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As NZS 3008.1.2-2010 Electrical Installations - Selection of Cables Cables for Alternating Voltages Up to And | Cable | Electrical Wiring
As NZS 3008.1.2-2010 Electrical Installations - Selection of Cables Cables for Alternating Voltages Up to AndUploaded by SAI Global - APACRelated InterestsCableElectrical WiringElectrical ConductorInsulator (Electricity)Alternating CurrentRating and Stats0.0 (0)Document ActionsDownloadShare or Embed DocumentEmbedDescription: Standards Preview PDFs from SAI Global InfoStoreView MoreStandards Preview PDFs from SAI Global InfoStoreCopyright: Attribution Non-Commercial (BY-NC)Download as PDF, TXT or read online from ScribdFlag for inappropriate contentAS/NZS 3008.1.2:2010
Electrical installations—Selection of cables Part 1.2: Cables for alternating voltages up to and including 0.6/1 kV—Typical New Zealand conditions
AS/NZS 3008.1.2:2010 This Joint Australian/New Zealand Standard was prepared by Joint Technical Committee EL-001, Wiring Rules. It was approved on behalf of the Council of Standards Australia on 22 March 2010 and on behalf of the Council of Standards New Zealand on 29 March 2010. This Standard was published on 22 April 2010.
The following are represented on Committee EL-001: Association of Consulting Engineers Australia Australian Building Codes Board Australian Industry Group Communications, Electrical and Plumbing Union Consumers’ Federation of Australia Electrical and Communications Association (Qld) Electrical Contractors Association of New Zealand Electrical Regulatory Authorities Council Electrical Safety Organisation (New Zealand) ElectroComms & Energy Utilities Industries Skills Council Energy Networks Australia Institute of Electrical Inspectors Ministry of Economic Development (New Zealand) National Electrical and Communications Association New Zealand Council of Elders New Zealand Electrical Institute Telstra Corporation Limited
This Standard was issued in draft form for comment as DR 09928.
Originated in Australia as AS 3008.1—1984. Second edition 1989. Jointly revised and redesignated AS/NZS 3008.1.2:1998. Fourth edition 2010.
ISBN 978-1-86975-128-9
This Standard was prepared by the Joint Standards Australia / Standards New Zealand Committee EL-001, Wiring Rules, to supersede AS/NZS 3008.1.2:1998, Electrical installations—Selection of cables, Part 1.2 Cables for alternating voltages up to and including 0.6/1 kV—Typical New Zealand installation conditions. This Standard is applicable to New Zealand installation conditions where the nominal ambient air and soil temperatures are 30°C and 15°C, respectively. Part 1.1 is applicable to Australian installation conditions where the nominal air and soil temperatures are 40°C and 25°C respectively. Each Part is a complete Standard and requires no reference to the other. Part 2 will deal with cables for use with alternating voltages over 1 kV.
The objective of the Standard is to specify 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 differs from the 1998 edition as follows: (a) (b) (c) The limitations of the installation of thermoplastic insulated cables have been further clarified. An explanation has been provided regarding the properties of cross-linked materials at higher temperatures. Information has been included on the effect of harmonic currents on balanced three-phase systems, the effect of parallel cables and the effect of electromagnetic interference. Ratings for cables with flexible conductors and cables exposed to the sun have been extended in the tables of current-carrying capacities. Thermoplastic insulated cables with temperature ratings of 90°C and 105°C have been included in the tables covering current-carrying capacities of cables with 90°C rated cross-linked insulation materials. For cables with conductor sizes up to 10 mm2 the values of current-carrying capacities for installation in underground wiring enclosures have also been used for the situation of installations ‘buried direct’. Current-carrying capacities for cables installed in wiring enclosures have been recalculated according to IEC 60287. The values for all current-carrying capacities have been expressed to the nearest ampere to align with current IEC practice. Additional values for a.c. resistance and three-phase voltage drop have been included for single-core aerial cables with bare or insulated conductors operating at a conductor temperature of 80°C. Table headings have been simplified and now listed in an Appendix for ease of reference.
