AC Cable Sizing Calculator
Screen a cable size using load current, phase configuration, power factor, ambient/operating temperature, grouping and installation correction factors, then check voltage drop. The ampacity table below is an illustrative design aid — replace it with your approved manufacturer/standard table for final selection.
Enter values and calculate.
Selection sequence
- Calculate design current from kW, voltage, phase and power factor.
- Apply design margin and correction factors to determine required corrected ampacity.
- Check candidate conductor ampacity.
- Check voltage drop at operating temperature.
- Confirm short-circuit withstand, protective-device coordination, installation method, conductor insulation rating, termination rating and applicable standard.