The ampacity of UF cable shall be that of ___ degree C conductors.

The correct ampacity of UF (Underground Feeder) cable is based on the 60-degree Celsius conductors. This is established in the National Electrical Code (NEC) and is a crucial standard for electrical installations.

When considering ampacity ratings, it's essential to understand that different temperature ratings correspond to different conductor materials and insulation types. For UF cable, which is typically used in residential applications and for underground installations, the conductor insulation is generally rated for 60 degrees Celsius. Therefore, when determining the maximum allowable current (ampacity) that the cable can safely carry, one must refer to the 60-degree Celsius rating.

This rating is significant because it affects the sizing of the conductors, ensuring safety and preventing overheating, which can lead to insulation damage or failure. In practical terms, this means that when installing UF cable, installers and electricians rely on the 60-degree Celsius ampacity to ensure the circuit can handle the expected load without exceeding safe temperature thresholds.

Ampacities based on higher temperature ratings, such as 75, 90, or 105 degrees Celsius, would apply to different types of conductors or insulation designed for environments where higher temperatures are acceptable. Thus, the choice reflecting the 60-degree Celsius conductor rating is the