Cable Sizing Calculator AS/NZS 3008.1.2

Automatic cable sizing, voltage drop, derating factors, fault loop, conduit sizing, short circuit calculations.

Tutorial Video

 

New Zealand Cable Sizing Standard

This Cable Sizing Calculator can calculate minimum active, neutral, and earth cable sizes in compliance with New Zealand Standards AS/NZS 3008.1.2 and Wiring Rules AS/NZS 3000. It covers all cable types, installation methods, and derating factors in the standards.

This cable sizing standard applies to circuits up to 1,000 V AC or 1,500 V DC.

The calculator follows the cable sizing procedure outlined in New Zealand Standard AS/NZS 3008.1.2 and the rules related to cable sizing in AS/NZS 3000.

Assumed conditions:

  • Ambient air temperature: 30 °C
  • Soil temperature: 15 °C
  • Soil thermal resistivity: 1.0 K·m/W
  • Standard depth of burial: 0.5 metres (500 mm)
    This is consistent with the Australian standard rating factors that apply if the burial depth varies.
  • Installation and grouping: Reflects New Zealand’s cooler climate and local installation methods

 

Cable Sizing Procedure

Refer to the technical content under the Australian Standard cable sizing calculator page.