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AS/NZS 4871.1:2012

[Pending Revision]

Electrical equipment for mines and quarries, Part 1: General requirements

Sets out general requirements for the design, construction and testing of electrical equipment intended for mining and quarrying activities and covers any plant intended to be relocated from time to time in association with mining activities. This includes the types of equipment covered in AS/NZS 4871, Parts 2 to 6. These requirements are in addition to those in AS 60204.1 and AS 60204.11, which cover electrical safety of machinery. This Standard does not apply to handheld equipment.
Published: 07/12/2012
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Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
1 Scope and general
1.1 Scope
1.2 Application
1.3 Service conditions
1.4 Referenced documents
1.5 Definitions
1.6 Existing equipment
2 Common requirements
2.1 General
2.1.1 Risk management
2.1.2 Supply system
2.1.3 System fault levels
2.1.4 Equipment selection
2.1.5 Temperature rating
2.1.6 Assembly
2.1.7 Construction
2.1.8 Arc blast protection
2.2 Enclosure requirements
2.2.1 General
2.2.2 Ingress protection (IP)
2.2.3 Internal segregation
2.2.4 Withdrawable and plug-in equipment
2.2.5 Unused openings and threaded entries
2.2.6 Interlocking
2.2.6.1 General
2.2.6.2 Interlocking methods
2.2.6.3 Electrical interlocking of restrained plugs
2.2.7 Protection against direct and indirect contact
2.3 Components requirements
2.3.1 Creepage and clearance
2.3.2 Switching devices
2.3.2.1 General
2.3.2.2 Isolating switches (disconnectors)
2.3.2.3 Circuit breakers
2.3.2.4 Contactors
2.3.3 Transformers
2.3.3.1 General
2.3.3.2 Power transformers
2.3.3.3 Control transformers
2.3.3.4 Current and instrument transformers
2.3.4 Measuring instruments
2.3.5 Terminals
2.3.6 Cable connection
2.3.7 Motors
2.3.8 Variable speed drives
2.3.9 Resistors
2.3.10 Electronic-based systems
2.3.10.1 General
2.3.10.2 Hardware
2.3.10.3 Isolation of data and communication lines
2.3.10.4 Software
2.3.11 EMC immunity and emission
2.4 Conductors and cabling requirements
2.4.1 Conductor insulation
2.4.2 Protective earthing conductors
2.4.3 Neutral earthing conductor
2.4.4 Power conductors
2.4.5 Control, protection and auxiliary conductors
2.4.6 Internal wiring
2.4.7 Cables
2.5 Connection facilities for earthing and equipotential bonding conductors
2.5.1 General
2.5.2 Cables containing only analog and/or digital signals
2.5.3 Circuits requiring earthing
2.5.3.1 General
2.5.3.2 Visibility of contacts
2.5.3.3 Live line indication
2.6 Protection requirements
2.6.1 General
2.6.2 Earth-protection scheme
2.6.2.1 General
2.6.2.2 Earth-fault current limitation
2.6.2.3 Earth-continuity protection
2.6.2.4 Earth-leakage protection
2.6.2.5 Earth-fault lockout protection
2.6.2.6 Neutral-connected current limitation system integrity protection
2.6.3 Protection devices
2.6.3.1 General
2.6.3.2 Emergency stop devices and associated circuitry
2.6.3.3 Short-circuit protection
2.6.3.4 Overload protection
2.6.3.5 Undervoltage protection
2.6.3.6 Loss of vacuum/frozen contact protection
2.6.3.7 Under/overpressure protection
2.6.3.8 Overtemperature protection
2.6.4 Transformer protection
2.6.5 Motor protection
2.6.6 Control, protection or auxiliary circuits
2.7 Remote control
2.8 Proximity detection
2.9 Thermography
3 Hazardous area requirements
3.1 Scope of section
3.2 Explosion protection
3.3 Aluminium or light metal alloy parts
3.4 Interlocking
3.4.1 General
3.4.2 Electrical interlocking
3.4.3 Pilot protection of restrained receptacles
3.4.4 Earth-fault lockout
3.4.5 Earth continuity and earth-fault lockout protection in hazardous zones
3.5 Enclosures
3.5.1 Stored energy devices other than batteries
3.5.2 Explosion-protected enclosures
3.5.3 High energy arcing faults
3.5.4 Temperature rating
3.6 Motors
3.7 Batteries
3.8 Cable hose
3.9 Machine cables
3.9.1 General
3.9.2 Machine power cables
3.9.3 Machine control cables and extra-low voltage power cables
