Can I Put a 25 Amp Breaker on 12 Gauge Wire?

You want to upgrade your circuit breaker. Maybe you are currently using a 20-amp circuit breaker and you want to move to a 25-amp circuit breaker. Should I do the same to the wires? Will the 12 gauge wire be ideal for the new 25-amps circuit breaker?

Read on as we try to answer this question, and even give you more insights on this.

Importance of upgrading wires

before we even answer this question, let’s discuss the issue of upgrading your wires whenever you upgrade the circuit breaker.

There is an important reason why you need to switch to the larger wire gauge from the smaller one. It is all about safety.

The bigger the wire gauge, the more current it can carry, and this is where safety comes into place. When you use a large wire gauge, you will be able to carry more current safely. This is because of the fact that there is less resistance in a big wire, and therefore it has less heat generated which means less chances of fire or overheating.

So, which wire size?

Now let’s go back to our question of whether we should use 12-gauge wires for our 25-amp circuit breaker.

This question has two sides to it: how much current will pass through the circuit, and what size wires should we use?

First part We need to look at how much current will pass through the wires when we upgrade from 20 amps to 25 amps (remember that both circuits are connected). Will there be an increase on 15 amps?

While it is normal to use the same wires for the circuit breakers, this is not something that professional electricians will do. The ideal wire size for the 25-amps circuit breakers is 10-gauge wires. In fact, this size is ideal for circuit breakers rated between 25-30 amps.

A 10 AWG wire will be capable of withstanding the high current and heat whenever your circuit breaker trips. In short, it is better than the 12 AWG wire.

What is the largest breaker for 12 gauge wire?

The largest circuit breaker that you can use with a 12 gauge wire is 20 amps circuit breaker.

However, this circuit breaker size is ideal for use with a 20-amp circuit.

For circuits that are rated at 25 amps or higher, you will need to use 10 gauge wires and a 30-amps breaker. Ideally, you should use the same gauge wires for both the breaker and the wire.

What is a 25 amp breaker used for?

What is a 25 amp breaker used for?

image source  Forum Nachi

25- amp circuit breakers are quite common in most households. They are perfectly designed for short-circuit and as well as overload protection. In other words, this circuit breaker is used to protect your home from fire.

A 25-amp circuit breaker is ideal for use with a 15-amp or 20-amp circuit. This can be used for light and as well as standard appliances such as toasters, hair dryers, blenders and more.

In fact, a 25-amp circuit breaker can also be used to protect your home from fires that are caused by these types of appliances.

However, if your home has circuits that are rated at 50 amps or higher; you will need to use a 30-amp circuit breaker.

What is the size of a 20 amp outlet?

20-amp outlets are quite common in most households. They are usually installed near the kitchen area and they serve as an ideal source of power for most small appliances such as microwaves, coffee makers and more.

In fact, this is the most common outlet size in most households today. If you happen to have a 20-amp outlet in your home; then you will need to buy a 20-amp circuit breaker for it.

How far can I run 12 gauge wire on a 20 amp breaker?

When it comes to circuit breakers and wires, there is always one factor that is important even though most people tend to ignore. That is the distance of the wires.

Usually, a 12 gauge wire will be able to cover up to 70 feet when used on a 15-amp circuit. When it comes to a 25 amps circuit, the same wire will be able to cover up to 50 feet without experiencing a voltage drop. Beyond the distance that we have mentioned, the circuit will start recording a 3% voltage drop. This means that you will have to upgrade your wires.

What if we use a 12 gauge wire with a 25 amps circuit breaker?

In this particular case, you will need to use a heavier wire that is rated for a 25-amp circuit. This is because the voltage drop will be too much if you use the same 12 gauge wire on a 25-amp circuit breaker. This is the main reason why we recommend a 10 AWG wire for the 25 amps circuit breakers.

When it comes to circuits and wires, it is always best to follow the manufacturer’s instructions since they are not only precise when it comes to voltage drop but they can also help you save money in the long run.

If you have any questions or concerns about using your circuit breakers and wires; then don’t hesitate to call a professional electrician or an electrician’s apprentice near your area.

Will a 14 gauge wire trip a 25 amp breaker?

To be frank, a 14 gauge wire is too small even for a 20 amp circuit breaker. So, it will be impossible to use it with a 25 amp breaker. You already know the dangers of using a small wire on a highly rated circuit breaker. First, you will get a voltage drop on the circuit breaker, and second, you will get an overload.

You should also know that a 14 gauge wire is way too small to be used in any type of electric circuit. Usually, 14 gauge wires are used for low voltage circuits such as the ones found inside another device. This is why you should avoid using this type of wire on a 25 amp circuit breaker.


I hope now you know the right size of wire to use on a 25 amp breaker. Get a good quality 10 gauge wire and you will not have to worry about any issues that would affect the breaker performance.

If you want to find more Electronic Components Distributors, please check out the following articles:

Electronic Components Distributors In the USA

Electronic Components Distributors In UK

Electronic Components Distributors In China

Electronic Components Distributors In India

Electronic Components Distributors In Singapore

Electronic Components Distributors In Malaysia

Electronic Components Distributors In Vietnam

Electronic Components Distributors In South Korea

Electronic Components Distributors In Taiwan

Electronic Components Distributors In Hong Kong

4.7/5 - (426 votes)

Leave a Reply

Your email address will not be published. Required fields are marked *

Post comment