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Assuming a power factor of approx. 0.8 which depends on motor but this will error on the side of caution IL =S/1.73*VL S=P/pf 20hp= about 15000 W. S=15000/.8 = 18750 VA.

IL = 18750/1.73*415 = 26A

The motor would draw about 26 A. depending on Load and efficiency

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