[ I = \fracP\sqrt3 \times V \times \textPower Factor ]
The current capacity of a cable depends on Derating Factors (Correction Factors). Standard tables give ratings for specific ideal conditions. If your conditions differ, you must calculate the Required Capacity ($I_\textrequired$) before selecting a cable: how to cable size calculation
Look up the that can carry your load current. [ I = \fracP\sqrt3 \times V \times \textPower
Rule: Ib≤InRule: cap I sub b is less than or equal to cap I sub n Step 3: Apply Environmental Correction Factors how to cable size calculation