Unless defined otherwise, what is the maximum overcurrent protection limit for a 12 AWG copper conductor?

The maximum overcurrent protection limit for a 12 AWG copper conductor is established in the National Electrical Code (NEC). According to Table 310.16 of the NEC, a 12 AWG copper conductor can safely handle a maximum of 20 amps under normal conditions. This limit is set to ensure that the conductor operates safely without overheating, which could potentially lead to insulation damage or fire hazards due to excessive current flow.

While there are higher ratings in the options, they exceed the safe handling capability of a 12 AWG copper conductor under typical conditions, potentially leading to violation of electrical safety standards. Thus, adhering to the 20-amp limit ensures compliance with industry regulations and maintains safety standards in electrical installations.