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First of all, circuit breakers are rated in amps, not horsepower. Theequivalent between HP and electricity is 1 HP = 746 watts. That is a 1 HP motor requires 746 watts of power to operate it , regardless of the voltage. If you have a 250 amp circuit breaker, it is likely the main breaker to your residential panel. (?) The potential HP the panel could provide could be determined by multiplying the 250 amps times the panels voltage (208,220, 240) and divide the sum by 746.
The horsepower rating of a 250 amp circuit breaker can be determined by using the formula: HP = (V x A x Eff) / 746, where V is the voltage (in volts), A is the amperage (in amps), and Eff is the efficiency factor (usually 0.8 for typical motors). Plug in the values and calculate to find the horsepower rating of the circuit breaker.
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