No, use square root of three.I thought I did.
240v(rms 60Hz) 3ph, 20A per leg (measured)
240 x 20 x 3 = 14.4kW
Then there is efficiency, so input KW is greater than output KW always! Or you invented a perpetual motion machine....
Last edited by FionaZuppa; 08-10-18 at 06:50 PM.
but even in 240 delta, 20A per leg is still ~2.5kW over rated HP, if PF=0.9 under load assumably.
IF the supply is 240 wye you need to specify that clearly, as it is relatively uncommon. For 240 wye you would NOT generally use a motor nominally rated at 240V since the motor rating almost always specifies the line to line (across winding) voltage. But, yes there can be motors wound for 240 wye.
You are correct that when 240 is the wye voltage the power calculation uses a full factor of 3.
If you are using the line to line voltage, you need to match it with the line to line current, which is NOT equal to the individual line current. That is where the factor of sqrt(3) comes in then.
Fair enough. Can we see a pic of the motor spec plate.
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