What is the minimum wire gauge required for a 20-amp circuit?

The minimum wire gauge required for a 20-amp circuit is indeed 12-gauge wire. This size is necessary to handle the current without overheating, as it can safely carry the amount of current without exceeding its temperature rating. The National Electrical Code (NEC) provides guidance on wire gauge sizing based on the amperage of the circuit, ensuring safety and efficiency in electrical installations.

Using 12-gauge wire for a 20-amp circuit provides a suitable balance between conductivity and safety, as it can handle up to 20 amps for general wiring in branch circuits within residential and commercial settings. Proper wire sizing helps prevent potential hazards such as electrical fires, equipment malfunction, or tripped breakers, which can occur if a wire is too small for the amount of current it needs to carry.

In contrast, smaller gauges like 14, 16 or larger gauges like 10 are not suitable; a 14-gauge wire, for instance, is rated for 15 amps, which is under the necessary rating for a 20-amp circuit. Therefore, it's crucial to consult electrical code standards while planning and executing electrical work to ensure safety.