• AS/NZS 3835.2:2006

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    Earth potential rise - Protection of telecommunications network users, personnel and plant Application guide

    Available format(s):  Hardcopy, PDF 1 User, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Language(s):  English

    Published date:  09-27-2006

    Publisher:  Standards Australia

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    Table of Contents - (Show below) - (Hide below)

    1 - AS/NZS 3835.2:2006 EARTH POTENTIAL RISE-PROTECTION OF TELECOMMUNICATIONS NETWORK USERS, PERSONNEL AND PLANT...
    4 - PREFACE
    5 - CONTENTS
    7 - SECTION 1 SCOPE AND GENERAL
    7 - 1.1 SCOPE
    7 - 1.2 APPLICATION
    7 - 1.3 REFERENCED DOCUMENTS
    9 - SECTION 2 DEFINITIONS
    9 - 2.1 DEFINITIONS
    9 - 2.1.1 DOG
    9 - 2.1.2 Earth grid voltage rise (EGVR)
    10 - SECTION 3 EPR AND GENERAL
    10 - 3.1 DESCRIPTION OF EPR
    11 - 3.2 SOME EPR HAZARD SITUATIONS TO CONSIDER
    11 - 3.2.1 Telecommunications cables passing through a hazard zone
    12 - 3.2.2 Telecommunications equipment installed inside a building which may have a hazardous EPR on its power earth
    15 - 3.2.3 Voltage hazard relevant to telecommunications network
    15 - 3.3 CONSIDERATION OF POWER UTILITY CONSTRUCTION PROPOSALS
    16 - SECTION 4 EPR HAZARD VOLTAGE LIMITS
    16 - 4.1 INTRODUCTION
    16 - 4.2 RISK OF EPR HAZARD
    17 - 4.3 AUSTRALIAN EPR HAZARD VOLTAGE LIMITS
    17 - 4.4 BASIS OF AUSTRALIAN EPR HAZARD VOLTAGE LIMITS
    18 - 4.5 NEW ZEALAND EPR HAZARD VOLTAGE LIMITS
    19 - 4.6 BASIS OF NEW ZEALAND EPR HAZARD VOLTAGE LIMITS
    20 - SECTION 5 ASSESSMENT OF EPR
    20 - 5.1 EPR ASSESSMENT PROCESS
    21 - 5.2 COMBINED EPR AND LFI EFFECTS
    22 - 5.3 HAZARD CALCULATIONS IN SMALL INSTALLATIONS
    22 - 5.3.1 General
    22 - 5.3.2 EPR calculation
    23 - 5.4 ELECTRODES
    23 - 5.4.1 General
    23 - 5.4.2 Primary electrodes
    24 - 5.5 ESTIMATION OF EARTH FAULT CURRENTS
    24 - 5.6 SURFACE VOLTAGE GRADIENTS
    24 - 5.6.1 Earth resistivity known
    25 - 5.6.2 Uncertainties in earth resistivity
    26 - 5.7 LIMITS FOR APPLYING THE SIMPLIFIED CALCULATIONS
    26 - 5.7.1 General
    26 - 5.7.2 Non-hemispherical earthing systems
    27 - 5.7.3 Multilayer earth resistivity effects
    27 - 5.7.4 Conductors extending the EPR
    28 - 5.8 EPR IN LARGE SUBSTATIONS
    28 - 5.8.1 General
    28 - 5.8.2 EPR calculation
    28 - 5.9 EARTH SYSTEM IMPEDANCE
    28 - 5.9.1 General
    29 - 5.9.2 Aerial conductors
    29 - 5.9.3 Underground cables
    30 - 5.10 DETERMINATION OF PROSPECTIVE FAULT CURRENT (Initial estimate)
    30 - 5.11 COMPUTER ANALYSIS
    33 - SECTION 6 FIELD TESTS AND MEASUREMENTS
    33 - 6.1 INTRODUCTION
    33 - 6.2 OBJECTIVES OF FIELD TESTS
    33 - 6.3 METHODOLOGY
    33 - 6.4 CURRENT INJECTION TESTS
    33 - 6.4.1 General
    34 - 6.4.2 50 Hz high-current injection test
    35 - 6.4.3 Off-frequency high-current injection test
    36 - 6.4.4 Off-frequency low-current injection test
    39 - 6.5 SELECTION OF THE APPROPRIATE INJECTION METHOD
    40 - 6.6 CURRENT SOURCES
    40 - 6.6.1 Maximum value
    40 - 6.6.2 50 Hz high-current source
    41 - 6.6.3 Off-frequency high-current source
    41 - 6.6.4 Off-frequency low-current source
    42 - 6.7 REMOTE CURRENT ELECTRODE
    42 - 6.7.1 Injection earth electrode
    42 - 6.7.2 Potential measurement reference earth electrode
    43 - 6.8 MEASURING GRID IMPEDANCE
    43 - 6.8.1 Small earthing system
    43 - 6.8.2 Tower or conductive pole earth resistance measurement
    44 - 6.8.3 Large earthing system (fall of potential method)
    45 - 6.9 MEASURING SURFACE VOLTAGE GRADIENTS
    49 - 6.10 INTERFERENCE ELIMINATION
    49 - 6.10.1 50 Hz standing voltage
    49 - 6.10.2 Induced voltages
    49 - 6.10.3 D.C. interference
    50 - 6.10.4 Harmonic interferences
    50 - 6.11 INTERPRETATION OF RESULTS
    50 - 6.11.1 Extrapolation to remote earth
    53 - 6.12 CONSIDERATION IN CONJUNCTION WITH LOW FREQUENCY INDUCTION (LFI)
    54 - 6.13 SAFETY PRECAUTIONS
    55 - 6.14 COORDINATION
    55 - 6.14.1 Purposes of coordination
    55 - 6.14.2 Coordination of tests
    55 - 6.15 SOIL RESISTIVITY
    55 - 6.15.1 General
    57 - 6.16 METHODS OF MEASUREMENT (WENNER AND SCHLUMBERGER ARRAYS)
    57 - 6.16.1 Symmetrical line arrays
    58 - 6.16.2 Advantages of Wenner array
    58 - 6.16.3 Advantages of Schlumberger array
    59 - 6.17 RESISTIVITY MEASUREMENT ANALYSIS
    59 - 6.17.1 Earth resistivity interpretation procedure
    60 - 6.18 INTERPRETATION OF RESISTIVITY MEASUREMENT
    61 - 6.19 SOURCES OF ERRORS
    61 - 6.20 EQUIPMENT AND INSTRUMENTATION
    62 - 6.21 CALIBRATION OF EQUIPMENT
    63 - SECTION 7 MITIGATION
    63 - 7.1 INTRODUCTION
    63 - 7.2 SCOPE OF MITIGATION
    63 - 7.3 MITIGATION MEASURES APPLIED TO POWER SYSTEM PLANT
    63 - 7.3.1 General
    64 - 7.3.2 Design options for minimizing EPR problems
    70 - 7.4 LIGHTNING PROTECTION AT TELECOMMUNICATIONS USER™s PREMISES
    71 - 7.5 MITIGATION MEASURES APPLIED TO TELECOMMUNICATIONS PLANT
    71 - 7.5.1 General
    71 - 7.5.2 Telecommunications isolation equipment
    77 - 7.5.3 Installation of isolation equipment
    80 - 7.5.4 Other mitigation measures that may be applied to telecommunications plant
    85 - 7.5.5 Other services entering or leaving a HV site or EPR hazard zone
    85 - 7.5.6 HV and LV monitoring, metering, and control equipment using telecommunications services
    86 - APPENDIX A - TYPICAL HAZARD ZONES
    86 - A1 INTRODUCTION
    86 - A2 SCOPE
    86 - A3 TYPICAL EXTENT OF HAZARD ZONES
    86 - A3.1 For Australia
    86 - A3.2 For New Zealand
    86 - A4 GUIDELINES FOR INTERPRETATION OF THE TYPICAL HAZARD ZONE
    101 - APPENDIX B - EPR DANGER SIGNS-AUSTRALIA ONLY SIGNS FOR HV SITES AND COMMUNICATIONS CABLE PITS/MANHOLES
    101 - B1 SCOPE
    101 - B2 GENERAL
    104 - APPENDIX C - BIBLIOGRAPHY

