Can you put 12 wire on a 25 amp breaker?

Asked By: Amin Cutelo | Last Updated: 1st April, 2020
Category: home and garden indoor environmental quality
4/5 (6,622 Views . 21 Votes)
A 12 gauge wire is rated for 25 amps. NEC only allows for it to be protected at a max of 20 amps (unless following an exception for motor loads).

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In respect to this, what wire do I use for a 25 amp breaker?

This application requires a 25 amp circuit breaker. Wire size is a very important part in sizing a circuit. For circuit breakers up to 15 amps, use 14 gauge wire or larger. For a 20 amp breaker, use 12 gauge wire or larger.

Additionally, can you put a 30 amp breaker on 12 gauge wire? A 30-amp breaker does not operate safely with a 12-gauge wire. The minimum wire size that is allowable for use with a 30-amp breaker is 10 gauge. A smaller gauge of wire indicates a larger diameter and the ability to carry more current safely. Twelve-gauge wire is acceptable with 20-amp or smaller circuit breakers.

Beside above, can I replace a 20 amp breaker with a 25 amp breaker?

If it is 20 amps or less, the #12 wire is fine. Then check the Maximum Overcurrent Protection (MOCP) or Max Fuse Size. If it says 25 amps or higher you can change the breaker to 25 amps.

What amperage can 12 gauge wire handle?

20 Amps

35 Related Question Answers Found

Will 8 gauge wire carry 50 amps?

8 AWG may carry a maximum of 70 Amps in free air, or 50 Amps as part of a 3 conductor cable. David, if that cable is NM (Romex) then it actually cannot carry 50 amps.

What size wire do I need for a 30 amp breaker?

Any circuit fused for 30 amps must use a minimum of 10 ga copper or 8 ga alu. Longer runs may require an upgrade of wire size. In your case, use at least 10 copper for your welder regardless how far it is from the breaker panel.

Can 10 gauge wire handle 40 amps?

“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].”

Will a 12 2 wire carry 30 amps?

Intentionally overload one 12-2 cable. This is also bad, but not as bad as paralleling, but there may be a way to "make it legal". If you look in the code book, 12 AWG wire is legal to 30 amps if you can run it at 90 degrees C.

Can 10 gauge wire handle 35 amps?

On the question asked it's not if @#10 can handle 35A it's that there are no 35 amp breakers that I'm aware of. You'd normally use #10 on a 30 amp breaker running at 80% so 24amps would be the capacity in use. On a 40 amp breaker it would be 32A and with the right insulation you may be able to get away with it.

Is a double pole 20 amp breaker 40 amps?

There are two types of standard breakers: single-pole and double-pole. Single-pole breakers are rated for 120 volts and 15 or 20 amps. Double-pole breakers, on the other hand, are typically rated for 20 to 60 amps and supply 240-volt power to large appliances, like electric dryers and ranges.

Do they make a 25 amp breaker?

25 amp breakers are available, but are generaly a “non-prefered” size, that is to say that few electricians would have them on the truck so they commonly use a 30 amp.

What amperage will a 20 amp breaker trip at?

The NEC does specify that a circuit breaker shouldn't handle more than 80 percent of the load for which it is rated unless the breaker is labeled otherwise. By this standard, the total current draw on a 20-amp circuit shouldn't exceed 16 amps.

Can you up the amps on a breaker?


No! The only safe way to increase the circuit's capacity is by replacing the wire with one of adequate gauge. For 20 amps, 12 AWG copper is adequate for up to about 100 feet. If you simply replace the breaker, the wire can overheat and ignite the building from inside the walls.

How many outlets can be on a 30 amp breaker?

It is going to depend on the layout and size of your house, but you get the idea. Be safe! If any of this is confusing in any way, you should consult a local professional. Install 2 20 amp receptacles on a 30 amp breaker in parallel.

Can you change a 20 amp breaker to 30 amp?

Different question and the answer is "It depends". But in general the answer is "No, do not go and put a 30 amp breaker in place of a 20 amp breaker because the wiring is most likely 'sized' for the 20 amp load and -may- overheat if a 30 amp load is used with wiring sized for a 20 amp load."

What are 30 amp breakers used for?

Double-pole breaker
The 15-amp and 20-amp breakers often handle baseboard heaters, 30-amp serve water heaters and electric dryers, 40- and 50-amp are for electric ranges, and the 70-amp could serve a large air conditioner or a subpanel.

How many amps does an 1100 watt microwave use?

Divide the number of watts by your line voltage (e.g. 110v in the US) to get amps, because P (power) = V (volts) x I (current). So a 1100 watt oven / 110 volts is 10 amps.

Can you replace a 15 amp breaker with a 20 amp breaker?


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 change a 10 amp breaker to 20 amps?

The answer is yes. If the wiring is rated for the higher amperage then you can substitute the higher amperage circuit breaker. (This is true as long as you follow other rules, such as matching the breaker to the equipment and to the receptacle(s). By the way, this has nothing to do with the distance.

Can I replace a 25 amp breaker with a 30 amp breaker?

Yes if the max over current protective device is 25 amp and you have a 30 it is ok to down size. it is always ok to reduce the breaker size if the wiring is legal or compliant with the larger breaker.