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AS/NZS 3008.1.2:1998

AS/NZS 3008.1.2:1998

Superseded

Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

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superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Electrical installations - Selection of cables - Cables for alternating voltages up to and including 0.6/1 kV - Typical New Zealand installation conditions

Available format(s)

Hardcopy , PDF 1 User , PDF 3 Users , PDF 5 Users , PDF 9 Users

Superseded date

30-06-2017

Language(s)

English

Published date

01-01-1998

Publisher

Standards Australia

Preview

1 - AS/NZS 3008.1.2:1998 ELECTRICAL INSTALLATIONS - SELECTION OF CABLES - CABLE FOR ALTERNATING VOLTAGES UP TO AND INCLUDING 0.6/1 K
4 - PREFACE
5 - CONTENTS
10 - FOREWORD
11 - SECTION 1 SCOPE AND GENERAL
11 - 1.1 SCOPE AND APPLICATION
11 - 1.1.1 Scope
11 - 1.1.2 Application
11 - 1.2 ALTERNATIVE SPECIFICATIONS
12 - 1.3 REFERENCED AND RELATED DOCUMENTS
12 - 1.3.1 Referenced documents
12 - 1.3.2 Related documents
13 - 1.4 DEFINITIONS
13 - 1.4.1 Ambient temperature
13 - 1.4.2 Continuous loading
13 - 1.4.3 Ladder support
13 - 1.4.4 Perforated tray
13 - 1.4.5 Route length
14 - SECTION 2 CABLE SELECTION PROCEDURE
14 - 2.1 GENERAL
14 - 2.2 SELECTION PROCESS
14 - 2.3 DETERMINATION OF MINIMUM CABLE SIZE BASED ON CURRENT-CARRYING CAPACITY CONSIDERATIONS
15 - 2.4 DETERMINATION OF MINIMUM CABLE SIZE BASED ON VOLTAGE DROP CONSIDERATIONS
16 - 2.5 DETERMINATION OF MINIMUM CABLE SIZE BASED ON THE SHORT-CIRCUIT TEMPERATURE CONSIDERATIONS
17 - SECTION 3 CURRENT-CARRYING CAPACITY
17 - 3.1 RATINGS
17 - 3.1.1 General
17 - 3.1.2 Basis
17 - 3.2 TYPES OF CONDUCTORS
17 - 3.2.1 Conductor material
17 - 3.2.2 Insulation material operating temperatures
18 - 3.3 TYPES OF CABLE
18 - 3.3.1 Sheathed and unsheathed thermoplastic, elastomer and XLPE cables
18 - 3.3.2 Flexible cords and cables
19 - 3.3.3 Mineral-insulated metal-sheathed (MIMS) cables
19 - 3.3.4 Aerial cables
19 - 3.3.5 Neutral-screened cables
20 - 3.3.6 High temperature elastomer, polymeric or fibrous cables and flexible cords
20 - 3.3.7 Other cable types
20 - 3.4 INSTALLATION CONDITIONS
20 - 3.4.1 General
20 - 3.4.2 Cables installed in air
21 - 3.4.3 Cables installed in thermal insulation
22 - 3.4.4 Cables buried direct in the ground
22 - 3.4.5 Cables installed in underground wiring enclosures
23 - 3.4.6 Variation of installation conditions along cable run
23 - 3.5 EXTERNAL INFLUENCES ON CABLES
23 - 3.5.1 Application of rating factors
23 - 3.5.2 Effect of grouping of cables
25 - 3.5.3 Effect of ambient temperature
26 - 3.5.4 Effect of depth of laying
26 - 3.5.5 Effect of thermal resistivity of soil
26 - 3.5.6 Effect of varying loads
26 - 3.5.7 Effect of thermal insulation
27 - 3.5.8 Effect of direct sunlight
66 - SECTION 4 VOLTAGE DROP
66 - 4.1 GENERAL
66 - 4.2 DETERMINATION OF VOLTAGE DROP FROM MILLIVOLTS PER AMPERE METRE
67 - 4.3 DETERMINATION OF VOLTAGE DROP FROM CIRCUIT IMPEDANCE
67 - 4.3.1 General
67 - 4.3.2 Single-phase, two-wire supply system
68 - 4.3.3 Three-phase, three-wire or four-wire supply system
68 - 4.3.4 Two-phase, three-wire, earthed neutral 120-degree supply system
68 - 4.3.5 Single-phase, three-wire, earthed centre-tapped 180-degree supply system
68 - 4.4 DETERMINATION OF VOLTAGE DROP FROM CABLE OPERATING TEMPERATURE
69 - 4.5 DETERMINATION OF VOLTAGE DROP FROM LOAD POWER FACTOR
70 - 4.6 DETERMINATION OF VOLTAGE DROP IN UNBALANCED MULTIPHASE CIRCUITS
90 - SECTION 5 SHORT-CIRCUIT PERFORMANCE
90 - 5.1 GENERAL
90 - 5.2 FACTORS GOVERNING THE APPLICATION OF THE TEMPERATURE LIMITS
91 - 5.3 CALCULATION OF PERMISSIBLE SHORT-CIRCUIT CURRENTS
91 - 5.4 INFLUENCE OF METHOD OF INSTALLATION
92 - 5.5 MAXIMUM PERMISSIBLE SHORT-CIRCUIT TEMPERATURES
92 - 5.5.1 General
92 - 5.5.2 Insulating materials
92 - 5.5.3 Outer sheath and bedding materials
93 - 5.5.4 Conductor and metallic sheath materials and components
94 - APPENDIX A - EXAMPLES OF THE SELECTION OF CABLES TO SATISFY CURRENT-CARRYING CAPACITY, VOLTAGE DROP AND SHORT-CIRCUIT PERFORMANC
94 - A1 EXAMPLE 1
94 - A1.1 Problem
94 - A1.2 Solution
95 - A1.3 Comparison of different methods
96 - A2 EXAMPLE 2
96 - A2.1 Problem
96 - A2.2 Solution
96 - A3 EXAMPLE 3
96 - A3.1 Problem
96 - A3.2 Solution
97 - A4 EXAMPLE 4
97 - A4.1 Problem
97 - A4.2 Solution
98 - A5 EXAMPLE 5
98 - A5.1 Problem
98 - A5.2 Solution
99 - A6 EXAMPLE 6
99 - A6.1 Problem
99 - A6.2 Solution
100 - A7 EXAMPLE 7
100 - A7.1 Problem
100 - A7.2 Solution
101 - A8 EXAMPLE 8
101 - A8.1 Problem
101 - A8.2 Solution
103 - APPENDIX B - RECOMMENDED CIRCUIT CONFIGURATIONS FOR THE INSTALLATION OF SINGLE-CORE CABLES IN PARALLEL