    Abstract - (Show below) - (Hide below)

    Specifies recommendation and code of practice for the application of the EPR Code of practice for the protection of persons or plant prescribed in AS/NZS3835.1.

    Scope - (Show below) - (Hide below)

    This Standard is a guide to the application of the EPR Code of practice for the protection of persons or plant prescribed in AS/NZS 3835.1. This Standard is intended for personnel responsible for ensuring safety in a telecommunications service environment.

    General Product Information - (Show below) - (Hide below)

    Committee ET-007
    Development Note Standard has been given Pending Revision status.
    Document Type Standard
    Product Note Pending Revision indicates that as a result of the Aged Standards review process, the document needs updating. If no project proposal, meeting the quality criteria, is received within the 12 month timeframe, the document shall be withdrawn.
    Publisher Standards Australia
    Status Current
    Supersedes

    History - (Show below) - (Hide below)

    First published as AS/NZS 3835.2:2006.

    Standards Referenced By This Book - (Show below) - (Hide below)

    AS/NZS 60479.1:2002 Effects of current on human beings and livestock General aspects
    HB 101-1997 (CJC 5) Coordination of power and telecommunications - Low Frequency Induction (LFI) - Code of practice for the mitigation of hazardous voltages induced into telecommunications lines
    AS/NZS 1477:2006 PVC pipes and fittings for pressure applications
    AS/NZS 60950.1:2003 Information technology equipment - Safety General requirements (IEC 60950-1:2001, MOD)
    AS 60529-2004 Degrees of protection provided by enclosures (IP Code) (Reconfirmed 2018)
    AS 1319-1994 Safety signs for the occupational environment (Reconfirmed 2018)
    AS 2225-1994 Insulating gloves for electrical purposes
    AS/NZS 3000:2000 Electrical installations (known as the Australian/New Zealand Wiring Rules)

    Standards Referencing This Book - (Show below) - (Hide below)

    HB 219:2006 Earth potential rise - Protection of telecommunications network users, personnel and plant - Worked examples for the application guide (Reconfirmed 2020)
    AS/NZS 1768:2007 Lightning protection
    AS/NZS 7000:2016 Overhead line design
    HB 331-2012 Overhead line design
    AS 2067-2008 Substations and high voltage installations exceeding 1 kV a.c.
    AS/NZS 3084:2017 Telecommunications installations - Telecommunications pathways and spaces for commercial buildings
    AS/NZS 7000:2010 Overhead line design - Detailed procedures
    AS 2067:2016 Substations and high voltage installations exceeding 1 kV a.c.
    AS/NZS 3835.1:2006 Earth potential rise - Protection of telecommunications network users, personnel and plant Code of practice
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