People often face difficulties getting the answer to how many receptacles they can put on a 20-amp circuit since the 20-amp circuit is the most common in the US.
So, knowing how much you can plug into a 20-amp outlet is important to avoid overloading and possible electrical hazards.
Here, I’ll dive into the specifics of how many receptacles you can use on a 20-amp outlet, taking into consideration various factors such as wattage and amperage.
I’ll also talk about how important it is to follow electrical safety rules and best practices to keep your electrical system and appliances from getting damaged.
You can use 10 or 12 outlets on a 20-amp circuit or a 20-amp GFCI outlet, as long as the design follows the National Electrical Code’s 80% load rule, which lets you use a maximum of 16 amps. When deciding how many outlets to put in, you should plan for a maximum draw of 1.5 amps per outlet to prevent overloading and make sure safety. For a 20-amp circuit, you should also use wire with a gauge of 10 or 12.
What Is Receptacle?
Electrical receptacles are a type of AC-powered outlet. It’s used for plugging a device into it. A receptacle is also known as a slot or series of slots linked to a wired AC energy source.
Also, it can power electrical equipment and appliances by connecting them to the primary AC power source of a building.
How Many Receptacles Can Be Put on a 20-Amp Circuit?
There are no limits on how many receptacles can be placed in a 20-amp circuit. Say you can put on 3 lights, 3 fans, and 2 outlets to charge your phone or laptop, and so on.
All you need to know is that you should never connect more than 20 amps’ worth of electric appliances to such a circuit.
Practically, if you connect more powered devices than 20 amps to a 20-amp circuit, you create an electrical hazard, and the circuit can catch fire.
You can use up to 10 outlets in a 20-amp circuit. This is due to the 20-amp circuit’s design, which complies with the National Electrical Code’s 80% load rule and can support a maximum load of 16 amps.
For safety and to avoid overloading, it’s best to plan for a maximum draw of 1.5 amps per outlet when figuring out how many outlets to put in.
For a 20-amp circuit, it’s a good idea to use wire with a gauge of 10 or 12. So, if you plan to install multiple outlets, keep in mind that 10 is the standard number of receptacles for a 20-amp circuit.
Converting amps to watts
There is an easy formula that you can use to convert amps into watts.
Watts = Amp x Volts.
For example, I’ll use 120 volts because most rooms in the US run on 120-volt circuits unless it’s a special case like a dryer.
Keep in mind that 1.5 amp is 180 watts. So if you plug in a 1000-watt appliance in a 20-amp circuit, it’ll consume 5.55 amps. So I hope you can decide on your next use.
So, using this formula, you can see that 16 amps are converted to 2880 watts, and 20 amps are converted to 3600 watts. So, you should not run more than 3600 watts on a 20-amp circuit at a time.
How Many Receptacles Can You Use?
Now that you know how to convert amps into watts, you can calculate and connect devices to a 20-amp circuit, keeping in mind that you should not cross the standard limit of 16 amps or 2880 watts.
Now let’s have a look at a simple chart of devices, where you will know how many watts or amps each standard device uses.
|Cell phone Charger||5||0.027|
|Standard LED Bulb||10||0.05|
|Standard Ceiling fan||80||0.44|
|60-inch LCD TV||200||1.11|
|Electric Space Heater||1500||8.33|
Let’s talk about a circuit in the living room. We usually need 2 to 3 LED bulbs, 1/2 of a ceiling fan, an outlet for our TV, an advanced surge protector power strip, or a multi-plug with numerous outlets to charge our smartphones.
So if you count all the devices and calculate, you can put around 18 or 20 receptacles on a 20-amp circuit. But if you plug any coffee maker, microwave oven, refrigerator, toaster, or hairdryer into the outlet, you must keep in mind that each of them uses around 800–1800 watts, or approximately 4.44–10 amps.
So what’s the solution now if you use lots of these types of devices? Well, the answer is straightforward. All you need to do is keep one or two separate 20-amp circuits on a wall in a room, in the drawing room, or in the kitchen, where you can plug your refrigerator, microwave oven, and toaster.
You can also install two GFCI circuits in your bathroom, where you will be able to plug your electric space heater and your hairdryer.
So, in general, you are allowed to put around 10 outlets if each device uses 180 watts on a circuit in a living room. However, you may plug in 1 or 2 receptacles that need more power than an average one or install two or more separate circuits in different walls to get an easy solution.
What should I do if the 20-amp circuit is overloaded?
Having too many high-wattage outlets on the same circuit may be an issue in an older home. You can also often face overload issues. So, now let’s find a convenient solution to this problem.
The first thing to do is unplug as many devices as you can from the outlets and refrain from using too many at once. There are limitations to reducing amp draw through a circuit using that method.
You can follow the above watts-to-amps usage calculation, which will help solve the problem of an overloaded 20-amp circuit and run a second wire from a separate breaker to take the other half of the load.
As I mentioned above, a circuit or an outlet can handle 80% of its rated current load. So, if we are talking about a 20-amp outlet, after calculating according to the above method, we get 16 amps of current that a 20-amp outlet can handle.
Yes. You can use a 15-amp outlet on a 20-amp circuit. As we all know, a 20-amp circuit is good for handling a maximum of 16-amp current flow, so you can put a total of 2880–2900 watts on such a circuit.
Yes. You can use a 20-amp outlet in your kitchen. Because if you want a dishwasher in your kitchen, you must have a 20-amp outlet there. Because a standard dishwasher uses 1800 watts, or 10 amps of current, if you don’t have a minimum of a 20-amp outlet in your kitchen, you can’t plug a dishwasher into the outlet.
Yes, you can. Generally, a fridge uses 700–800 watts or 3.88–4.44 amps, and a dishwasher uses 1800 watts or 10 amps. So if you count them together, you get around 2500–2600 watts, or up to 14.44 amps, which is lower than a 20-amp circuit can handle.