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How Many Outlets Can Be on a 30 Amp Breaker? – Answered

Written by Edwin Jones / Fact checked by Andrew Wright

how many outlets can be on a 30 amp breaker

Can you use a 30 amp circuit breaker for multiple outlets? How many outlets can you put in that particular circuit? How many outlets can be on a 30 amp breaker?

Yes, you can use a 30-amp circuit for outlets. However, most professionals consider this unsafe if you’re going to use this for most machines. Typically, a 30-amp breaker is designed for heavy-duty appliances like HVACs and water heating systems.

Besides, it can only accommodate 30-amp receptacles if it’s a single-outlet circuit breaker. If it’s a multi-outlet device, we can install a 20-amp circuit to protect the #10 conductor. Then, we can use 20-amp and 15-amp receptacles on the 30-amp circuit.

Learn more about outlet standards and circuit breakers while reading this article.

What Are the Standard Outlet and Circuit Breaker Combinations for Most Homes


20 amps

The standard circuit breaker capacity most homes use for outlets is 20 amps. Furthermore, most standard outlets have a similar rating. Yes, outlets have current ratings too. If your appliance’s power draw exceeds the outlet’s rating, it may melt and cause an accident.


For example, you connect a 20-amp outlet to a 30-amp circuit breaker. If you plug an appliance with a 25-amp power draw to the outlet, the outlet will begin to fail. However, since 25-amp is still below the circuit breaker’s capacity, it will not trip. That’s why you can’t use a 20 amp or 15 amp outlet on 30 amp circuit.

30 amps

So aside from not being standard, a 30 amperes circuit breaker circuit will not protect wiring and outlet with lower capacity.

Having a specific 30 amp outlet and wire is the only way to use your 30 amp circuit breaker. However, you still shouldn’t use it as a common outlet in your house.


A 30 amp outlet usually has a different three or four gang design compared to common outlets in most homes. Furthermore, this 30 amp outlet and breaker are only standard and specific for appliances that need this power rating—like a clothes dryer or a water heating system.

You can watch this video made by Mr. Electric to know the different types of outlets and understand their features.

How Many Outlets Are Suitable to Install in a Standard Circuit Breaker


To maximize a standard 20-amp circuit breaker, the recommended maximum number of outlets you can attach to it is ten pieces.

Furthermore, if the breaker is servicing a room that doesn’t use high-powered devices, you can use a 15-amp breaker instead.

However, you should also consider the appliances you’re going to plug into your circuit. If you’re going to install several high-powered devices on it, like oven toasters, blenders, and portable aircon units, ten outlets might cause the system to overload and trip the breaker.If in case you have nothing plugged in and your breaker keeps tripping, I recommend you to read this guide for how to solve it.

Furthermore, wire installation length is also a significant consideration. Meaning, the amp rating of a circuit breaker may decrease if it’s connected to an extended power cable. As a result, some of your high-powered appliances might not work or trip your breaker. This can happen even if all the plugged devices don’t hit the breaker’s maximum capacity.

Pro Tip: Try not to install the maximum allowable outlets on a circuit, so you have space for expansion. That way, if you add an extra shed or a new room in your attic or basement, you don’t have to add a new electrical circuit in your house.

Can You Use a 12-2 AWG for 30 Amps Circuit


Yes, based on the National Electric Code or NEC, you can use 12-2 AWG cables for THHN or THWN-rated wires. These cables are made for general purposes and can hold up to 194 degrees without taking any damage. It simply means these wires can withstand the heat temperature drawn by a 30 amp circuit breaker.


When you understand circuit breaker and outlet current ratings, you will know the proper way to install a new circuit in your house. Furthermore, it also gives you an idea of how many outlets you can install on your electrical system.

Now that you know how many outlets can be on a 30 amp breaker, did I help you solve your problem? How many outlets are you planning to install together with your 20-amp circuit breaker? Do you have further questions I can answer? Don’t forget to add them in the comments section below!

Related: The Maximum Number of Outlets  You Can Be on a 15 Amp Circuit Breaker.

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