In the preparation of this Standard, reference was made to IEC 60287 and acknowledgment is made of the assistance received from that source. Statements expressed in mandatory terms in notes to tables and figures are deemed to be requirements of this Standard.
Page SECTION 1 SCOPE AND APPLICATION 1.1 SCOPE ........................................................................................................................ 6 1.2 APPLICATION ........................................................................................................... 6 1.3 ALTERNATIVE SPECIFICATIONS.......................................................................... 7 1.4 REFERENCED AND RELATED DOCUMENTS ...................................................... 7 1.5 DEFINITIONS ............................................................................................................ 8 SECTION 2 CABLE SELECTION PROCEDURE 2.1 GENERAL ................................................................................................................ 10 2.2 SELECTION PROCESS............................................................................................ 10 2.3 DETERMINATION OF MINIMUM CABLE SIZE BASED ON CURRENTCARRYING CAPACITY CONSIDERATIONS ....................................................... 10 2.4 DETERMINATION OF MINIMUM CABLE SIZE BASED ON VOLTAGE DROP CONSIDERATIONS ................................................................................................. 11 2.5 DETERMINATION OF MINIMUM CABLE SIZE BASED ON THE SHORT-CIRCUIT TEMPERATURE CONSIDERATIONS ..................................... 12 SECTION 3 CURRENT-CARRYING CAPACITY 3.1 RATINGS.................................................................................................................. 13 3.2 TYPES OF CONDUCTORS ..................................................................................... 13 3.3 TYPES OF CABLE ................................................................................................... 15 3.4 INSTALLATION CONDITIONS.............................................................................. 16 3.5 EXTERNAL INFLUENCES ON CABLES ............................................................... 20 SECTION 4 VOLTAGE DROP 4.1 GENERAL ................................................................................................................ 86 4.2 DETERMINATION OF VOLTAGE DROP FROM MILLIVOLTS PER AMPERE METRE ..................................................................................................................... 86 4.3 DETERMINATION OF VOLTAGE DROP FROM CIRCUIT IMPEDANCE.......... 87 4.4 DETERMINATION OF VOLTAGE DROP FROM CABLE OPERATING TEMPERATURE ...................................................................................................... 88 4.5 DETERMINATION OF VOLTAGE DROP FROM LOAD POWER FACTOR ....... 89 4.6 DETERMINATION OF VOLTAGE DROP IN UNBALANCED MULTIPHASE CIRCUITS................................................................................................................. 90 SECTION 5 SHORT-CIRCUIT PERFORMANCE 5.1 GENERAL .............................................................................................................. 113 5.2 FACTORS GOVERNING THE APPLICATION OF THE TEMPERATURE LIMITS.................................................................................................................... 113 5.3 CALCULATION OF PERMISSIBLE SHORT-CIRCUIT CURRENTS.................. 114 5.4 INFLUENCE OF METHOD OF INSTALLATION ................................................ 115 5.5 MAXIMUM PERMISSIBLE SHORT-CIRCUIT TEMPERATURES..................... 115
APPENDICES A EXAMPLES OF THE SELECTION OF CABLES TO SATISFY CURRENT-CARRYING CAPACITY, VOLTAGE DROP AND SHORT-CIRCUIT PERFORMANCE REQUIREMENTS ...................................... 117 B LIST OF TABLES................................................................................................... 126 C EXAMPLES OF THE APPLICATION OF REDUCTION FACTORS FOR HARMONIC CURRENTS ...................................................................................... 130 D RECOMMENDED CIRCUIT CONFIGURATIONS FOR THE INSTALLATION OF SINGLE-CORE CABLES IN PARALLEL ....................................................... 131
AS/NZS 3008.1.2:2010, Electrical installations Selection of cables Cables for alternating voltages up to and including 0.6/1 kV - Typical New Zealand conditions
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