To calculate cable size, first ensure that the cable current carrying capacity is equal to or greater than the circuit design current. Next, calculate the expected current divided by the thermal insulation correction factor and the semi-enclosed fuse factor of 0.725 where applicable. This results in the correct cable size required for your power needs.

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To calculate cable size, you can use the Cable Size Calculator which is available at the Electacourse website. In this calculator, you simply enter a few known parameters such as length of cable run and load current, select your cable material, method of installation and circuit protection and hit 'Calculate' so as to get your cable size.

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