3.9.4 Intrinsically safe data or fibre optic cables
3.9.5 Fibre optic cable and light sources
3.9.6 Intrinsically safe cables
3.9.7 Intrinsically safe cable parameters
3.9.8 Non-intrinsically safe data and communication cables
3.9.9 Light alloy screening
3.10 Intrinsically safe plugs and sockets
3.11 Intrinsically safe conductors
3.11.1 General
3.11.2 Earthing of intrinsically safe circuits
4 Tests
4.1 General
4.2 Type tests
4.2.1 General
4.2.2 Certificates of type tests
4.2.3 Exemption from re-test
4.3 Routine tests
4.4 Testing of devices and self-contained components incorporated in the assembly
4.5 High voltage tests
5 Marking and labelling
5.1 Equipment marking
5.2 Component marking
5.3 Wiring marking
5.4 Warning labels
5.5 Rating plate
6 Documentation
6.1 Safety file
6.2 Technical maintenance and operational manuals
Appendix A
A1 Relating to the installed electrical system
A2 Electrical equipment requirements
A3 Relating to cables and cable entries
Appendix B
B1 General
B2 Recommended process
B3 Other recommendations
Appendix C
C1 General
C2 Examples
C2.1 Example 1
C2.2 Example 2
C2.3 Example 3
C3 Calculation of prospective touch voltage
Appendix D
Appendix E
Appendix F
Appendix G
G1 Safety file
G2 Proprietory information
Appendix H
H1 Type tests
H1.1 Verification of surface temperature-rise limits
H1.1.1 General
H1.1.2 Arrangement for the assembly
H1.1.3 Temperature-rise test using rated load on all apparatus
H1.1.4 Temperature-rise test using heating resistors with an equivalent power loss
H1.1.5 Measurement of temperatures
H1.1.6 Ambient air/water coolant temperature
H1.1.7 Criteria for acceptance
H1.2 Verification of short-circuit withstand strength
H1.2.1 Circuits of assemblies that are exempted from the verification of the short-circuit withstand strength
H1.2.2 General
H1.2.3 Circuits of assemblies the short-circuit withstand strength of which shall be verified
H1.2.4 Test arrangement
H1.2.5 Short-circuit protective device incorporated
H1.2.6 Short-circuit protective device not incorporated
H1.2.7 Rated short-time withstand current test
H1.2.8 Relationship between peak and r.m.s. values for short-circuit current
H1.2.9 Test conditions and criteria
H1.2.10 Power circuit test method and application
H1.2.10.1 Power circuit—Load
H1.2.10.2 Power circuit—Supply
H1.2.10.3 Specific test required for busbars/interconnecting power cable
H1.2.11 Criteria of acceptance
H1.3 Verification of the effectiveness of the protective earth circuit
H1.3.1 General
H1.3.2 Verification of the effective connection between the exposed conductive parts of the assembly and the protective earth circuit
H1.3.3 Verification of the short-circuit strength of the protective earth circuit by test
H1.3.4 Criteria of acceptance
H1.4 Verification of clearances and creepage distances
H1.5 Lightning impulse test
H2 Routine tests
H2.1 General
H2.2 Inspection of the assembly including inspection of wiring, electrical and mechanical operation test
H2.3 Dielectric and insulation test
H2.3.1 Insulation resistance
H2.3.2 High voltage test
H2.3.2.1 General
H2.3.2.2 Test voltage
H2.3.2.3 Test equipment
H2.3.2.4 Procedure
H2.3.3 Criteria of acceptance
H2.4 Checking of the protective earth circuits
H2.5 Partial discharge test
H2.6 Additional routine tests
Amendment control sheet
Amendment No. 1 (2014)
Cited references in this standard
[Obsolescent]
Electrical equipment for explosive gas atmospheres — Selection, installation and maintenance, Part 1: General requirements
[Current]
Approval and test specification — General requirements for electrical equipment
[Current]
Electrical installations — Selection of cables, Part 1.2: Cables for alternating voltages up to and including 0.6/1 kV — Typical New Zealand conditions
[Current]
Electrical installations — Selection of cables, Part 1.1: Cables for alternating voltages up to and including 0.6/1 kV — Typical Australian installation conditions
[Current]
Electrical installations (known as the Australian/New Zealand Wiring Rules)
Content history
[Superseded]