What gauge wire is needed for a 20-amp circuit?

For a 20-amp circuit, the appropriate wire gauge is 12 gauge. This size is chosen based on the National Electrical Code (NEC) which outlines the requirements for safely carrying current in residential wiring. A 12-gauge wire can handle a maximum load of 20 amps, making it suitable for this type of circuit.

Using the correct gauge wire is crucial for preventing overheating, reducing the risk of fire hazards, and ensuring optimal performance of the electrical system. If a wire gauge that is too small is used, it could lead to excessive heat as the current passes through, posing serious safety risks. Thus, 12 gauge strikes a balance between the capacity needed for a 20-amp load and safety considerations, aligning with standards for residential wiring practices.