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  • HB 242-2007

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    High voltage mining equipment for use underground (Reconfirmed 2019)

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

    Language(s):  English

    Published date:  31-12-2007

    Publisher:  Standards Australia

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

    1 - HB 242-2007 HIGH VOLTAGE MINING EQUIPMENT FOR USE UNDERGROUND
    4 - PREFACE
    5 - CONTENTS
    7 - SECTION 1 SCOPE AND GENERAL
    7 - 1.1 PURPOSE
    7 - 1.2 SCOPE
    7 - 1.3 REFERENCED STANDARDS
    8 - 1.4 DEFINITIONS
    8 - 1.4.1 Active (or active conductor)
    8 - 1.4.2 Area, hazardous
    8 - 1.4.3 Area, non-hazardous (safe)
    8 - 1.4.4 Authorised person
    8 - 1.4.5 Barrier (screen)
    8 - 1.4.6 Circuit-breaker
    9 - 1.4.7 Circuit interrupting device
    9 - 1.4.8 Clearance
    9 - 1.4.9 Competent person
    9 - 1.4.10 Continuous rating
    9 - 1.4.11 Creepage distance
    9 - 1.4.12 Current, overload
    9 - 1.4.13 Current, short-circuit
    9 - 1.4.14 Direct contact
    9 - 1.4.15 Disconnect switch
    9 - 1.4.16 Earth continuity protection system
    9 - 1.4.17 Earth/static discharging stick
    9 - 1.4.18 Earth fault current
    9 - 1.4.19 Earth-fault current limitation
    10 - 1.4.20 Earth-fault protection
    10 - 1.4.21 Earthable point
    10 - 1.4.22 Earthed
    10 - 1.4.23 Electrical equipment
    10 - 1.4.24 Electrical installation
    10 - 1.4.25 Enclosure
    10 - 1.4.26 Equipotential bonding
    10 - 1.4.27 Examination
    10 - 1.4.28 Fault current
    10 - 1.4.29 Feeder cable
    10 - 1.4.30 High voltage
    10 - 1.4.31 Indirect contact
    10 - 1.4.32 Instructed persons
    11 - 1.4.33 Insulated
    11 - 1.4.34 International protection (IP) classification
    11 - 1.4.35 Leakage current (in an installation)
    11 - 1.4.36 Lockout earth-fault protection
    11 - 1.4.37 Maintenance
    11 - 1.4.38 Mobile machine
    11 - 1.4.39 Neutral conductor (symbol N)
    11 - 1.4.40 Ordinary persons
    11 - 1.4.41 Plant
    11 - 1.4.42 Portable equipment
    11 - 1.4.43 Prospective touch voltage
    12 - 1.4.44 Protection device
    12 - 1.4.45 Protective earthing conductor
    12 - 1.4.46 Reeling and trailing cable
    12 - 1.4.47 Restrained plug and receptacle
    12 - 1.4.48 Safe work method statement
    12 - 1.4.49 Shunt release
    12 - 1.4.50 Skilled persons
    12 - 1.4.51 Substation
    12 - 1.4.52 Switchgear
    12 - 1.4.53 Transportable equipment
    12 - 1.4.54 Undervoltage release
    13 - 1.4.55 Working earths
    13 - 1.5 APPLICABLE LEGISLATION
    14 - SECTION 2 HAZARD IDENTIFICATION AND RISK ASSESSMENT
    14 - 2.1 HAZARD ASSESSMENT
    14 - 2.2 CONSULTATION
    15 - SECTION 3 HV SAFETY MANAGEMENT PLAN
    15 - 3.1 GENERAL
    15 - 3.2 ELEMENTS
    16 - SECTION 4 ELECTRICAL PROTECTION
    16 - 4.1 STRATEGY
    16 - 4.2 SECTIONALISING THE DISTRIBUTION SYSTEM
    17 - 4.3 EARTH-CONTINUITY PROTECTION
    17 - 4.4 EARTH-FAULT LIMITATION
    21 - 4.5 EARTH-LEAKAGE PROTECTION
    21 - 4.6 SHORT CIRCUIT
    21 - 4.7 OVERCURRENT/OVERLOAD PROTECTION
    21 - 4.7.1 Overcurrent protection
    21 - 4.7.2 Overload protection
    22 - 4.7.3 Current transformer (CT) considerations
    22 - 4.8 EARTH-FAULT LOCKOUT
    22 - 4.9 RESETS
    22 - 4.10 MAINTENANCE AND TESTING OF PROTECTION DEVICES
    23 - SECTION 5 HIGH VOLTAGE ISOLATION
    23 - 5.1 ISOLATION AND SWITCHING DEVICES
    23 - 5.1.1 General recommendations
    23 - 5.1.2 Isolation devices for electrical work
    24 - 5.1.3 Isolation for mechanical maintenance of equipment
    25 - 5.1.4 Devices for emergency stopping
    26 - 5.1.5 Devices for functional (control) switching
