Duplex receptacle outlet

Duplex receptacle outlet DEFAULT

Split Receptacles

Electrical101 BackgroundSitemapBoltBoltSplit Receptacle, Different CircuitsSplit Receptacle, Same Circuit

Switched line for floor

 or table lamp

Split Receptacle Diagram

Neutral

Neutral terminal screws connected by metal tab

Switched Split Receptacle Wiring Diagrams

Always hot

A duplex receptacle has removable metal tabs that electrically connect the two terminals together on each side of the receptacle. A split receptacle has one or both tabs removed to isolate each terminal from the other. In most cases, only the line tab is removed.

Switched Split Receptacle

A switched split duplex receptacle (also known as a “half hot”) is used to control a table or floor lamp with a wall switch near the room entrance. Half of the duplex is connected to the switch and the other half  is always hot. Switched duplex receptacles are rotated 180 degrees from the orientation of other receptacles in the house for identification. The tab on the receptacle that connects the line terminals together is removed so that each half of the receptacle can operate independently.

Split Receptacle, Same Circuit

Split Receptacle, Different Circuits

Split receptacle rotated 180 deg from conventional orientation

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Wiring for Split-Wire or Split-Feed Outlets

A split outlet is a duplex outlet, or receptacle, with one half of the outlet that has power all the time and one half that is controlled by a switch. If you have a bedroom that has no overhead light, chances are at least one of the receptacles in the room is a split receptacle. The National Electrical Code requires that bedrooms have a light fixture controlled by a wall switch, and when the construction has not included an overhead light, the standard solution is a plug-in light controlled by a wall switch. The bottom receptacle on the outlet remains constantly hot for other uses.

Most split receptacles are fed by a single circuit, but it's possible to wire a receptacle to be fed by two different circuits, as is often done in older installations where a single outlet serves a dishwasher and garbage disposer.

How to "Split" a Receptacle

Standard duplex receptacles have two halves (each with a set of slots for a plug), and each half has a hot and a neutral wire terminal. The two receptacle halves have a continuous electrical pathway connected by metal strips, called connecting tabs. When the tabs are intact—as they are when receptacle comes from the factory—you can connect one hot wire to either hot terminal and connect one neutral wire to either neutral terminal, and both halves receive power. To convert the receptacle to a split duplex receptacle (also called a split-tab receptacle), you simply break off the tab between the hot terminals. This is easy to do with needle-nose pliers.​

With the tab removed, you must connect a different hot wire to each of the hot terminals in order to supply power to both halves of the receptacle. Because the neutral tab remains intact, you can connect a single neutral wire to either neutral terminal so that the two outlets share a neutral. However, with some configurations, an additional neutral wire is used as a hot wire for the switch; in this case, the neutral should be labeled with a band of black or red tape, indicating that it is hot. 

Split Receptacle Circuit Wiring

In the standard wiring configuration for a switched split-wired receptacle, a two-wire cable (with a hot, neutral, and ground) supplies power to the switch or receptacle, and three-wire cable (with red and black hot wires and a white neutral) then brings power from the switch to the split receptacle, where the tab between the hot terminals on the receptacle is removed.

At the switch box, the black wire from the two-wire feed cable connects to one of the screw terminals on the switch, using a pigtail, and to the black hot wire in the three-wire cable leading to the receptacle. This wire will provide constant power to the non-switched half of the receptacle. The red-hot wire from the three-wire cable connects to the other switch terminal. This will power the receptacle half controlled by the switch.

What Is a Pigtail?

A pigtail is a short wire that connects circuit wires to an electrical component or device. It can be useful to extend the length of a circuit, as well as to link several wires together to simplify a connection.

The white neutral wire from the feed cable connects to the white neutral wire running to the receptacle box (there is no neutral connection on a standard switch).

At the receptacle box, the black hot wire from the three-wire cable (coming from the switch) connects to the hot screw terminal on the non-switched half of the receptacle. The red-hot wire from the three-wire cable connects to the hot screw terminal on the switched half of the receptacle. The white neutral wire connects to either of the neutral screw terminals on the receptacle.

The bare copper ground wires in both boxes are connected to the green ground screw terminals on the receptacle and switch, using pigtails. If the electrical boxes are metal, an additional pigtail grounds the box to the circuit wiring.

It's important to note that this is the standard configuration and that other configurations are common and will affect the nature of the wire connections. For example, when the switch is at the end of the loop (when the power source passes through the receptacle box before reaching the switch), the wiring will look different. And when a wall switch controls multiple receptacles, the connections will vary slightly.

