Earth Cable Size Calculator

Earth cable size can be determined using Table 5.1 in AS/NZS 3000 or by calculation.

Table 5.1 works by specifying a minimum earth cable size based on the active conductor size and the material. The method below is conservative and often over-sizes the earth cable.

Cable Pro Web software calculates earth cable size based on fault loop impedance and short-circuit performance. This often results in smaller earth cable sizes.

Please enter the parameters below and press Calculate.

Related Resources:

Cable Size Calculator

This calculator determines minimum cable size using the method described by the Standard AS/NZS 3008.1.1 and uses the accurate voltage drop method.

Fault Loop Impedance Calculator

This fault loop impedance calculator is based on the Standards. Refer to our article “Understanding Earth Fault Loop Impedance“. 

Cable Pro Web

Cable sizing and maximum demand software in the cloud. No installation, use on any device.

Cable Pro Web

Cable sizing and maximum demand software in the cloud.

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