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AS 3015:2022


Electrical installations — Extra-low voltage power supplies and service earthing within telecommunications networks

Sets out requirements for telecommunications ELV power systems used by all telecommunications carriers in the provision of telecommunications networks; including where carrier owns ELV power supply and restricted access locations. Defines demarcation points between Standards when used in telecommunications infrastructure. Specifies minimum requirements for personal safety. Keywords: Extra-low voltage; ELV; power systems; telecommunications networks; restricted access locations
Published: 11/03/2022
Pages: 110
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 Normative references
1.4 Terms and definitions
1.5 Alterations, additions and repairs
1.5.1 General
1.5.2 Alterations
1.5.3 Repairs
2 General requirements
2.1 Demarcation points between standards
2.1.1 General
2.1.2 Equipment rooms and custom-designed outdoor cabinets and enclosures
2.1.3 Outdoor cabinets and enclosures provided “as an appliance”
2.1.4 Outdoor cabinets and enclosures provided “as an installation”
2.1.5 Cable sizing requirements
2.2 Voltage standards
2.2.1 General
2.2.2 Extra-low voltage work
2.2.3 Low voltage work
2.2.4 Co-location of ELV and LV power in equipment room General Considerations Requirements Low voltage inverters in telecommunications facilities Considerations Requirements Inverters without an LV a.c. bypass feed from the a.c. switchboard Inverters with an LV a.c. bypass feed from an a.c. switchboard
2.2.5 Emergency powering of street enclosures
3 Batteries
3.1 General
3.2 Battery terminology hierarchy
3.3 Battery hazards
3.4 Batteries with integral control electronics
3.5 Battery suitability
3.6 Installation of batteries
3.6.1 Float charge requirement
3.6.2 Cyclic charge requirements
3.7 Battery arrangement
3.7.1 Location
3.7.2 Barriers, shrouding or straps
3.7.3 Battery isolation
3.7.4 Overcurrent protection
3.7.5 Automatic battery disconnect devices
3.7.6 Battery cabling
3.7.7 Intermediate voltages
3.7.8 Mixing battery capacities and technologies
3.7.9 Energy hazard
3.8 Lithium-ion batteries
3.8.1 Chemistry
3.8.2 Battery installation
3.9 Lead-acid batteries
3.9.1 General
3.9.2 Charging and maintenance
3.9.3 Rate of ventilation
3.9.4 Charging rate Vented batteries Valve-regulated batteries Boost-charging
3.9.5 Method of ventilation General Natural ventilation Alarm and monitoring Batteries in enclosures Battery cabinets within buildings Boost-charging of vented cells
3.9.6 Lead-acid battery layout in an equipment room Battery in a freestanding battery rack within an equipment room Battery enclosures within equipment rooms
3.9.7 Cell and monobloc arrangement
4 Direct current power systems
4.1 General
4.2 Circuit arrangement
4.3 Design requirements
4.4 Insulation resistance
4.5 Overcurrent protection
4.5.1 General
4.5.2 DC distribution Primary distribution Secondary d.c. distribution
4.6 Switchgear and controlgear
4.7 Conductors
4.7.1 Prohibited colours of conductors
4.7.2 Conductor colour coding
4.7.3 Earthing and bonding conductors
4.8 Conductor material
4.9 Minimum size of conductor
4.10 Current-carrying capacity of conductors
4.11 Maximum demand rating of an existing circuit
4.12 Distribution voltage drop
4.13 Conductors in parallel
4.14 Joints and terminations
4.15 Mechanical protection and support of conductors
4.15.1 General
4.15.2 Busbars
4.15.3 Cables
4.16 Insulation of conductors
4.16.1 Busbars
4.16.2 Cables General Primary d.c. distribution cables
4.16.3 Distribution conductor segregation
5 Telecommunications service earthing
5.1 General
5.2 Service earthing and bonding
5.2.1 General
5.2.2 Service earth bar — Buildings and shelters Requirements Location Size Identification
