A 20-amp breaker should feed a minimum ______ conductor.

A 20-amp breaker should feed a minimum 12 AWG conductor based on the National Electrical Code (NEC) guidelines. The NEC specifies that for branch circuits rated at 20 amps, the minimum allowable wire size is 12 AWG. This wire size is capable of safely carrying the current without overheating under normal operating conditions.

Using a conductor that is too small can lead to excessive heat generation, posing a risk of insulation failure and potential fire hazards. Therefore, 12 AWG is the smallest size that ensures safe operation when connected to a 20-amp breaker. Larger conductors, such as 10 AWG, can be used, but they are not required for a 20-amp circuit, making 12 AWG the minimum standard.