If a 14 AWG XHHW-2 copper conductor is connected to a 60°C circuit breaker, what is its ampacity?

To determine the ampacity of a 14 AWG XHHW-2 copper conductor when connected to a 60°C circuit breaker, it's essential to reference the National Electrical Code (NEC) tables that specify conductor ampacity based on the temperature rating of the conductors and the applicable installation conditions.

According to NEC Table 310.16, for copper conductors (like XHHW-2), the ampacity for 14 AWG at a 60°C ambient temperature is indeed rated at 15 amps. This is the maximum safe continuous current the conductor can carry without exceeding its temperature ratings under normal operating conditions.

Here, the temperature rating of the circuit breaker is crucial because it affects the allowable ampacity of the conductor. Since the 60°C rating indicates that the breaker is designed for use with conductors that are also rated up to that temperature, it aligns with the 15 A rating for the 14 AWG XHHW-2 copper conductor.

Thus, the correct choice is 15 A, as it accurately reflects the permissible ampacity under the specified conditions. This knowledge is essential for ensuring that the electrical system operates safely and efficiently without the risk of overheating or damage.