    26 - 5.2 ISOLATION PRACTICES FOR ELECTRICAL WORK
    26 - 5.2.1 Training and competency
    26 - 5.2.2 HV access procedures-lockout and tagging
    26 - 5.2.3 Operator protection
    27 - 5.2.4 Environment for operating HV switch gear
    27 - 5.2.5 Work crew protection
    28 - SECTION 6 ENCLOSURES
    28 - 6.1 ARC FAULT CONTAINMENT
    28 - 6.1.1 Flameproof equipment
    29 - 6.1.2 IP enclosures
    29 - 6.2 CREEPAGE AND CLEARANCE
    30 - 6.3 MINIMUM FREE DISTANCE
    30 - 6.4 PERMITTED TECHNIQUES
    30 - 6.5 IP CONSIDERATIONS
    31 - SECTION 7 DISTRIBUTION AND CONTROL ARRANGEMENTS
    31 - 7.1 GENERAL
    31 - 7.2 MAIN DISCONNECTING SWITCH
    31 - 7.3 TRAILING CABLE DISCONNECTING SWITCHES
    31 - 7.4 DISCONNECTING SWITCHES
    31 - 7.4.1 Rating
    32 - 7.4.2 Visible break
    32 - 7.4.3 Working earths
    33 - 7.4.4 Provision for locking
    33 - 7.4.5 Labelling
    33 - 7.5 BARRIERS AND COVERS
    33 - 7.6 COVER INTERLOCKS
    33 - 7.7 EMERGENCY°STOP SWITCH
    33 - 7.8 CAUTION LABELS
    34 - SECTION 8 RETICULATION
    34 - 8.1 INSTALLATION AND SAFEGUARDING OF CABLES
    34 - 8.1.1 General
    34 - 8.1.2 Feeder cables
    35 - 8.1.3 Ring mains and parallel feeds
    35 - 8.1.4 Multiple feeds
    35 - 8.1.5 Trailing cables
    37 - 8.1.6 Temporary storage of trailing cables
    37 - 8.1.7 Safeguarding of cables
    37 - 8.2 TRAILING CABLE HANDLING AND PULLING
    37 - 8.2.1 Handling
    37 - 8.2.2 Pulling
    38 - 8.2.3 HV testing
    40 - 8.2.4 Repair of cables
    41 - SECTION 9 MOBILE MACHINES AND MOTORS
    41 - 9.1 GENERAL
    41 - 9.2 ELECTRICAL ENCLOSURES
    41 - 9.3 MACHINE SWITCHING DEVICES
    41 - 9.4 BARRIERS
    41 - 9.5 ELECTRICAL INTERLOCKING
    41 - 9.6 EMERGENCY SWITCHING
    42 - 9.7 HV MACHINE CABLES
    42 - 9.8 CABLE ANCHOR POINT
    42 - 9.9 EARTHING
    42 - 9.10 VARIABLE SPEED DRIVES (VSD)
    42 - 9.10.1 General
    42 - 9.10.2 Problems
    43 - 9.10.3 Issues
    43 - 9.10.4 Other considerations
    44 - SECTION 10 TRANSPORTING HIGH VOLTAGE EQUIPMENT
    44 - 10.1 GENERAL
    44 - 10.2 CABLES
    44 - 10.2.1 General
    44 - 10.2.2 Paper insulated lead sheathed steel wire armoured (PILSSWA) cables
    44 - 10.2.3 XLPE
    44 - 10.2.4 Rubber cables to AS/NZS 1802
    44 - 10.2.5 Installations, recovery and storage
    48 - 10.3 OTHER HIGH VOLTAGE EQUIPMENT
    49 - SECTION 11 COMMISSIONING PROCEDURES
    49 - 11.1 GENERAL
    49 - 11.2 FIRST TIME COMMISSIONING
    49 - 11.3 RECOMMISSION/DECOMMISSION
    51 - SECTION 12 OPERATING PROCEDURES SWITCHGEAR/EQUIPMENT
    51 - 12.1 OPERATING PROCEDURES FOR OPERATORS OF HV MACHINES
    52 - 12.2 OPERATING PROCEDURES FOR ELECTRICAL MAINTENANCE AND/OR REPAIR OF HV EQUIPMENT
    54 - SECTION 13 INSPECTION AND MAINTENANCE
    54 - 13.1 TROUBLESHOOTING AND TESTING
    54 - 13.1.1 General
    54 - 13.1.2 Trailing cable and mining machine electrical work procedures
    55 - 13.1.3 Trailing cable troubleshooting and testing
    55 - 13.1.4 DCB electrical work procedures
    56 - 13.1.5 HV access procedures - lockout and tagging
    56 - 13.2 MAINTENANCE OF HV SYSTEMS
    56 - 13.2.1 General
    56 - 13.2.2 Safety
    57 - 13.2.3 Items to be considered
    57 - 13.2.4 Trailing cable inspections
    57 - 13.2.5 Maintenance on HV switchgear
    57 - 13.2.6 Special considerations for SF6 switchgear
    59 - APPENDIX A - TOUCH POTENTIAL CALCULATIONS FOR A HIGH VOLTAGE AFC
    59 - A1 FACTORS AFFECTING TOUCH POTENTIAL
    59 - A2 EXAMPLE
    59 - A3 CALCULATION
    61 - A4 CALCULATION FOR A BROADER RANGE OF VALUES
    65 - APPENDIX B - PLANT STANDARDS
    66 - APPENDIX C - USEFUL PUBLICATIONS
    66 - C1 DESIGN & TESTING
    66 - C2 APPLICATION
    68 - APPENDIX D - EXAMPLES OF SAFETY ALERTS INVOLVING HV EQUIPMENT

