………….

2. Contract Reference Data 3. Sagging Checks

Contract Reference Data for Tension Section Drawing No. Sheet No. Revision No.

a. Selected spans for tension checks:

(1) Structure No. ………….. to Structure No. ……………

(2) Structure No. ………….. to Structure No. …………… Route Plan

Line structure

OHEW / OPGW Stringing Chart b. Control span is:

Structure No. ….. ……….. to Structure No. …………………,

Span length ……………….. metres

HV Phase Stringing Chart

Other Conductor Stringing Chart

NS135 Specification for the Construction of Overhead Sub-transmission Lines

Amendment No 0


4. Record of Sagging Actually Carried Out

Ambient Conductor Temp oC

Date/Time of Reading

Temp Curve Used on Chart

(From Stringing

Chart)

Equiv Span (m) (From

Line Schedule)

Date and Time

Sag in Control Span

% Sag Sag in Span (1) % Sag

Sag in Span (2) % Sag

Req’d Actual Req’d Actual Req’d Actual

OHEW OPGW Stringing Chart

HV Phase Stringing Chart

Other Conductors stringing Chart

Span length (m) …….. Span length (m) ……. Span length (m) ……

5. Declaration by Contractor

I declare that I am competent to sag conductors.

The above is submitted as a true and correct record of work

I submit and declare the sagging has been completed in accordance with correct design and sag tolerances specified.

……………………………………………. Date: …... / ..…. / ..…. Time: ….…….am/pm.

For the contractor (Supervisor)



Annexure D – POLE TOP CONSTRUCTION DRAWINGS

IMPORTANT: Users must ensure that the drawings they are using are the current versions with all amendments.

