kW to Amps by Wattlebase

What you know

Pick what you have, type it in, and everything else is worked out.

I know the
Supply

Load list

Add each load to see the current on each phase against the supply, for example before adding an EV charger. Worked out at 230 V single phase and 400 V three phase.

    This adds up the connected load. The maximum demand worked out under AS/NZS 3000 (Appendix C) is usually lower, because not everything runs at once.

    Job and your details

    For the printed report. Your business details are kept for the next job.

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    Result

    Three-phase figures assume a balanced load and the voltage between phases (400 V). Horsepower is the motor’s output: input power × efficiency ÷ 0.7457.

    Common loads

    LoadkWSingle phaseThree phase

    A guide only. Use the nameplate current where you have it. Motors draw several times their running current when starting, and this doesn’t size cables or protection: follow AS/NZS 3000 and AS/NZS 3008.1.1.