SC Electrician Practice Questions - South Carolina Electrician Contractor Examination Exam

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Why may a contractor start an ampacity adjustment calculation in the 90°C column for THHN, even when the circuit breaker is marked 75°C?

Because 310.15(A) and 110.14(C) allow the 90°C ampacity to be used for adjustment and correction, provided the final ampacity does not exceed the 75°C termination rating Because Table 310.16 does not include a 75°C column for THHN Because 240.4(D) replaces all temperature limits Because THHN terminations are always 90°C

Correct Answer:

Because 310.15(A) and 110.14(C) allow the 90°C ampacity to be used for adjustment and correction, provided the final ampacity does not exceed the 75°C termination rating

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