Reply by canadianchips

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Posted on 3 HP wiring for my dust collector and starting surge

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2627 posts in 3478 days

#1 posted 02-28-2012 03:54 AM

One horsepower electric is defined as 746 watts, so three horsepower is 2238 watts. Divide that by 240 volts, and you get about 9.325 amperes. Now you have to consider the power factor, which is the ratio of apparent power to true power, caused by the inductive (reactive) load of the motor causing the current to be out of phase with respect to voltage. You did not say what the power factor was, so lets assume it is 0.8. That makes the current about 11.65 amperes.

That’s running current, at full load. Starting current is often four times higher.

11.65×4 = 46.62 starting.

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