Many apprentices and DIYers size cables based purely on (Amps).

Key factors considered by an Australian cable calculator include: AS/NZS 3008.1.1:2017 - Standards Australia Store

20A load, 50m cable, 2.5mm² copper → voltage drop ≈ 14.8V (6.4%) → too high → need 6mm².

Once you hit "Calculate," look at the output:

The primary standard for cable selection in Australia is . It provides the data required to calculate the Current-Carrying Capacity (CCC) and Voltage Drop for various cable types and installation environments.