Electrical Exam Term
Horsepower (HP)
A unit of power used to rate electric motors, equal to approximately 746 watts.
Detailed Explanation
Motor circuits have unique NEC requirements because motors draw high inrush current during startup (typically 6-8 times full-load current). Motor wire sizing is based on NEC Tables 430.247-250 (full-load current), not the nameplate amps. Overload protection is typically 125% of the nameplate full-load amps, while branch circuit protection (short circuit/ground fault) can be 250% or more depending on the motor and protection device type.
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Practice QuestionEasy
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