SC Electrician Practice Questions - South Carolina Electrician Contractor Examination Exam

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Four 4 AWG copper THHN current-carrying conductors are installed in one raceway in a 38°C ambient. Starting from the 90°C ampacity of 95 A, apply Table 310.15(C)(1) and Table 310.15(B)(1). What is the allowable ampacity, and does it exceed the 75°C termination value of 85 A?

69.2 A, which does not exceed 85 A 76.0 A, which does not exceed 85 A 77.4 A, which does not exceed 85 A 95.0 A, which exceeds 85 A so 85 A governs

Correct Answer:

69.2 A, which does not exceed 85 A

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