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        Q: How do you calculate 3 phase kWh from measuring amps on each phase?
A: The voltage and current will give the kVA , but the kW depending onthe power factor of whatever loading 's connected to the supply . For a ( let 's say ) eleven kV supply , the voltage from line to neutral is11,000/sqrt ( 3 ) which is 6351 v. The kVA on every stage is 6.351times the current , and you just add up the three kVA values to findthe total . At higher voltges like eleven kV the three currents in the lines aregenerally very roughly equals .