As3008 Cable Selection [work] -

Cables must also withstand the thermal effects of fault currents until the protective device operates. Under short-circuit conditions, a massive amount of energy is converted to heat in the conductor almost instantaneously.

AS/NZS 3008.1 categorizes installation methods to help engineers select appropriate ratings. The method of installation fundamentally alters the thermal resistance of the cable's environment. as3008 cable selection

A crucial aspect often overlooked is the "power factor" of the load. For AC circuits, the reactance of the cable plays a role. AS/NZS 3008.1 provides separate columns for resistance ($R_c$) and reactance ($X_c$), or a composite figure calculated at a specific power factor (usually 0.8 or 0.9). Accurate calculation requires matching the cable's impedance to the load's power factor, especially for larger cables (above 16mm²) where inductive reactance becomes significant compared to resistance. Cables must also withstand the thermal effects of