AS NZS 3835.1-2006 Earth potential rise - Protection of telecommunications network users, personnel and plant

CONTENTS

	Page
FOREWORD	5
SECTION 1 SCOPE AND GENERAL
1.1 SCOPE	6
1.2 EXCLUSIONS	6
1.3 APPLICATION	7
1.4 GENERAL	7
1.5 REFERENCED DOCUMENTS	8
SECTION 2 DEFINITIONS
2.1 DEFINITIONS RELATING TO POWER SYSTEMS	10
2.2 DEFINITIONS RELATING TO HV CIRCUITS	11
2.3 DEFINITIONS RELATING TO HV INSTALLATION EARTHING	12
2.4 DEFINITIONS RELATING TO EARTH POTENTIALS	13
2.5 DEFINITIONS RELATING TO TELECOMMUNICATIONS	14
SECTION 3 EPR COORDINATION—PRINCIPLES AND PROCEDURES
3.1 EPR HAZARD INVESTIGATION	15
3.2 PLANNING	15
3.3 CONSIDERATION OF POWER UTILITY CONSTRUCTION PROPOSALS	16
3.4 CONSIDERATION OF TELECOMMUNICATIONS CARRIER CONSTRUCTION PROPOSALS	17
3.5 AGREEMENT ON SOLUTION	17
3.6 MINIMIZATION OF COSTS	17
SECTION 4 EPR HAZARD VOLTAGE LIMITS
4.1 AUSTRALIAN EPR HAZARD VOLTAGE LIMITS	18
4.2 NEW ZEALAND EPR HAZARD VOLTAGE LIMITS	18
SECTION 5 ASSESSMENT OF EPR
5.1 INTRODUCTION	20
5.2 CONSIDERATION IN CONJUNCTION WITH LOW FREQUENCY INDUCTION (LFI)	20
SECTION 6 FIELD TESTS AND MEASUREMENTS
6.1 GENERAL	21
6.2 SAFETY PRECAUTIONS	21
SECTION 7 MITIGATION
7.1 INTRODUCTION	22
7.2 SCOPE OF MITIGATION	22
7.3 MITIGATION MEASURES	22
7.4 MITIGATION MEASURES APPLIED TO THE POWER SYSTEM PLANT	23
7.5 MITIGATION MEASURES APPLIED TO TELECOMMUNICATIONS PLANT	23

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Australian/New Zealand Standard™

Earth potential rise—Protection of telecommunications network users, personnel and plant

Part 1: Code of practice

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AS/NZS 3835.1:2006

This Joint Australian/New Zealand Standard was prepared by Joint Technical Committee ET-007, Coordinating Committee on Power and Telecommunications (CCPT). It was approved on behalf of the Council of Standards Australia on 10 April 2006 and on behalf of the Council of Standards New Zealand on 13 April 2006.

This Standard was published on 27 September 2006.

The following are represented on Committee ET-007:

Australian Communications and Media Authority

Co-opted Member

Electrical Regulatory Authorities Council

Energy Networks Association

NZCCEPTS

Telecommunications Carriers

Additional Interests:

Energenex

Queensland Rail

Electranet (South Australia)

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This Standard was issued in draft form for comment as DR 04471.

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Australian/New Zealand Standard™

Earth potential rise—Protection of telecommunications network users, personnel and plant

Part 1: Code of practice

First published as AS/NZS 3835.1:2006.

COPYRIGHT

© Standards Australia/Standards New Zealand

All rights are reserved. No part of this work may be reproduced or copied in any form or by any means, electronic or mechanical, including photocopying, without the written permission of the publisher.

Jointly published by Standards Australia, GPO Box 476, Sydney, NSW 2001 and Standards New Zealand, Private Bag 2439, Wellington 6020

ISBN 0 7337 7407 5

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PREFACE

This Standard was prepared by the Joint Standards Australia/Standards New Zealand Technical Committee ET-007-01, Earth Potential Rise, a Joint Committee for the Coordination of Power and Telecommunications Systems.

