Standard
Track updates
AS 3015:2022
[Current]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
Header
About this publication
Preface
Introduction
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
2.2.4.1 General
2.2.4.1.1 Considerations
2.2.4.1.2 Requirements
2.2.4.2 Low voltage inverters in telecommunications facilities
2.2.4.2.1 Considerations
2.2.4.2.2 Requirements
2.2.4.3 Inverters without an LV a.c. bypass feed from the a.c. switchboard
2.2.4.4 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
3.9.4.1 Vented batteries
3.9.4.2 Valve-regulated batteries
3.9.4.3 Boost-charging
3.9.5 Method of ventilation
3.9.5.1 General
3.9.5.2 Natural ventilation
3.9.5.3 Alarm and monitoring
3.9.5.4 Batteries in enclosures
3.9.5.5 Battery cabinets within buildings
3.9.5.6 Boost-charging of vented cells
3.9.6 Lead-acid battery layout in an equipment room
3.9.6.1 Battery in a freestanding battery rack within an equipment room
3.9.6.2 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
4.5.2.1 Primary distribution
4.5.2.2 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
4.16.2.1 General
4.16.2.2 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
5.2.2.1 Requirements
5.2.2.2 Location
5.2.2.3 Size
5.2.2.4 Identification
5.2.3 Feeder earth bar — Buildings and shelters
5.2.3.1 Requirements
5.2.3.2 Location
5.2.3.3 Size
5.2.3.4 Identification
5.2.4 Service earthing electrode
5.2.4.1 General
5.2.4.2 Typical arrangement
5.2.4.3 Connections
5.2.4.4 Corrosion
5.2.4.5 Resistance to earth measurement
5.2.4.6 Electrical noise
5.2.4.7 Earth enhancing compounds
5.2.4.8 Materials, conductor and earth rod sizes
5.2.4.8.1 Materials for conductors
5.2.4.8.2 Materials for earth rods
5.2.4.9 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
5.4.1.1 Arrangement
5.4.1.2 Size
5.4.2 Equipotential bonding conductor to protective earth
5.4.2.1 Arrangement
5.4.2.2 Size
5.4.3 Service earthing conductors terminating on equipment with LV supply and ELV output
5.4.3.1 Arrangement
5.4.3.2 Size
5.4.4 Service earthing conductor (distribution)
5.4.4.1 Arrangement
5.4.4.2 Size
5.4.5 Service earthing conductor (SPC connector)
5.4.5.1 Arrangement
5.4.5.2 Size
5.4.6 SPC to secondary bonding bar (SBB) wire and rack bonding distributor (RBD)
5.4.6.1 Arrangement
5.4.6.2 Size
5.4.7 Rectifier (ELV d.c. power system rack) cubicle bond and SPC to ELV d.c. positive
5.4.7.1 Arrangement
5.4.7.2 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
5.6.2.1 Size
5.6.2.2 Identification
5.6.2.3 Location
5.6.3 Equipotential bonding conductor to protective earth bar
5.6.3.1 Arrangement
5.6.3.2 Size
5.6.3.3 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
5.12.2.1 DC-C equipment inside a DC-I-configured rack, cabinet or enclosure
5.12.2.2 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.6.4.3.1 Test results
C.6.4.4 Method of using dead earth
C.6.4.5 Clamp-on earth testing
C.6.4.5.1 General
C.6.4.5.2 Principle of operation
C.6.5 Earth impedance
Appendix D
Appendix E
Appendix F
Bibliography
Cited references in this standard