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A voltage of 240 volts is not a common three phase voltage. Single phase kva of 240 voltas and 50 amps is I x E/1000 = 240 x 50 = 12000/1000 = 12 kVa
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Assuming the 240 volts is phase to phase voltage, and this is a three phase application:
KVA = V*I*sqrt (3) = 20.78KVA
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