Drawing Number

Construction Code

Drawing Description

33kV Constructions

166244(1/2) 4-120 33kV UGOH CONSTRUCTION

166244(2/2) 4-120 33kV UGOH CONSTRUCTION

127143 4-11C THROUGH TERMINATION CONSTRUCTION ON CONCRETE POLE

127144 4-33C/E VERTICAL TERMINATION CONSTRUCTION WITH OVERHEAD EARTHWIRE ON CONCRETE POLE

166707 4-455 MID POLE OPERATED AIR BREAK SWITCH FOR TIMBER, CONCRETE AND STEEL POLES GENERAL ARRANGEMENT

174122 4-34C/E VERTICAL ANGLE POLE CONSTRUCTION WITH OVERHEAD EARTH WIRE ON CONCRETE POLE

174122 4-34C/E VERTICAL ANGLE POLE CONSTRUCTION WITH OVERHEAD EARTH WIRE ON CONCRETE POLE

174126 4-1C/E HORIZONTAL PIN CONSTRUCTION WITH OVERHEAD EARTHWIRE ON CONCRETE POLE

174127 4-8C/E DELTA CONSTRUCTION WITH OVERHEAD EARTHWIRE ON CONCRETE POLE

174128 4-9C/E DELTA CONSTRUCTION WITH OVERHEAD EARTHWIRE ON CONCRETE POLE

174181 4-10E TERMINATION CONSTRUCTION WITH OVERHEAD EARTHWIRE

174184 4-10C/E TERMINATION CONSTRUCTION WITH OVERHEAD EARTHWIRE ON CONCRETE POLE

174243 4-25C/E DELTA TERMINATION CONSTRUCTION WITH OVERHEAD EARTHWIRE ON CONCRETE POLE

174244 4-17C/E THROUGH TERMINATION TEE-OFF CONSTRUCTION WITH OVERHEAD EARTHWIRE ON CONCRETE POLE

174245 4-25E DELTA TERMINATION CONSTRUCTION WITH OVERHEAD EARTHWIRE

174380 4-27C/E DELTA CORNER POLE TERMINATION CONSTRUCTION WITH OVERHEAD EARTHWIRE ON CONCRETE POLE

174424 4-30E LARGE DELTA THOUGH TERMINATION CONSTRUCTION WITH OVERHEAD EARTHWIRE

174425 4-30C/E LARGE DELTA THOUGH TERMINATION CONSTRUCTION WITH OVERHEAD EARTHWIRE ON CONCRETE POLE

174426 4-31C/E LARGE DELTA CORNER POLE TERMINATION CONSTRUCTION WITH OVERHEAD EARTHWIRE ON CONCRETE POLE

174427 4-35E DELTA CONSTRUCTION WITH SUSPENDED OVERHEAD EARTH WIRE

174444 4-171 SUSPENSION CONSTRUCTION

185415 4-200 VERTICAL DELTA CONSTRUCTION

185416 4-200E VERTICAL DELTA CONSTRUCTION WITH OVERHEAD EARTH WIRE

185417 4-200C/E VERTICAL DELTA CONSTRUCTION WITH OVERHEAD EARTH WIRE ON CONCRETE POLE

185418 4-240 VERTICAL CONSTRUCTION

185419 4-240E VERTICAL CONSTRUCTION WITH OVERHEAD EARTH WIRE

185420 4-240C/E VERTICAL CONSTRUCTION WITH OVERHEAD EARTH WIRE ON CONCRETE POLE



Drawing Number

Construction Code

Drawing Description

33kV Constructions

185511 4-208E VERTICAL DELTA CONSTRUCTION WITH OVERHEAD EARTH WIRE ON BRACKET

185512 4-208C/E VERTICAL DELTA CONSTRUCTION WITH OVERHEAD EARTH WIRE ON BRACKET ON CONCRETE POLE

185513 4-208E VERTICAL CONSTRUCTION WITH OVERHEAD EARTH WIRE ON BRACKET

185514 4-208C/E VERTICAL CONSTRUCTION WITH OVERHEAD EARTH WIRE ON BRACKET ON CONCRETE POLE

513923 4-1 HORIZONTAL PIN CONSTRUCTION

513924 4-3 ANGLE SUSPENSION CONSTRUCTION

513925 4-5 SMALL DELTA CONSTRUCTION

513926 4-6 DELTA CONSTRUCTION

513927 4-7 LARGE DELTA CONSTRUCTION

513928 4-8E DELTA CONSTRUCTION WITH OVERHEAD EARTHWIRE

513929 4-10 TERMINATION CONSTRUCTION

513930 4-11 THROUGH TERMINATION CONSTRUCTION

513931 4-12 CORNER POLE TERMINATION CONSTRUCTION

513932 4-14 TEE-OFF CONSTRUCTION

513933 4-25 DELTA TERMINATION CONSTRUCTION

513934 4-26 DELTA THROUGH TERMINATION CONSTRUCTION

513935 4-28 RAILWAY DELTA TERMINATION CONSTRUCTION WITH RHS GALVANISED CROSSARM

513936 4-30 LARGE DELTA THOUGH TERMINATION CONSTRUCTION

513937 4-31 LARGE DELTA CORNER POLE TERMINATION CONSTRUCTION

513938 4-33 TERMINATION CONSTRUCTION

513944 4-27 DELTA TERMINATION CORNER POLE CONSTRUCTION.

