Journeyman Electrician Practice Exam 2025 – The All-In-One Guide to Exam Success!

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What minimum size equipment grounding conductor is required for a branch circuit protected by a 50-ampere rated circuit breaker according to NEC®?

10 AWG

For a branch circuit protected by a 50-ampere rated circuit breaker, the National Electrical Code (NEC) provides guidelines for determining the minimum size of the equipment grounding conductor (EGC). According to NEC Article 250.122, the size of the equipment grounding conductor must be based on the rating of the overcurrent device that protects the circuit.

In this case, for a 50-ampere circuit breaker, the NEC specifies that the minimum size of the equipment grounding conductor is 10 AWG copper or 8 AWG aluminum. Therefore, an equipment grounding conductor size of 10 AWG is appropriate and meets the standard.

This ensures safety by providing a properly sized grounding path in the event of a fault, which is essential for protecting both the equipment and the individuals using it.

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12 AWG

14 AWG

8 AWG

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