I’ve been asked to calculate power usage of a machine to works out how much it costs to run. Current draw is: L1: 9.71 L2: 9.61 L3: 11.14 N: 7.78 Obviously when designing a circuit you would base it in the highest phase ampage. But is power usage worked out the same way? Or are three phases added together because of the unbalanced load? KVA= 11.14 x 400 x 1.732 x / 1000 x unit price Or is it: KVA= 3x 10.15 x 400 x 1.732 / 1000 x unit price Never had to do this before! Thanks.