For a load fed with 12 AWG conductors connected to a 20-amp breaker, the smallest EGC that can be installed is?

In determining the correct size for the Equipment Grounding Conductor (EGC) when using 12 AWG conductors on a 20-amp breaker, industry standards are essential. According to the National Electrical Code (NEC), the minimum size EGC must be based on the size of the circuit conductors being used and the rating of the overcurrent protection device (in this case, the 20-amp breaker).

For non-flexible conductors, the NEC specifies that for a circuit with conductors of size 12 AWG, the corresponding minimum size of the EGC is 12 AWG when a 20-amp breaker is in place. This means that to ensure adequate grounding for safety and compliance with electrical codes, the smallest EGC that can be installed with 12 AWG conductors fed by a 20-amp breaker is indeed 12 AWG.

Choosing this size ensures that the EGC provides sufficient capacity to safely carry the fault current that could occur during a fault condition, thereby enhancing the safety and effectiveness of the electrical installation.