What is the minimum size aluminum equipment grounding conductor for an individual branch circuit supplying a twist-lock receptacle rated at 20 amperes?

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Multiple Choice

What is the minimum size aluminum equipment grounding conductor for an individual branch circuit supplying a twist-lock receptacle rated at 20 amperes?

Explanation:
Sizing an equipment grounding conductor follows the overcurrent protection rating. For aluminum conductors, NEC 250.122 specifies the EGC size based on the circuit’s OCPD. With a 20-amp branch circuit, the aluminum EGC must be 8 AWG. This larger size compared with copper reflects aluminum’s characteristics and ensures a reliable fault path to trip the breaker. The twist-lock receptacle type doesn’t change this requirement; the protection is still determined by the 20 A rating. So the minimum aluminum EGC size is 8 AWG.

Sizing an equipment grounding conductor follows the overcurrent protection rating. For aluminum conductors, NEC 250.122 specifies the EGC size based on the circuit’s OCPD. With a 20-amp branch circuit, the aluminum EGC must be 8 AWG. This larger size compared with copper reflects aluminum’s characteristics and ensures a reliable fault path to trip the breaker. The twist-lock receptacle type doesn’t change this requirement; the protection is still determined by the 20 A rating. So the minimum aluminum EGC size is 8 AWG.

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