I have some exam prep materials that references NEC Table 430.250, and then it uses the formula: kW = 1.732 * V * I. It then uses the obtained kW in another formula, kW = hp * 0.746/efficiency, and obtains efficiency = 75%. Based on the current value it uses, the motor is an induction motor. Shouldn't the first formula include the power factor to obtain kW? If power factor is included, then the efficiency would be 94%, which does not seem very conservative.

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