513957 4-60 THROUGH TERMINATION WITH GREATER THAN 4kA DROPOUT FUSES

514039 4-2 OFFSET ARM CONSTRUCTION

514169 4-11E THROUGH TERMINATION CONSTRUCTION WITH OVERHEAD EARTHWIRE

514170 4-12E CORNER POLE TERMINATION CONSTRUCTION WITH OVERHEAD EARTHWIRE

514171 4-27E DELTA CORNER POLE TERMINATION CONSTRUCTION WITH OVERHEAD EARTHWIRE

514172 4-31E LARGE DELTA CORNER POLE TERMINATION CONSTRUCTION WITH OVERHEAD EARTHWIRE

514173 4-26E DELTA THROUGH TERMINATION CONSTRUCTION WITH OVERHEAD EARTHWIRE

519448 4-33E VERTICAL TERMINATION CONSTRUCTION WITH OVERHEAD EARTHWIRE

519449 4-34E VERTICAL ANGLE POLE CONSTRUCTION WITH OVERHEAD EARTH WIRE

520242 4-11C/E THROUGH TERMINATION CONSTRUCTION WITH OVERHEAD EARTHWIRE ON CONCRETE POLE

520270 4-9E DELTA CONSTRUCTION WITH OVERHEAD EARTHWIRE

520271 4-17E THROUGH TERMINATION TEE-OFF CONSTRUCTION WITH OVERHEAD EARTHWIRE

520315 4-1 E HORIZONTAL PIN CONSTRUCTION WITH OVERHEAD EARTHWIRE



Drawing Number

Construction Code

Drawing Description

33kV Constructions

520388 4-131 POLE HEATSHRINK TERMINATION FOR 3 SINGLE CORE CABLES EARTH BONDED SCREEN SYSTEM

520409 4-34 VERTICAL ANGLE POLE CONSTRUCTION

520791 AIR BREAK SWITCH – ABB TYPE D746 MID POLE MOUNTED GENERAL ASSEMBLY

527025 4-130 POLE HEATSHRINK TERMINATION FOR 3 SINGLE CORE CABLES SINGLE POINT BONDED SYSTEM

565712 4-35C/E DELTA CONSTRUCTION WITH SUSPENDED OVERHEAD EARTH WIRE ON CONCRETE POLE

565739 4-12C/E CORNER POLE TERMINATION CONSTRUCTION WITH OVERHEAD EARTHWIRE ON CONCRETE POLE

565787 4-26C/E DELTA THROUGH TERMINATION CONSTRUCTION WITH OVERHEAD EARTHWIRE ON CONCRETE POLE

567078 4-171E SUSPENSION CONSTRUCTION WITH OVERHEAD EARTH WIRE

567079 4-171C/E SUSPENSION CONSTRUCTION WITH OVERHEAD EARTH WIRE ON CONCRETE POLE

66kV Constructions

166653 5-240S/E HORIZONTAL LINE POST ON ONE SIDE WITH OVERHEAD EARTH WIRE ON STEEL POLE

166782 5-140S/E VERTICAL THROUGH TERMINATION WITH OVERHEAD EARTH WIRE ON STEEL POLE - HIGH STAY

178000 5-200S/E STAGGERED HORIZONTAL LINE POST WITH OVERHEAD EARTH WIRE ON STEEL POLE

511786 5-21 'H' POLE SPECIAL TERMINATION STRUCTURE ON TIMBER POLES

514074 5-145C/E VERTICAL THROUGH TERMINATION WITH TERMINATED OVERHEAD EARTH WIRE ON CONCRETE POLE

514075 5-140C/E VERTICAL THROUGH TERMINATION WITH OVERHEAD EARTH WIRE ON CONCRETE POLE - HIGH STAY

514076 5-160C/E FLYING ANGLE SUSPENSION WITH OVERHEAD EARTH WIRE ON CONCRETE POLE

514077 5-140 VERTICAL THROUGH TERMINATION ON TIMBER POLE

514079 5-160 FLYING ANGLE SUSPENSION ON TIMBER POLE

514080 5-146 VERTICAL THROUGH TERMINATION WITH TEE-OFF ON TIMBER POLE

514139 5-148C/E DELTA THROUGH TERMINATION WITH OVERHEAD EARTH WIRE ON CONCRETE POLE

514141 5-146C/E VERTICAL THROUGH TERMINATION WITH TEE-OFF ON CONCRETE POLE

514144 5-146E VERTICAL THROUGH TERMINATION WITH TEE-OFF AND OVERHEAD EARTH WIRE ON TIMBER POLE

514150 5-140E VERTICAL TERMINATION WITH OVERHEAD EARTH WIRE ON TIMBER POLE - HIGH STAY

514153 5-160E FLYING ANGLE SUSPENSION WITH OVERHEAD EARTH WIRE ON TIMBER POLE

514159 5-200C/E STAGGERED HORIZONTAL LINE POST WITH OVERHEAD EARTH WIRE ON CONCRETE POLE

514162 5-200E STAGGERED HORIZONTAL LINE POST WITH OVERHEAD EARTH WIRE ON TIMBER POLE

514164 5-148 DELTA THROUGH TERMINATION ON TIMBER POLE

514182 5-250C/E HORIZONTAL LINE POST SUSPENSION CLAMPS ON CONCRETE POLE WITH OVERHEAD EARTH WIRE



Drawing Number

Construction Code

Drawing Description

33kV Constructions

518775 5-400C/E UNDERGROUND TO AERIAL TERMINATION ON CONCRETE POLE

520202 5-148E DELTA THROUGH TERMINATION WITH OVERHEAD EARTH WIRE ON TIMBER POLE

520205 5-180C/E TWIN CIRCUIT HORIZONTAL LINE POST SUSPENSION BRACKET OVERHEAD EARTH WIRE ON CONCRETE POLE