Split Receptacle With 2 Circuits

As mentioned, a receptacle can be split and receive power from two circuits. Such a configuration is often used in kitchens, where two circuits power several split receptacles above the countertop, with one circuit powered the top halves, the other circuit powering the lower halves. 

Either circuit can be switched or not switched, as applicable. In such a situation, the receptacle can be wired with a single 3-wire cable so that a single neutral wire serves both circuits, while the red and black wires each control separate circuits, each powering one-half of the split receptacle. The black and red hot wires of the cable each connect to one of the hot terminals on the receptacle, which has had its connecting tab removed.

The important thing to remember is that even though there are effectively two 120-volt circuits in this scenario, they must be protected by a single double-pole (240-volt) circuit breaker in the service panel. Here's why: If you connected each of the circuit's hot wires to a different single-pole breaker, you (or someone else) might turn off just one of the breakers before working on the receptacle. This would leave half of the receptacle on which is a very dangerous situation. By connecting both hots to a double-pole breaker, you can't shut off one circuit without shutting off the other. 

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Is a duplex receptacle counted as one or two outlets for branch calculations?

There is a limit on the number of plugs for non-residential projects.
enter image description here NEC 220.14(I) Each yoke is counted at 180 VA. If there is one outlet, two outlets (most common) or 3 outlets it is still counted as 180 VA. If there are (4) or more outlets then it is counted as 90 VA per outlet.

What you are describing, a double gang box, with (2) duplex outlets will equal 360 VA. Having a total of (3) pairs of duplex outlets will be 360 * 3 = 1080 VA. Since each duplex is 180 VA it can also be counted as 180 * 6 = 1080 VA.

The long power strips that you are used to with 10 or 12 outlets is commonly called plugmold. In the NEC it is referred to as a fixed multioutlet assembly. Per NEC 220.14(H) the load depends on if the plugs get used simultaneously or not. Simultaneous use equals 180 VA per foot of length. Non-simultaneous use equals 180 VA per 5 foot length.

answered Feb 13 '18 at 13:32

SwansonSwanson

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How To Install A Duplex Receptacle... THE CORRECT WAY!

Double Electrical Outlet on Wall

Trying to choose between which electrical outlet you need and which one you want can be difficult. Do you want to be safe and simple with a GFCI outlet, update your home with a USB outlet, or be technologically advanced with a smart outlet?

The possibilities are endless, so hopefully this guide will provide some assistance. 

Single Outlet

Single Electrical OutletA single outlet features one receptacle. Depending on the type of single outlet you purchase, the electrical outlet can be tamper resistant (TR), weather resistant (WR), or even a combination of both.

These electrical outlets can be used on a single branch circuit or with other outlets on the same circuit and are great for both commercial and residential use.

Single electric outlets can work for both a 120V single outlet for small appliances, such as a power tool, or 220V outlet to connect an AC unit.

 

Duplex Outlet

Double OutletA duplex outlet has two receptacles to use for power. A duplex receptacle outlet is very similar to a single outlet where it can be TR, WR, or both!

Duplex receptacles have different amperages and can handle different amounts of power, so make sure to pay attention to the “Amps” your outlet can handle.

A duplex outlet can also handle different voltages (V), whether you need 125V for your washing machine or 250V for your electric dryer.

Duplex Receptacle and decora outlets are typically impact and rust resistant to meet NEC safety standards. Most outlets are made of a heavy-duty thermoplastic and can typically fit into existing wiring boxes for an easy installation process.

GFCI Outlet

GFCI OutletA GFCI outlet is the most popular and the most safe electrical outlet for both residential and commercial locations. The GFCI outlet is designed to quickly turn off the outlet’s power when a short circuit or ground fault is detected.

These tamper resistant outlets fall in line with the 2017 National Electric Code regulations and are the perfect replacement to any duplex receptacle.

