Based on the 2023 NEC.
Question: The ampacity of the conductors in type NM cable shall be based on _______ degrees C.
See answer below.
Answer: 60
Explanation: Although Sec. 334.112 requires the conductors in NM cable to be constructed with 90° C insulation, Sec. 334.80 requires the ampacity to be based on 60° C.
Lupacchino is a senior design engineer with Gaylor Electric, Inc. in Noblesville, Ind. and serves as an alternate on NEC Code-Making Panel No. 3. He is currently licensed in more than 80 jurisdictions. He can be reached at [email protected]
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