What is the ampacity of Type UF cable based on conductor temperature ratings?

The ampacity of Type UF (Underground Feeder) cable is indeed based on the conductor temperature ratings of 60°C. When evaluating the ampacity or current-carrying capacity of any cable type, it is essential to refer to the temperature rating of the insulation material that encases the conductors.

Type UF cable typically has 60°C (140°F) rated conductors which means that the current-carrying capacity is determined at this specified temperature. At this rating, the cable is designed to safely handle a certain amount of current without overheating, taking into account factors like the operating environment and installation conditions.

Choosing 75°C or 90°C as potential ampacity ratings would be incorrect for Type UF cable, although those are applicable to other types of cables and conductors with higher temperature ratings. It's also important to point out that a rating of 30°C does not correspond with standard conductor temperature ratings for Type UF cable or other common applications.

Overall, understanding the correct temperature rating is crucial for ensuring safety and efficiency in electrical installations, and for Type UF cable, that temperature rating is firmly established at 60°C.