In Australia, this Standard supersedes the EPR Code, Issue 1, 1984, published jointly by the Australian Telecommunications Commission (now Telstra Corporation), and ESAA (now ENA-Energy Networks Association).

In New Zealand, this Standard supersedes the Application guide for EPR, 1989, published by the New Zealand Committee for the Co-ordination of Power and Telecommunications Systems (NZCCPTS).

The objective of this part of AS/NZS 3835 is to identify and minimize hazards to telecommunications personnel, users and plant caused by earth faults on high voltage a.c. power systems.

Preparation of this Standard was undertaken to update the technical content of the original EPR Code and to remove those contractual and procedural matters better dealt with elsewhere.

This Standard makes reference to publications prepared by the NZCCPTS. Enquiries concerning these publications should be directed to the secretary of NZCCPTS. Contact details for the secretary and details of NZCCPTS publications are available at the web site http://www.nzccpts.co.nz. Some of the publications are available as free downloads from the above web site.

This Standard is Part 1 of a series dealing with Earth Potential Rise (EPR). This Standard when complete will consist of the following parts:

AS/NZS 3835	Earth potential rise—Protection of telecommunications network users, personnel and plant
3835.1	Part 1: Code of practice (this Standard)
3835.2	Part 2: Application guide
3835.3	Part 3: Isolation arrangements for paired cable telemetering telecontrol service in LV areas and HV sites
HB 219	Earth potential rise—Protection of telecommunications network users, personnel and plant—Worked examples for the application guide

The terms ‘normative’ and ‘informative’ have been used in this Standard to define the application of the appendix to which they apply. A ‘normative’ appendix is an integral part of a Standard, whereas an ‘informative’ appendix is only for information and guidance.

Statements expressed in mandatory terms in notes to figures, are deemed to be requirements of this Standard. ‘Shall’ indicates a requirement is mandatory, while ‘should’ indicates a recommendation and good practice.

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CONTENTS

	Page
FOREWORD	5
SECTION 1 SCOPE AND GENERAL
1.1 SCOPE	6
1.2 EXCLUSIONS	6
1.3 APPLICATION	7
1.4 GENERAL	7
1.5 REFERENCED DOCUMENTS	8
SECTION 2 DEFINITIONS
2.1 DEFINITIONS RELATING TO POWER SYSTEMS	10
2.2 DEFINITIONS RELATING TO HV CIRCUITS	11
2.3 DEFINITIONS RELATING TO HV INSTALLATION EARTHING	12
2.4 DEFINITIONS RELATING TO EARTH POTENTIALS	13
2.5 DEFINITIONS RELATING TO TELECOMMUNICATIONS	14
SECTION 3 EPR COORDINATION—PRINCIPLES AND PROCEDURES
3.1 EPR HAZARD INVESTIGATION	15
3.2 PLANNING	15
3.3 CONSIDERATION OF POWER UTILITY CONSTRUCTION PROPOSALS	16
3.4 CONSIDERATION OF TELECOMMUNICATIONS CARRIER CONSTRUCTION PROPOSALS	17
3.5 AGREEMENT ON SOLUTION	17
3.6 MINIMIZATION OF COSTS	17
SECTION 4 EPR HAZARD VOLTAGE LIMITS
4.1 AUSTRALIAN EPR HAZARD VOLTAGE LIMITS	18
4.2 NEW ZEALAND EPR HAZARD VOLTAGE LIMITS	18
SECTION 5 ASSESSMENT OF EPR
5.1 INTRODUCTION	20
5.2 CONSIDERATION IN CONJUNCTION WITH LOW FREQUENCY INDUCTION (LFI)	20
SECTION 6 FIELD TESTS AND MEASUREMENTS
6.1 GENERAL	21
6.2 SAFETY PRECAUTIONS	21
SECTION 7 MITIGATION
7.1 INTRODUCTION	22
7.2 SCOPE OF MITIGATION	22
7.3 MITIGATION MEASURES	22
7.4 MITIGATION MEASURES APPLIED TO THE POWER SYSTEM PLANT	23
7.5 MITIGATION MEASURES APPLIED TO TELECOMMUNICATIONS PLANT	23

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