Standard
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AS/NZS 3008.1.2:2017
[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
This Standard sets out a method for cable selection for those types of electrical cables and methods of installation that are in common use at working voltages up to and including 0.6/1 kV at 50 Hz a.c.
Published: 02/02/2017
Pages: 140
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
1 Scope and application
1.1 Scope
1.2 Application
1.3 Alternative specifications
1.4 Referenced and related documents
1.4.1 Referenced documents
1.4.2 Related documents
1.5 Definitions
2 Cable selection procedure
2.1 General
2.2 Selection process
2.3 Determination of minimum cable size based on current-carrying capacity considerations
2.4 Determination of minimum cable size based on voltage drop considerations
2.5 Determination of minimum cable size based on the short-circuit temperature considerations
2.6 Determination of cable size based on the economic optimization considerations (optional)
3 Current-carrying capacity
3.1 Ratings
3.1.1 General
3.1.2 Basis
3.2 Types of conductors
3.2.1 Conductor material
3.2.2 Insulation material operating temperatures
3.3 Types of cable
3.3.1 Sheathed or unsheathed thermoplastic, cross-linked elastomeric and XLPE insulated cables
3.3.1.1 General
3.3.1.2 Method of installation
3.3.2 Flexible cords and cables
3.3.2.1 Used for installation wiring
3.3.2.2 Other than installation wiring
3.3.3 Mineral-insulated metal-sheathed (MIMS) cables
3.3.4 Aerial cables
3.3.5 Neutral-screened cables
3.3.6 High temperature cross-linked elastomeric, polymeric or fibrous insulated cables and flexible cords
3.3.7 Other cable types
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 the 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 rating factors
3.5.2 Effect of grouping of cables
3.5.2.1 General
3.5.2.2 Installation conditions that avoid derating
3.5.2.3 Cables run horizontally
3.5.2.4 Cables run vertically
3.5.2.5 Cables buried direct in the ground
3.5.2.6 Cables in wiring enclosures
3.5.2.7 Conductors connected in parallel or passing more than once within a group or enclosure
3.5.2.8 Cables on drums or reels
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
3.5.10 Effect of parallel cables
3.5.11 Effect of electromagnetic interference
4 Voltage drop
4.1 General
4.2 Determination of voltage drop from millivolts per ampere metre
4.3 Determination of voltage drop from circuit impedance
4.3.1 General
4.3.2 Single-phase, two-wire supply system
4.3.3 Three-phase, three-wire or four-wire supply system
4.3.4 Two-phase, three-wire, earthed neutral 120-degree supply system
4.3.5 Single-phase, three-wire, earthed centre-tapped 180-degree supply system
4.4 Determination of voltage drop from cable operating temperature
4.5 Determination of voltage drop from load power factor
4.6 Determination of voltage drop in unbalanced multiphase circuits
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 temperatures
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
Appendix A
A1 Example 1
A1.1 Problem
A1.2 Solution
A1.3 Comparison of different methods
A2 Example 2
A2.1 Problem
A2.2 Solution
A3 Example 3
A3.1 Problem
A3.2 Solution
A4 Example 4
A4.1 Problem
A4.2 Solution
A5 Example 5
A5.1 Problem
A5.2 Solution
A6 Example 6
A6.1 Problem
A6.2 Solution
A7 Example 7
A7.1 Problem
A7.2 Solution
A8 Example 8
A8.1 Problem
A8.2 Solution
A9 Example 9
A9.1 Economic cable sizing
A9.2 Problem
A9.3 Solution
Appendix B
Appendix C
Appendix D
Cited references in this standard
[Withdrawn]
Mineral insulated cables and their terminations with a rated voltage not exceeding 750 V, Part 1: Cables
[Current]
Electric cables — Polymeric insulated, Part 2: For working voltages up to and including 450/750 V
[Current]
Electric cables - Polymeric insulated, Part 1: For working voltages up to and including 0.6/1 (1.2) kV
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