5.2.3 Feeder earth bar — Buildings and shelters Requirements Location Size Identification
5.2.4 Service earthing electrode General Typical arrangement Connections Corrosion Resistance to earth measurement Electrical noise Earth enhancing compounds Materials, conductor and earth rod sizes Materials for conductors Materials for earth rods Location
5.2.5 Fence and gate bonding
5.3 Earthing and bonding conductors
5.3.1 General
5.3.2 Installation
5.3.3 Resistance
5.3.4 Minimum size
5.3.5 Separation
5.3.6 Battery cabinet bonding conductors
5.4 Buildings and shelters
5.4.1 Main service earthing conductor Arrangement Size
5.4.2 Equipotential bonding conductor to protective earth Arrangement Size
5.4.3 Service earthing conductors terminating on equipment with LV supply and ELV output Arrangement Size
5.4.4 Service earthing conductor (distribution) Arrangement Size
5.4.5 Service earthing conductor (SPC connector) Arrangement Size
5.4.6 SPC to secondary bonding bar (SBB) wire and rack bonding distributor (RBD) Arrangement Size
5.4.7 Rectifier (ELV d.c. power system rack) cubicle bond and SPC to ELV d.c. positive Arrangement Size
5.5 Lightning protection
5.5.1 General
5.5.2 Arrangement
5.5.3 Size
5.5.4 Surge protective devices
5.6 Outdoor cabinets
5.6.1 Main service earth bonding conductor — Arrangement
5.6.2 Service earth bar Size Identification Location
5.6.3 Equipotential bonding conductor to protective earth bar Arrangement Size Common a.c. and telecommunications service earth
5.6.4 Service earth electrode
5.7 Pole and ground mounted equipment and small cells
5.7.1 Main service earth bonding conductor
5.7.2 Service earth bar
5.7.3 Earth electrode and connections
5.8 Hybrid fibre-coaxial networks
5.9 Rooftop installations
5.9.1 Main service earth bonding conductor
5.9.2 Permitted earth electrode
5.9.3 Service earth bar
5.9.4 Equipotential bonding
5.10 Co-location guidelines
5.11 Indoor earthing topology
5.12 Cable tray isolation for Star-IBN networks — Buildings and shelters
5.12.1 General
5.12.2 Rack based requirements — Cabinets and racks DC-C equipment inside a DC-I-configured rack, cabinet or enclosure DC-I equipment inside a DC-C-configured rack, cabinet or enclosure
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 telecommunications 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 Typical resistivity values for various geological materials
C.4 Alternating currents
C.5 Electrical hazard
C.6 Earth testing and maintenance of earth systems
C.6.1 Earth testing
C.6.2 Maintenance
C.6.3 Measurement of soil resistivity
C.6.3.1 Method of derivation
C.6.3.2 Instrumentation — Four-pin testing
C.6.4 Electrode resistance testing — Three-pin method
C.6.4.1 General procedure
C.6.4.2 Test lead considerations
C.6.4.3 Fall of potential method
C. Test results
C.6.4.4 Method of using dead earth
C.6.4.5 Clamp-on earth testing
C. General
C. Principle of operation
C.6.5 Earth impedance
Appendix D
Appendix E
Appendix F
Cited references in this standard
Electromagnetic compatibility (EMC), Part 4.6: Testing and measurement techniques - Immunity to conducted disturbances, induced by radio-frequency fields
Electromagnetic compatibility (EMC), Part 4.2: Testing and measurement techniques — Electrostatic discharge immunity test
Electromagnetic compatibility (EMC), Part 4.3: Testing and measurement techniques — Radiated, radio-frequency, electromagnetic field immunity test
Electromagnetic compatibility (EMC), Part 4.4: Testing and measurement techniques — Electrical fast transient/burst immunity test
AS/NZS IEC 61000.4.5
Electromagnetic compatibility (EMC), Part 4.5: Testing and measurement techniques—Surge immunity test
Content history
DR AS 3015:2020
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