AS/NZS 3015:2004


Electrical installations — Extra-low voltage d.c. power supplies and service earthing within public telecommunications networks

Provides requirements for telecommunications ELV d.c. power supplies in restricted access locations of premises that are used by licensed public telecommunications carriers in the provision of public telecommunications networks. It also provides the essential requirements for personal safety and safety from fire while maintaining the viability of the public telecommunications network.
Published: 01/01/2004
Pages: 50
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Table of contents
Cited references
Content history
Table of contents
About this publication
1 Scope and general
1.1 Scope
1.2 Application
1.3 Referenced documents
1.4 Definitions
1.5 Alterations, additions and repairs
1.6 Inspection and certification of work
2 Batteries
2.1 General
2.2 Battery arrangement
2.2.1 Location
2.2.2 Battery layout Battery not in a cabinet Battery in a cabinet
2.2.3 Cell arrangement
2.2.4 Barriers
2.2.5 Battery isolation
2.2.6 Overcurrent protection
2.2.7 Earthing of battery cabinets
2.3 Ventilation
2.3.1 Arrangement of ventilation
2.3.2 Rate of ventilation
2.3.3 Charging rate Vented batteries Valve-regulated batteries Boost-charging
2.3.4 Method of ventilation General Natural ventilation
2.3.5 Batteries in enclosures
2.3.6 Battery cabinets within buildings
2.3.7 Boost-charging of vented cells
2.4 Intermediate voltages
2.5 Charging and maintenance
3 Direct current distribution and protection
3.1 General
3.2 Circuit arrangement
3.3 Design requirements
3.4 Insulation resistance
3.5 Overcurrent protection
3.5.1 General
3.5.2 d.c. distribution Primary distribution Secondary d.c. distribution
3.6 Switchgear and controlgear
3.7 Distinguishing colours of conductors
3.7.1 Prohibited colours
3.7.2 Live conductors
3.7.3 Earthing and bonding conductors
3.8 Conductor material
3.9 Minimum size of conductor
3.10 Current-carrying capacity of conductors
3.11 Maximum demand of a circuit
3.12 Distribution voltage drop
3.13 Conductors in parallel
3.14 Joints and terminations
3.15 Mechanical protection and support of conductors
3.15.1 General
3.15.2 Busbars
3.15.3 Cables
3.16 Insulation of conductors
3.16.1 Busbars
3.16.2 Cables General Primary d.c. distribution cables
3.16.3 Distribution conductor segregation
4 Telecommunications service earthing
4.1 General
4.2 Service earthing and bonding
4.2.1 General
4.2.2 Service earthing bar Where required Location Size Identification
4.2.3 Service earthing electrode General Connections Resistance to earth Materials Location
4.3 Earthing and bonding conductors
4.3.1 General
4.3.2 Installation
4.3.3 Resistance
4.3.4 Minimum size
4.3.5 Separation
4.3.6 Particular requirements Main service earthing conductor Arrangement Size Equipotential bonding conductor to protective earth Arrangement Size Service earthing conductor (riser) Arrangement Size Service earthing conductor (distribution) Arrangement Size Convertor cubicle bonding Arrangement Size Lightning bonding protection Arrangement Size Other service earthing conductors Conductors terminating on equipment with LV supply and ELV output
4.4 Cable tray isolation for isolated bonding networks
Appendix A
A.1 General
A.2 Derivation of minimum exhaust ventilation rate
A.3 Sample ventilation rate calculations
Appendix B
Appendix C
C.1 General
C.2 Functions of the service earth
C.3 The earth electrode
C.3.1 General
C.3.2 Resistance of the earth electrode
C.3.3 Calculation of earth electrode resistance
C.3.4 Use of electrodes in parallel
C.3.5 Shared systems-earth
C.4 Electrode materials
C.5 Alternating current considerations
C.6 Electrical hazard
C.7 Earth testing and maintenance of earth systems
C.7.1 Earth testing
C.7.2 Maintenance
C.8 Measurement of soil resistivity, earth electrode resistance and earthing system impedance
C.8.1 Determination of soil resistivity by test
C.8.1.1 Method of derivation
C.8.1.2 Instrumentation — Four-pin testing
C.8.2 Electrode resistance testing — Three-pin method
C.8.2.1 General procedure
C.8.2.2 Test lead considerations
C.8.3 Isolation of surge impedance of an electrode system from other fortuitous earth paths
Cited references in this standard
Approval and test specification — General requirements for electrical equipment
Low-voltage switchgear and controlgear assemblies, Part 2: Particular requirements for busbar trunking systems (busways)
Structural design actions, Part 4: Earthquake actions in Australia
Lightning protection
Installation, maintenance, testing and replacement of secondary batteries in buildings, Part 1: Vented cells
Content history