AS/NZS 3008.1.2:2017
Electrical installations - Selection of cables - Part 1.2: Cables for alternating voltages up to and including 0.6/1 kV - Typical New Zealand conditions
Specifies current-carrying capacity, voltage drop and short-circuit temperature rise of cables, to provide a method of selection for those types of electric 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. This Standard is applicable to New Zealand installation conditions where the nominal ambient air and soil temperatures are 30°C and 15°C, respectively.
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AS/NZS 3008.1.2:2017 ELECTRICAL INSTALLATIONS-SELECTION OF CABLES - CABLES FOR ALTERNATING VOLTAGES UP TO AND INCLUDING 0...
PREFACE
CONTENTS
SECTION 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
1.5.1 Ambient temperature
1.5.2 Circuit
1.5.3 Continuous loading
1.5.4 Installation wiring
1.5.5 Ladder support
1.5.6 Perforated tray
1.5.7 Route length
SECTION 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)
SECTION 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
3.3.2 Flexible cords and cables
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
3.5.3 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
SECTION 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
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 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 - EXAMPLES OF THE SELECTION OF CABLES TO SATISFY CURRENT-CARRYING CAPACITY, VOLTAGE DROP AND SHORT-CIRCUIT...
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 - LIST OF TABLES
APPENDIX C - EXAMPLES OF THE APPLICATION OF REDUCTION FACTORS FOR HARMONIC CURRENTS
APPENDIX D - RECOMMENDED CIRCUIT CONFIGURATIONS FOR THE INSTALLATION OF SINGLE-CORE CABLES IN PARALLEL
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AS/NZS 3008.1.2:2017 ELECTRICAL INSTALLATIONS-SELECTION OF CABLES - CABLES FOR ALTERNATING VOLTAGES UP TO AND INCLUDING 0...
PREFACE
CONTENTS
SECTION 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
1.5.1 Ambient temperature
1.5.2 Circuit
1.5.3 Continuous loading
1.5.4 Installation wiring
1.5.5 Ladder support
1.5.6 Perforated tray
1.5.7 Route length
SECTION 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)
SECTION 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
3.3.2 Flexible cords and cables
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
3.5.3 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
SECTION 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
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 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 - EXAMPLES OF THE SELECTION OF CABLES TO SATISFY CURRENT-CARRYING CAPACITY, VOLTAGE DROP AND SHORT-CIRCUIT...
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 - LIST OF TABLES
APPENDIX C - EXAMPLES OF THE APPLICATION OF REDUCTION FACTORS FOR HARMONIC CURRENTS
APPENDIX D - RECOMMENDED CIRCUIT CONFIGURATIONS FOR THE INSTALLATION OF SINGLE-CORE CABLES IN PARALLEL
Previous versions
AS/NZS 3008.1.2:2017
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.