Where bare or covered conductors are installed with insulated conductors, the temperature rating of the bare or covered conductors shall be equal to the _______ temperature rating of the insulated conductors for the purpose of determining ampacity.
A) highest
B) lowest
C) nominal
D) average
Find the Answer
Answer: B
As outlined in Sec. 310.15(B)(4) of the 2014 NEC, “Where bare or covered conductors are installed with insulated conductors, the temperature rating of the bare or covered conductors shall be equal to the lowest temperature rating of the insulated conductors for the purpose of determining ampacity.”
Owen is the owner and president of National Code Seminars and the holder of master electrician certifications in 46 states. He can be reached at [email protected].