The appliance’s user manual will tell you what outlet the system requires.įour-prong, 240-volt outlets are used to deliver power to heavy-duty appliances. There are different types of 240-volt outlets as well, depending on the application, appliance, and required amperage. If you find these, it’s best to upgrade them as newer outlets are made to meet the latest safety standards. Older types had a three-prong configuration with a backward “L” socket hole and two holes on the side that were placed diagonally. Newer four-prong outlets add a ground wire over older three-pronged ones that helps avoid electrical shock.Ī 240-volt outlet is typically about 4½ inches high and 4½ inches wide. A 240-volt outlet is larger with two vertical side holes, an “L”-shaped hole on top, and a bottom hole that looks like a half circle. You can easily tell the two apart by the 240-volt outlets’ 4 prong design shown above. However, a 240-volt outlet has two 120-volt wires plus a neutral wire and ground wire. Modern-day 120-volt outlets have three prongs, a 120-volt wire and a neutral wire. How a 240-Volt Outlet Differs from a 120-Volt Outlet Higher-powered appliances, such as a washer/dryer, require more electricity, and that’s where a 240-volt outlet is needed. A standard outlet is rated for 120 volts and is suited for plugging in a TV, computer, vacuum cleaner, or other regular household electrical device. An outlet is the connection point between the source of electricity and an electrical device or appliance. For example 14-50R becomes 14-50 receptacle or 14-50 outlet.What is a 240-Volt outlet and why are they so common? Let’s start from the beginning, outlets are, or should be, a familiar device in the home. The R stands for Receptacle (outlet) and the P stands for Plug, we commonly truncate this to just the numbers and add the word receptacle (or outlet) at the end. In the full NEMA number you will see a capital R or P. Be sure to carefully look at your outlet and the chart, it's easy to mistake one outlet for another if your outlet has it's ground pin facing the floor instead of the ceiling or Vice Versa compared to the chart. 110/120 volt outlets can be found mounted in all directions. L6-30 (locking 240 volt 30amp) Twist-Lock 30A 240 volt outlet, my personal favorite locking connector, easy to find in stores, works great for adding adapters to portables EVSE’s equipped with a L6-30 plug.Ģ20/240 volt outlets are commonly install with the ground pin towards the ceiling for safety.TT-30 (Travel Trailer 30amp) 30A 120 volt 3-prong outlet, the older style found in RV parks, not used in residential homes.This is the one the Tesla guys install in their garages. By far the best universal connector to have for an EVSE. 14-50 standard 50A 240 volt 4-prong Range (electric stove top) outlet, also called RV-50 at the RV parks.14-30 standard 30A 240 volt 4-prong Dryer outlet found in homes build in 1996 and newer.10-30 standard 30A 240 volt 3-prong Dryer outlet found in homes build before 1996.6-50 standard 50A 240 volt 3-prong outlet, found in shops and garages used for large welders.6-20 standard 20A 240 volt household outlet, found in homes and motels for running in-wall Air Conditioners, also found occasionally in residential garages.The 5-20 is not as common as a 6-20 outlet with it’s “T” shaped slot as it will accept both 6-20 and 6-15 plugs. 6-15 standard 15A 240 volt household outlet, found in homes and motels for running in-wall Air Conditioners, it’s the smaller brother to the NEMA 6-20 outlet.5-20 standard 20A 120 volt household outlet, required by code in bathroom and behind your refrigerator.5-15 standard 15A 120 volt household outlet, the most common you see everywhere.You can also email us a pic of your plugs and outlets you need help identifying and we would be happy to help. Need some help identifying your wall outlet? We can help! Below is a description of the more common NEMA outlets and their numbers as well as some handy NEMA plug charts.
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