The NEC now requires all GFCI protection for all 15-amp and 20-amp 125V outlets installedin the following locations:

  • Bathrooms
  • Garages
  • Outdoors
  • Crawl Spaces
  • Unfinished Basements
  • Kitchen Countertop Spaces
  • Sinks
  • Boathouses
  • Bathtubs and Shower Stalls
  • Laundry Areas

GFCI protection is also required for:

  • All single-phase receptacles rated 50 amps or less, not exceeding 150V to ground
  • 3-phase receptacles rated 100 amps or less and not exceeding 150V to ground

These requirements mean that GFCIs need to be installed in the following locations:

  • Bathrooms
  • Kitchens
  • Rooftops
  • Outdoors
  • Sinks
  • Indoor Wet locations
  • Locker Rooms
  • Garages
  • Crawlspaces (lighting outlets)
  • Unfinished portions of basements
  • Boat hoist
  • Dishwasher

USB Outlet

USB Electrical OutletLiving in the smart age where USB plugs are everything, it only makes sense to install a USB outlet. The integrated electrical outlet is very convenient and easy to install!

You can find a combination outlet of USB and regular outlet receptacles or an outlet with only USB ports.

If you don’t want to do any electrical work, you could always purchase a USB wall charger, but it might be more convenient in the long run to install the USB wall outlet.

Smart Outlet

Smart Electrical OutletSpeaking of smart products, a smart outlet is one of the most convenient and high-tech options! A smart outlet is just like a regular outlet, but you can control it using your smartphone or other smart devices!

The smart outlet is highly convenient because it can be turned on or off from just about anywhere! Installing these outlets will also require you to upgrade your home with a smart home hub, but it will be worth it!

A smart outlet can connect to WiFi or Z-Wave devices to help control the outlets depending on which version of the outlet you purchase. This WiFi outlet is a perfect replacement for normal outlets because it connects with other smart devices and can be controlled on the main network.

Light Switch & Electrical Outlet Combo

Light Switch Electrical OutletLight switch outlets are nice to have when you are trying to control the power of an outlet by turning it on and off at your convenience.

The light switch outlet normally is a combination of a light switch and a single outlet that can be turned on and off. This is nice to have because you can leave something plugged into the outlet at all times, but it won’t be using power when turned off.

Some people also use these outlet combinations to plug in extension cords to help control power output.

There are a lot of different electrical outlets that you can choose from, so make sure you are buying one that has the amperage, voltage, and protection you need!

 

Watt do you think?

Which outlets do you think are the best in your home? What about for your business?

Make sure to let us know in the comments below, and don’t forget to connect with us on Facebook and Twitter!

 

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Receptacle outlet duplex

What Is a Two-Duplex Outlet?

While standard duplex outlets feature two outlets on a cover plate held on by one screw, two-duplex outlets feature four outlets on the same cover plate, held on by two screws. This configuration allows for up to four oversized plugs in close proximity.

Two-duplex outlets are also referred to as quad outlets or four-plug outlets.

Why Do I Need a 2 Duplex Outlet?

Having a quad outlet installed offers you the convenience of four outlets in one spot. This allows you to plug in more devices at a time in one area of your home.

The two-duplex outlets are used in areas such as:

  • Home Offices
    Home offices are dense with electrical devices – computers, printers, routers, phone chargers, and more – making outlet space precious. Installing two-duplex outlets is a simple, convenient solution without power strips and wires getting in the way.
  • Entertainment Centers
    Televisions, sound systems, video game consoles, streaming devices, and more all compete for outlets in your living area. For flat screen televisions, a recessed quad outlet is a great all-around solution.
  • Aquariums
    Plug heaters, filters, lighting, and more into a single four-plug outlet. GFCI outlets are also a must for safety.

Installation of Two-Duplex Outlets

There are two ways to wire in two-duplex outlets:

  • Split Duplex or Split Wired Receptacle
    With this type of installation, two separate receptacles are installed in one location; this configuration is called a double gang box. Each receptacle has its own power source and is wired into a separate breaker. This type of wiring allows heavier use of electricity for areas such as the kitchen where larger appliances may overload the circuit. For this type of installation, however, the correct wiring must be in place, or it will have to be added to your home and electrical box.
  • Quad Receptacle
    This method wires one four-plug receptacle into a single gang box, replacing a single-duplex outlet. You will need a bit more clearance with quad receptacles, as they do not mount flush to the wall. You should also check with your electrician to ensure that this type of installation will be sufficient for the appliances you plan to plug into this receptacle, as it is not made for the heavier use of a split-wired receptacle.

Proper installation is key for your two-duplex outlets. For expert two-duplex outlet installation, contact the professionals at your local Mr. Electric®. Schedule an appointment online or call us at (844) 866-1367 today.

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How To Split Wire an Outlet or Receptacle - Two Circuits on One Outlet (Duplex Receptacle)

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