NM Residential Electrical Inspector Practice Questions - New Mexico CID Residential Electrical Inspector Examination Exam

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Four 12 AWG copper current-carrying THHN conductors supplying multioutlet receptacle circuits are installed in one EMT in a 30°C ambient. Starting from the 90°C ampacity of 30 amperes and applying the 80 percent adjustment of Table 310.15(C)(1), what is the adjusted ampacity, and what overcurrent limit still applies?

Adjusted 24 A, which is below the 25 A 75°C value, so 24 A is the allowable ampacity Adjusted 24 A, but 240.4(D) still limits a 12 AWG copper multioutlet receptacle circuit to 20 A Adjusted 30 A because THHN is 90°C Adjusted 20 A from the 60°C column only

Correct Answer:

Adjusted 24 A, but 240.4(D) still limits a 12 AWG copper multioutlet receptacle circuit to 20 A

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