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AS/NZS 3008.1.1:2025
[Current]Electrical installations - Selection of cables, Part 1.1: Cables for voltages up to and including 0.6/1 kV a.c. and up to and including 1500 V d.c. - Typical Australian installation conditions
AS/NZS 3008.1.1:2025 provides standardized current carrying capacity voltage drop and short-circuit temperature rise of cables and the correction factors for those standardized values. It also provides a method of selection for those types of electric cables in a range of optional installation conditions that are in common use at working voltages up to and including 0.6/1 kV at 50 Hz a.c. and 1 500 V d.c.
Published: 19/12/2025
Pages: 178
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
1 Scope and general
1.1 Scope
1.2 Normative references
1.3 Terms and definitions
1.4 Alternative specifications
2 Cable selection
2.1 General
2.2 Selection criteria
2.3 Selection procedures
2.3.1 Minimum conductor size based on current carrying capacity
2.3.2 Minimum conductor size based on voltage drop
2.3.3 Minimum conductor size based on short-circuit temperatures
2.3.4 Conductor size based on economic optimization
3 Current carrying capacity
3.1 Ratings
3.1.1 General
3.1.2 Basis
3.1.3 Conductor material
3.2 Insulation material operating temperatures
3.3 Types of cables
3.3.1 Thermoplastic, cross-linked elastomeric and XLPE insulated cables
3.3.1.1 General
3.3.1.2 Method of installation
3.3.1.3 Thermoplastic insulated cables
3.3.2 Flexible cords and flexible cables
3.3.2.1 General
3.3.2.2 Used for installation wiring
3.3.2.3 Used other than for installation wiring
3.3.3 Mineral-insulated metal-sheathed cables
3.3.4 Aerial cables
3.3.5 Neutral-screened cables (including aerial neutral-screened cables)
3.3.6 High-temperature cross-linked elastomeric, polymeric or fibrous insulated cables and flexible cords
3.4 Installation conditions
3.4.1 General
3.4.2 Cables installed in air
3.4.3 Cables installed in thermal insulation
3.4.4 Cables buried direct in ground
3.4.5 Cables installed in underground wiring enclosures
3.4.6 Variation of installation conditions along cable run
3.5 External influences on cables
3.5.1 Application of correction factors
3.5.2 Effect of grouping of cables
3.5.2.1 General
3.5.2.2 Installation conditions that avoid correction
3.5.2.3 Positioning of neutral conductors
3.5.2.4 Cables run horizontally
3.5.2.5 Cables run vertically
3.5.2.6 Cables buried direct in ground
3.5.2.7 Cables in wiring enclosures
3.5.2.8 Conductors connected in parallel or passing more than once within a group or enclosure
3.5.2.9 Cables installed or stored in a manner that causes self-heating
3.5.2.9.1 Cables on drums or reels
3.5.2.9.2 Cables stored in coils on the ground or on pallets
3.5.3 Effect of ambient temperature
3.5.4 Effect of depth of laying
3.5.5 Effect of thermal resistivity of soil
3.5.6 Effect of varying loads
3.5.7 Effect of thermal insulation
3.5.8 Effect of direct sunlight
3.5.9 Effect of harmonic currents on balanced three-phase systems a.c. systems
3.5.10 Effect of parallel cables
3.5.11 Effect of electromagnetic interference
3.5.12 Installation methods
3.5.13 A.C. circuits including loaded neutral conductor
3.6 Supporting tables for this section
4 Voltage drop and voltage rise
4.1 General
4.1.1 Voltage Drop
4.1.2 Voltage rise
4.1.3 Direct current applications
4.2 Voltage drop from millivolts per ampere metre (a.c.)
4.3 Voltage drop from circuit impedance (a.c.)
4.3.1 General
4.3.2 Single-phase a.c. two-wire supply system
4.3.3 Three-phase a.c., three-wire or four-wire supply system
4.3.4 Two-phase a.c., three-wire, earthed neutral 120° supply system
4.3.5 Single-phase a.c., three-wire, earthed centre-tapped 180° supply system
4.4 Voltage drop from cable operating temperature
4.5 Voltage drop from load power factor (a.c.)
4.6 Voltage drop in unbalanced multiphase a.c. circuits
4.7 Voltage drop from millivolts per ampere metre (d.c.)
4.8 Supporting tables for this section
5 Short-circuit performance
5.1 General
5.2 Factors governing the application of the temperature limits
5.3 Calculation of permissible short-circuit currents
5.4 Influence of method of installation
5.5 Maximum permissible short-circuit currents
5.5.1 General
5.5.2 Insulating materials
5.5.3 Outer sheath and bedding materials
5.5.4 Conductor and metallic sheath materials and components
5.5.5 Tabulated values of maximum permissible short-circuit currents
5.6 Supporting tables for this section
Appendix A
A.1 Continuous current carrying capacity of parallel circuits
A.1.1 Problem
A.1.2 Solution
A.1.3 Comparison of different methods
A.2 Correction factor for multiple cables in a wiring enclosure
A.2.1 Problem
A.2.2 Solution
A.3 Minimum conductor size of cables connected in parallel
A.3.1 Problem
A.3.2 Solution
A.4 Minimum conductor size of cables over a range of lengths
A.4.1 Problem
A.4.2 Solution
A.5 Minimum conductor size of flat cables for a range of continuous loads and installation types
A.5.1 Problem
A.5.2 Solution
A.6 Voltage drop of cables in non-standard ambient air temperature
A.6.1 Problem
A.6.2 Solution
A.7 Voltage drop of cables carrying unbalanced three-phase load
A.7.1 Problem
A.7.2 Solution
A.8 Minimum conductor size and maximum route length for d.c.
A.8.1 Problem
A.8.2 Solution
A.9 Minimum conductor size for short-circuit load
A.9.1 Problem
A.9.2 Solution
A.10 Selection of optimum conductor sizes to satisfy economic considerations
A.10.1 Economic cable sizing
A.10.2 Problem
A.10.3 Solution
A.11 Minimum conductor size to satisfy voltage rise considerations example 1
A.11.1 Problem
A.11.2 Solution
A.12 Minimum conductor size to satisfy voltage rise considerations example 2
A.12.1 Problem
A.12.2 Solution
Appendix B
Appendix C
Bibliography
Cited references in this standard
[Current]
Electrical installations (known as the Australian/New Zealand Wiring Rules)
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