For a circuit using the smallest permitted conductors connected to a 2 hp motor with DETD fuses, what is the minimum size EGC required?

To determine the minimum size Equipment Grounding Conductor (EGC) required for a circuit connected to a 2 hp motor, it is important to refer to the applicable standards in the National Electrical Code (NEC). In general, the sizing of the EGC is based on the size of the largest ungrounded conductor in a given circuit and the specifics of the application, including factors such as overcurrent protection and the type of equipment being used.

For a motor rated at 2 hp, which translates to approximately 1,500 watts for single-phase applications at typical voltages, the NEC provides a table (Table 250.122) that outlines the minimum size EGC based on the rating of the overcurrent protective device. Assuming the motor is protected by DETD (Dual Element Time Delay) fuses, the relevant breaker or fuse size would govern the required grounding conductor size.

In this case, generally, for a 2 hp motor, the protective device could be rated around 15 to 20 amps, which correlates with needing a minimum EGC. According to the NEC, for systems with a maximum overcurrent protection rating that falls within this range, a 14 AWG copper EGC would be deemed acceptable for equipment