The core equation governing the standard is:

Introduction: The Silent Guardian of Electrical Safety In the world of electrical engineering, few documents carry as much weight in Australia and New Zealand as AS/NZS 3008.1.1 (commonly referred to as AS3008). This standard, titled "Electrical installations—Selection of cables—Cables for alternating voltages up to and including 0.6/1 kV," is the definitive guide for determining the correct size of electrical cables.

[ I = \sqrt\frac\Delta\thetaR_ac \cdot T_4 ]