    Abstract - (Show below) - (Hide below)

    This Handbook outlines safety guidelines for electrical mining equipment where the voltage of the supply system is above 1200 V and covers non-hazardous and hazardous area applications. It contains provisions relating to equipment design, commissioning, operation, and maintenance of such equipment. This Handbook should be read in conjunction with the joint Australian and New Zealand Standard AS/NZS 4871.

    Scope - (Show below) - (Hide below)

    This Handbook outlines safety guidelines for electrical mining equipment where the voltage of the supply system is above 1200 V and covers non-hazardous and hazardous area applications. It contains provisions relating to equipment design, commissioning, operation, and maintenance of such equipment. This Handbook should be read in conjunction with the joint Australian and New Zealand Standard AS/NZS 4871. Recommendations for plant Standards are contained in Appendix B, while useful publications are noted in Appendix C. Appendix D provides examples of safety alerts involving HV equipment.

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

    Committee EL-023
    Document Type Handbook
    Product Note Reconfirmation Notice 01/02/2019 Reconfirmed 01/02/2019.
    This standard has been reconfirmed in Australia in 2019 and remains current in New Zealand.
    Publisher Standards Australia
    Status Current

    History - (Show below) - (Hide below)

    First published as HB 242-2007.
    Reconfirmed 2019. First published as HB 242-2007.

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

    AS/NZS 4871.4:2002 Electrical equipment for coal mines, for use underground Mains powered electrical mobile machines
    AS/NZS 60479.1:2002 Effects of current on human beings and livestock General aspects
    AS/NZS 60112:2003 Method for the determination of the proof and the comparative tracking indices of solid insulating materials
    AS/NZS 4871.2:2002 Electrical equipment for coal mines, for use underground Distribution, control and auxiliary equipment
    AS 60529-2004 Degrees of protection provided by enclosures (IP Code) (Reconfirmed 2018)
    AS/NZS 3000:2007 Electrical installations (known as the Australian/New Zealand Wiring Rules)
    AS/NZS 4024.1:2006 Series Safety of machinery Safety of machinery series
    AS/NZS 1747:2003 Reeling, trailing and feeder cables used for mining - Repair, testing and fitting of accessories (Reconfirmed 2020)
    AS/NZS 2081.1:2002 Electrical equipment for coal and shale mines - Electrical protection devices - General requirements
    AS 3007.2-2004 Electrical installations - Surface mines and associated processing plant - General protection requirements
    AS/NZS 60079.7:2006 Explosive atmospheres Equipment protection by increased safety 'e'
    AS/NZS 2081.5:2002 Electrical equipment for coal and shale mines - Electrical protection devices - Earth-fault current limiters
    AS/NZS 2081.4:2002 Electrical equipment for coal and shale mines - Electrical protection devices - Lockout earth-fault protection devices
    AS 60204.1-2005 Safety of machinery - Electrical equipment of machines General requirements (IEC 60204-1, Ed. 5 (FDIS) MOD)
    AS/NZS 4871.3:2002 Electrical equipment for coal mines, for use underground Substations
    AS/NZS 4360:2004 Risk management
    AS/NZS 4871.1:2002 Electrical equipment for coal mines, for use underground General requirements
    AS/NZS 2081.2:2002 Electrical equipment for coal and shale mines - Electrical protection devices - Earth-continuity monitoring devices
    AS/NZS 2081.3:2002 Electrical equipment for coal and shale mines - Electrical protection devices - Earth-leakage protection systems for use on earth-fault current limited systems (IT systems)
    AS/NZS 4801:2001 Occupational health and safety management systems - Specification with guidance for use
    AS/NZS 4871.6:2007 Electrical equipment for coal mines, for use underground Diesel powered machinery and ancillary equipment
    AS/NZS 4871.5:2002 Electrical equipment for coal mines, for use underground Battery powered electrical mobile machines
    AS/NZS 2290.1:2005 Electrical equipment for coal mines - Introduction and maintenance - For hazardous areas
    AS/NZS 1802:2003 Electric cables - Reeling and trailing - For underground coal mining purposes

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

    SA/SNZ HB 146:2018 Management of electrical cable in mines and quarries
    AS/NZS 2290.1:2014 Electrical equipment for coal mines - Introduction, inspection and maintenance For hazardous areas
    AS 2067-2008 Substations and high voltage installations exceeding 1 kV a.c.
    AS 2067:2016 Substations and high voltage installations exceeding 1 kV a.c.
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