What is the rating of the circuit breaker protecting Conduit II conductors?

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Multiple Choice

What is the rating of the circuit breaker protecting Conduit II conductors?

Explanation:
Sizing overcurrent protection is about matching the breaker to the ampacity rating of the conductors so the wire won’t overheat. For Conduit II conductors, the problem gives an ampacity of 80 A. The protective device must not exceed that ampacity, so the appropriate breaker rating is 80 A. A smaller rating (like 60 A) would unnecessarily limit the circuit, while a larger rating (100 A or 125 A) could allow more current than the conductors can safely carry, risking overheating.

Sizing overcurrent protection is about matching the breaker to the ampacity rating of the conductors so the wire won’t overheat. For Conduit II conductors, the problem gives an ampacity of 80 A. The protective device must not exceed that ampacity, so the appropriate breaker rating is 80 A. A smaller rating (like 60 A) would unnecessarily limit the circuit, while a larger rating (100 A or 125 A) could allow more current than the conductors can safely carry, risking overheating.

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