What is the ampacity of a 10 AWG THWN copper conductor connected to a circuit breaker with a maximum termination temperature of 60 degrees Celsius?

To determine the ampacity of a 10 AWG THWN copper conductor connected to a circuit breaker with a maximum termination temperature of 60 degrees Celsius, it's essential to reference the National Electrical Code (NEC) or relevant electrical standards that provide ampacity ratings based on wire gauge, material, insulation type, and temperature rating.

For a 10 AWG copper conductor with THWN insulation, the ampacity can typically be found in NEC tables, which outline the safe current-carrying capacity for various conductors under specified conditions. Given that THWN insulation allows for a maximum conductor temperature of 75 degrees Celsius at terminal connections, this potential allows for a higher ampacity rating.

However, since the circuit breaker has a maximum termination temperature of 60 degrees Celsius, we must refer to the ampacity ratings applicable to that lower temperature. According to the NEC, for a 10 AWG copper conductor with a maximum termination temperature of 60 degrees Celsius, the ampacity is indeed rated at 30 amperes. This aligns with standard practices, ensuring that the conductor does not exceed its temperature rating, thus preventing overheating and ensuring safety.

Hence, the 30 A rating for a 10 AWG THWN copper conductor at a termination temperature of