# What is the smallest conductor that can legally be connected to a 20 amp circuit breaker?

## What is the smallest conductor that can legally be connected to a 20 amp circuit breaker?

1 Answer. Yes, all conductors protected by a 20 ampere circuit breaker must be at least 12 AWG copper.

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

12-gauge
A 20-amp circuit, protected by a 20-amp breaker or fuse, must be served by 12-gauge or 10-gauge wire.

Can you connect 12 gauge wire to 14 gauge wire?

It’s perfectly safe to use it. Don’t worry about confusing future workers. If they want to add something to the circuit, they will have to go turn off the circuit breaker first, and then they will see they are working with a 15 amp circuit.

Can you put 14 gauge wire on a 20 amp breaker?

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.

### What is the maximum circuit breaker size that can be used on a #12 wire?

30 amps
Maximum Breaker Size is 30 amps. You can use a 20 amp circuit breaker with 12/2 Romex as 12/2 wire is rated for 20 amps. Always remember THE BREAKER IS THERE TO PROTECT THE WIRE NOT THE APPLIANCE !!!

Can a 12 gauge wire be used on a 20 amp breaker?

For a given wire size, increasing the current increases voltage drop. A general rule of thumb (and code minimum) for residential wiring in the United States is to use no smaller than 12 AWG wire on a 20 A circuit. Install 2 20 amp receptacles on a 30 amp breaker in parallel. Can you connect 14 gauge wire to 12 gauge?

How big of a breaker wire do I Need?

If you want a simpler chart for the standard type of wire, scroll down further. As you can see from the graph, a 6 gauge is the safe choice if you have a 220v 50 amp that you need to power, whereas a 12 gauge is perfect for your 220v 20 amp needs.

## Can a 13 amp device be used on a 20 amp circuit?

Yes. But realize that the total current draw of anything else operating combined with your 13 amp device can’t exceed 20 amps without the circuit breaker or fuse tripping to protect the circuit. The safest approach is to utilize no more than 80% of the circuit’s capacity. In this case that would be 16 amps.

## Can a 14 gauge wire carry 20 amps?

So yes, a 14 gauge wire will safely carry 20 amps, no problem. It won’t violate the laws of physics, it isn’t a fire hazard, there’s no problem, it’s done all the time in electrical equipment without any trouble. Here’s how you get in *HUGE* trouble with 14 gauge wire on a 20 amp breaker in home or commercial wiring.