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 Celsius and ambient soil temperature is 15 degrees Celsius. Criteria given are current-carrying capacity, voltage drop and short-circuit temperature rise.

This Standard sets out a method for cable selection for those types of electrical cables and methods of installation which are in common use at working voltages up to and including 0.6/1 kV at 50 Hz a.c.Three criteria are given for cable selection, as follows:(a) Current-carrying capacity.(b) Voltage drop.(c) Short-circuit temperature rise.This Standard provides sustained current-carrying capacities and voltage drop values for those types of electrical cable and installation practices in common use in New Zealand. A significant amount of explanatory material is also provided on the application of rating factors which arise from the particular installation conditions of a single circuit or groups of circuits. Also, provided in Section 5 is information on cable selection based on short-circuit temperature limits.NOTE: A number of worked examples on cable selection are included in Appendix A.This Standard does not take into account the effects that may occur owing to temperature rise at the terminals of equipment and reference is necessary to NZS 3000 and the individual equipment Standards.ApplicationThis Standard is intended to apply to installations made or carried out after the date of publication, but it is recommended that it not be applied on a mandatory basis until 6 months after the date of publication. However, if work on an installation is commenced before publication of this edition, the inspecting authority may grant permission for the installation to be carried out in accordance with the superseded edition.

Committee
EL-001
DocumentType
Standard
ISBN
0 7337 1902 3
Pages
93
PublisherName
Standards Australia
Status
Superseded
SupersededBy
Supersedes

First published as AS/NZS 3608.1.2:1998.

