The ampacity of type UF cable shall be that of ___ conductors.

The ampacity of type UF cable shall be that of ___ conductors.

• A. 60°F
• B. 75°C
• C. 140°C
• D. 60°C

Answer: (D)

Type UF cable’s ampacity is determined by the ampacity of conductors with a 60°C insulation rating. NEC specifies that UF cable uses the 60°C column for calculating its ampacity, to ensure compatibility with terminations and the underground installation environment. Even if the insulation inside UF cable could tolerate higher temperatures, the code bases its ampacity on 60°C conductors. The other options don’t represent valid temperature ratings used for UF ampacity calculations, and 60°F isn’t a relevant conductor temperature rating.

Type UF cable’s ampacity is determined by the ampacity of conductors with a 60°C insulation rating. NEC specifies that UF cable uses the 60°C column for calculating its ampacity, to ensure compatibility with terminations and the underground installation environment. Even if the insulation inside UF cable could tolerate higher temperatures, the code bases its ampacity on 60°C conductors. The other options don’t represent valid temperature ratings used for UF ampacity calculations, and 60°F isn’t a relevant conductor temperature rating.