AS/NZS 3008.1.2:1998
Electrical installations - Selection of cables - Cables for alternating voltages up to and including 0.6/1 kV - Typical New Zealand installation conditions
Sets out the procedures to be followed for the selection of cables to satisfy typical New Zealand installation conditions where the ambient air temperature is 30 degrees C and ambient soil temperature is 15 degrees C. Criteria given are current-carrying capacity, voltage drop and short-circuit temperature rise.
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AS/NZS 3008.1.2:1998 ELECTRICAL INSTALLATIONS - SELECTION OF CABLES - CABLE FOR ALTERNATING VOLTAGES UP TO AND INCLUDING 0.6/1 K
PREFACE
CONTENTS
FOREWORD
SECTION 1 SCOPE AND GENERAL
1.1 SCOPE AND APPLICATION
1.1.1 Scope
1.1.2 Application
1.2 ALTERNATIVE SPECIFICATIONS
1.3 REFERENCED AND RELATED DOCUMENTS
1.3.1 Referenced documents
1.3.2 Related documents
1.4 DEFINITIONS
1.4.1 Ambient temperature
1.4.2 Continuous loading
1.4.3 Ladder support
1.4.4 Perforated tray
1.4.5 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
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 and unsheathed thermoplastic, elastomer and XLPE 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 elastomer, polymeric or fibrous 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
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 PERFORMANC
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
APPENDIX B - RECOMMENDED CIRCUIT CONFIGURATIONS FOR THE INSTALLATION OF SINGLE-CORE CABLES IN PARALLEL
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AS/NZS 3008.1.2:1998 ELECTRICAL INSTALLATIONS - SELECTION OF CABLES - CABLE FOR ALTERNATING VOLTAGES UP TO AND INCLUDING 0.6/1 K
PREFACE
CONTENTS
FOREWORD
SECTION 1 SCOPE AND GENERAL
1.1 SCOPE AND APPLICATION
1.1.1 Scope
1.1.2 Application
1.2 ALTERNATIVE SPECIFICATIONS
1.3 REFERENCED AND RELATED DOCUMENTS
1.3.1 Referenced documents
1.3.2 Related documents
1.4 DEFINITIONS
1.4.1 Ambient temperature
1.4.2 Continuous loading
1.4.3 Ladder support
1.4.4 Perforated tray
1.4.5 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
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 and unsheathed thermoplastic, elastomer and XLPE 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 elastomer, polymeric or fibrous 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
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 PERFORMANC
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
APPENDIX B - RECOMMENDED CIRCUIT CONFIGURATIONS FOR THE INSTALLATION OF SINGLE-CORE CABLES IN PARALLEL
AS/NZS 3008.1.2:1998
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.