AS 1531-1991 Conductors - Bare overhead - Aluminium and aluminium alloy (Reconfirmed 2016)
AS/NZS 3198:1996 Approval and test specification - Electric cables - XLPE insulated - For working voltages up to and including 0.6/1 kV
AS 3158-1994 Approval and test specification - Electric cables - Glass fibre insulated for working voltages up to and including 0.6/1 kV
AS/NZS 3191:1996 Approval and test specification - Electric flexible cords
AS 3178-1991 Approval and test specification - Electric cables - Silicone rubber insulated - For working voltages up to and including 0.6/1 kV
AS 3147-1992 Approval and test specification - Electric cables - Thermoplastic insulated - For working voltages up to and including 0.6/1 kV
AS 3560-1991 Electric cables - XLPE insulated - Aerial bundled - For working voltages up to and including 0.6/1 kV
AS 1125-1993 Conductors in insulated electric cables and flexible cords
AS/NZS 3116:1996 Approval and test specification - Electric cables - Elastomer insulated - For working voltages up to and including 0.6/1 kV
AS/NZS 3155:1995 Approval and test specification - Electric cables - Neutral screened - For working voltages up to and including 0.6/1 kV
AS/NZS 3187:1995 Approval and test specification - Mineral-insulated metal-sheathed cables
AS 1746-1991 Conductors - Bare overhead - Hard-drawn copper

AS/NZS 3560.1:2000 Electric cables - Cross-linked polyethylene insulated - Aerial bundled - For working voltages up to and including 0.6/1(1.2) kV Aluminium conductors (Reconfirmed 2021)
AS/NZS 3015:2004 Electrical installations - Extra-low voltage d.c. power supplies and service earthing within public telecommunications networks
AS/NZS 2832.1:1998 Cathodic protection of metals - Pipes and cables
AS/NZS 5000.1:2005 Electric cables - Polymeric insulated For working voltages up to and including 0.6/1 (1.2) kV (Reconfirmed 2017)
AS/NZS 1300:2009 Electrical equipment for mines and quarries - Bolted explosion-protected three-phase cable coupling devices (Reconfirmed 2020)
AS/NZS 3947.3:2001 Low-voltage switchgear and controlgear Switches, disconnectors, switch-disconnectors and fuse-combination units
AS 2832.1-2004 Cathodic protection of metals Pipes and cables
AS/NZS 61535.1(INT):2001 Installation couplers General requirements
AS/NZS 4026:2001 Electric cables - For underground residential distribution systems
AS/NZS 3191:2008 Electric flexible cords (Reconfirmed 2019)
AS/NZS 3003:1999 Electrical installations - Patient treatment areas of hospitals and medical and dental practices
AS/NZS 5033:2005 Installation of photovoltaic (PV) arrays
AS/NZS 3004.2:2008 Electrical installations - Marinas and recreational boats Recreational boats installations
AS/NZS 3003:2003 Electrical installations - Patient treatment areas of hospitals and medical, dental practices and dialyzing locations
AS/NZS 4026:2008 Electric cables - For underground residential distribution systems
AS/NZS 3191:2003 Electric flexible cords
AS/NZS 61535.1:2003 Installation couplers General requirements
AS/NZS 3000:2007 Electrical installations (known as the Australian/New Zealand Wiring Rules)
AS 2067-2008 Substations and high voltage installations exceeding 1 kV a.c.
AS/NZS 3012:2003 Electrical installations - Construction and demolition sites
AS/NZS 3947.3 SUPP 1:2001 Low-voltage switchgear and controlgear Switches, disconnectors, switch-disconnectors and fuse-combination units - Fuse-switch-disconnectors and switch-disconnectors for use with low-voltage aerial bundled cables (Supplement to AS/NZS 3947.3:2001)
AS 2832.2-2003 Cathodic protection of metals Compact buried structures
AS/NZS 3000:2000 Electrical installations (known as the Australian/New Zealand Wiring Rules)
AS/NZS 3008.1.1:2009 Electrical installations - Selection of cables Cables for alternating voltages up to and including 0.6/1 kV - Typical Australian installation conditions
AS/NZS 3560.2:2003 Electric cables - Cross-linked polyethylene insulated - Aerial bundled - For working voltages up to and including 0.6/1 (1.2) kV Copper conductors
AS/NZS 5000.1:2003 Electric cables - Polymeric insulated For working voltages up to and including 0.6/1 (1.2) kV
AS/NZS 1299:2009 Electrical equipment for mines and quarries - Explosion-protected three-phase restrained plugs and receptacles for working voltages up to and including 3.3 kV (Reconfirmed 2020)
AS/NZS 1768(INT):2003 Lightning protection
AS/NZS 3808:2000 Insulating and sheathing materials for electric cables
AS/NZS 3599.1:2003 Electric cables - Aerial bundled - Polymeric insulated - Voltages 6.35/11 (12) kV and 12.7/22 (24) kV Metallic screened (Reconfirmed 2021)
HB 301-2001 Electrical installations - Designing to the Wiring rules

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Hardcopy - English
PDF 1 User - English
PDF 3 Users - English
PDF 5 Users - English
PDF 9 Users - English
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