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Thanks mm I am now very confused, let me explain A Eurotherm engineer came into our plant this moprning to size up a AC drive/motor replacement for a 22kw Kopp variator and motor (mechanical speed control). The supply to the existing motor is sized at 100amp/3 phase. I asked what was the largest...

This will be a bit basic to some I know, but here goes. Using ohms law in calculating single phase, I would do the following: I=P/V eg = I=2000/240 = 8.3 amps, However in three phase do you do the same ie. I=P/V eg I = 5000/415 = 12 amps When sizing a circuit breaker for the last calc would...