Three phase kW to Amps calculations involve a ration of 1000 times kW to the power factor times voltage and an additional factor 1.73 that represents an equivalent of √3 and is added because the circuit is three phase in nature. Also make sure you use the larger voltage of the system voltages, ex) if it's 480/277 use 480 in the formula Calculation of AC three phase Kilowatts to amps Line to line Voltage I (A) = 1000 x P (kW) / (√3 x PF x V L-L (V)). Three phase kW to Amps. P (KW) = P (KVA) x power factor = 100.1 KVA and 0.86 = 86KW. It means that the … Take the amperage reading from each phase and average them (A1+A2+A3 / 3). If you don't have a power factor use 0.9. Determine Kilowatt-hours (kWh) associated with power usage using the formula: P(KW) x hours of use. The formula to find amps for a three-phase AC circuit is a little different from the formula for … Mathematically: I = [kW * 1000] / [E * PF * 1.73] Example: A 3 phase 400 volt circuit has a 50 kW load connected to it. Find the current if the power factor is 0.9. It means that the phase current in amps is computed by 1000 multiplied by the power in kilowatts divided by the square root of three multiplied by the power factor times the line to line voltage RMS in volts. Line to Neutral Voltage I (A) = 1000 x P (kW) / (3 x PF x V L-N (V)). To calculate 3 phase kWh from measuring amps on each phase Use this formula; KW= (volts (avg) x amps (avg) x power factor x 1.732) divided by 1,000. If we assume 8 hours of use and continuing with the example: kWh = P(KW) x hours of use = 86 KW x 8 hours = 688 kWh

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