520230 5-240C/E HORIZONTAL LINE POST ON ONE SIDE WITH OVERHEAD EARTH WIRE ON CONCRETE POLE

520253 5-200 STAGGERED HORIZONTAL LINE POST ON TIMBER POLE

520310 5-21E 'H' POLE SPECIAL OVERHEAD EARTH WIRE TERMINATION STRUCTURE ON TIMBER POLES

520412 5-21C/E 'H' POLE SPECIAL OVERHEAD EARTH WIRE TERMINATION STRUCTURE ON CONCRETE POLES

203726 - STANDARD CONSTRUCTION SINGLE 66KV VERTICAL AIR BREAK SWITCH GENERAL ARRANGEMENT

203727 - STANDARD CONSTRUCTION SINGLE 66KV VERTICAL AIR BREAK SWITCH WITH TEE OFF GENERAL ARRANGEMENT

203728 - STANDARD CONSTRUCTION TWIN 66KV VERTICAL AIR BREAK SWITCH WITH TEE OFF GENERAL ARRANGEMENT

203729 - STANDARD CONSTRUCTION SINGLE 66KV VERTICAL AIR BREAK SWITCH WITH STABILISER BRACKET GENERAL ARRANGEMENT

132kV Constructions

181517 6-111C/E DUAL CIRCUIT TERMINATION

507773 WP-AA 'H' POLE SUSPENSION WITH CROSSARM ON TIMBER POLES 4.4 AND 5.4m CENTRES

507776 WP-BA 'H' POLE ANGLE SUSPENSION WITH CROSSARM ON TIMBER POLES

507777 WP-BB '3' POLE ANGLE SUSPENSION WITH CROSSARM ON TIMBER POLES

507778 WP-BC '3' POLE FLYING ANGLE ON TIMBER POLES

507780 WP-CA 'H' POLE TERMINATION WITH CROSSARM ON TIMBER POLES

507781 WP-CB 'H' POLE TERMINATION WITH CROSSARM ON TIMBER POLES

513049 RCP-AA 'H' POLE SUSPENSION WITH CROSSARM ON CONCRETE POLES

513051 RCP-BA 'H' POLE ANGLE SUSPENSION WITH CROSSARM ON CONCRETE POLES

513052 RCP-BB '3' POLE ANGLE SUSPENSION WITH CROSSARM ON CONCRETE POLES

514121 6-220C/E THROUGH TERMINATION WITH OVERHEAD EARTH WIRE ON CONCRETE POLE

514126 6-201C/E HORIZONTAL LINE POSTS WITH TWIN OVERHEAD EARTH WIRE TERMINATED ON CONCRETE POLE

514143 6-202C/E HORIZONTAL OVERLOAD RELEASE LINE POST WITH OVERHEAD EARTH WIRE ON CONCRETE POLE

514166 6-231C/E HORIZONTAL LINE POSTS SUSPENSION CLAMPS WITH OVERHEAD EARTH WIRE TERMINATED ON CONCRETE POLE

514186 6-230C/TE HORIZONTAL LINE POSTS SUSPENSION CLAMPS WITH TWIN OVERHEAD EARTH WIRE ON CONCRETE POLE

514187 6-202C/TE HORIZONTAL OVERLOAD RELEASE LINE POST WITH TWIN OVERHEAD EARTH WIRE ON CONCRETE POLE

514192 6-190C/E TWIN CIRCUIT HORIZONTAL WITH OVERHEAD EARTH WIRE ON CONCRETE POLES

514195 6-200E HORIZONTAL LINE POSTS WITH OVERHEAD EARTH WIRE ON TIMBER AND CONCRETE POLES

514196 6-201E HORIZONTAL LINE POSTS WITH TWIN OVERHEAD EARTH WIRE



Drawing Number

Construction Code

Drawing Description

33kV Constructions

TERMINATED ON TIMBER POLE

514198 6-210E FLYING ANGLE WITH OVERHEAD EARTH WIRE ON TIMBER OR CONCRETE POLE

514199 6-220E THROUGH TERMINATION ON TIMBER POLE WITH OVERHEAD EARTH WIRE

520223 6-260C/E HORIZONTAL LINE POSTS ON ONE SIDE AND INTERPOLE STAY WITH OVERHEAD EARTH WIRE ON CONCRETE POLE

520227 6-203E HORIZONTAL LINE POSTS WITH TERMINATED OVERHEAD EARTH WIRE ON TIMBER POLE

520228 6-200C/TE HORIZONTAL LINE POSTS SUSPENSION WITH TWIN OVERHEAD EARTH WIRE ON CONCRETE POLE

520229 6-240C/E HORIZONTAL LINE POSTS ON ONE SIDE WITH SUSPENSION OVERHEAD EARTH WIRE ON CONCRETE POLE

520254 6-262C/E HORIZONTAL OVERLOAD RELEASE LINE POST ON ONE SIDE AND INTERPOLE STAY WITH OVERHEAD EARTH WIRE ON CONCRETE POLE

520300 6-270C/E HORIZONTAL LINE POST TWO SIDE SUSPENSION CLAMPS CONCRETE POLE WITH SUSPENSION OVERHEAD EARTH WIRE ON CONCRETE POLE

520301 6-278C/E HORIZONTAL LINE POST TWO SIDE SUSPENSION CLAMPS WITH 2 CLAMPED OVERHEAD EARTH WIRES ON CONCRETE POLE

520308 6-283C/E HORIZONTAL LINE POST AND FLYING ANGLE WITH 2 OVERHEAD EARTH WIRES ON CONCRETE POLE



Annexure E – Sample Compliance Checklist

Network Standard - Ausgrid€¦ · OPGW design information and other telecommunication systems...

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