## Can 12-gauge wire handle 20 amps?

RULES OF THUMB “Twelve-gauge wire is good for 20 amps, 10-gauge wire is good for 30 amps, 8-gauge is good for 40 amps, and 6-gauge is good for 55 amps,” and “The circuit breaker or fuse is always sized to protect the conductor [wire].”

## Can I use 14-gauge wire on a 20 amp circuit?

14 AWG must be protected at 15A, according to NEC 240.4(D)(3). 14 AWG can’t be used on a circuit with a 20A breaker. The screw terminals are the better choice if you want to put 15 Amp receptacle on a 20 Amp circuit with 12 gauge wire. You can use the side terminals.

**How far can you run 12 2 wire on a 20 amp breaker?**

After these distances, the circuit will go over the recommended 3% voltage drop. You can run a 12 gauge wire up to 70 feet on a 15 amp circuit. That number drops to 50 feet if you run 12 gauge wire on a 20 amp circuit.

**What cable do I need for a 20 amp breaker?**

Building codes based on the National Electrical Code prohibit the use of 14-gauge wire anywhere on a 20-amp circuit. All wiring in such circuits must be 12-gauge or larger.

### Should I use 15 or 20 amp breakers?

The answer: It’s possible, but not advisable without an electrician evaluating the situation. You should never just upgrade from a 15-amp breaker to a 20-amp one just because the current one is tripping. Otherwise, you may burn your house down via electrical fire.

### Can you use 10 gauge wire on a 20 amp breaker?

Yes, you can use 10 AWG copper conductors with a 20 ampere breaker. The smallest size conductors you could use with a 20 ampere breaker, are 12 AWG copper conductors. There’s no problem using larger conductors, other than cost to you, and difficulties associated with working with thicker conductors.

**What size gauge wire is required on a 20 amp circuit?**

The typical rule of thumb that techs will usually go by is that when you have a 30 amp circuit breaker, 10-gauge wire is the right size to go with. For a 40 amp you need a 8-gauge wire size and for a 20 amp, you will need a 12-gauge wire size.

**What gauge of wire do you use for a 20 amp GFCI outlet?**

For a 20 amp circuit, use 12 gauge wire. For a 15 amp circuit, you can use 14 gauge wire (in most locales).

## What size breaker is used with 10 wire?

If the wire is 10 gauge, it should be on a 30 amp breaker. If you leave it this way, it will work.

## Do you need a 20 amp circuit for microwave?

Microwaves require a 20-amp branch circuit due to constant load and spike issues. Under strenuous use, a microwave could draw nearly the maximum 15 amperes of current regularly for hours. Under this maximum load scenario, 14- gauge wiring could heat up beyond safe levels.