What is the permitted EGC size for a circuit conducting a 1 hp engine with the maximum size DETD fuses installed?

To determine the proper Equipment Grounding Conductor (EGC) size for a circuit that includes a 1 hp (horsepower) engine fed by maximum size DETD fuses, we first need to consult the relevant electrical codes, specifically the National Electrical Code (NEC).

A 1 hp motor typically draws a current of around 4 to 6 amps, depending on the voltage and efficiency. For establishing the appropriate EGC size, we utilize Table 250.122 of the NEC, which provides guidelines for EGC sizing based on the rating of the overcurrent protection device (in this case, the fuses).

When the circuit is protected by fuses with a specific rating (which can vary), the minimum size of the EGC can be derived from the current rating of the fuses. An EGC size of 14 AWG is acceptable for circuits protected by a fuse that has a rating of up to 15 amps, which is appropriate for a 1 hp engine under standard conditions.

In this scenario, a 14 AWG conductor satisfies the requirements for the EGC given the expected amp draw of the motor and the characteristics of the protective device. This ensures safe grounding for fault conditions, thus reducing the consequences of any