Wiring Diagrams for Double Gang Boxes

–Check local regulations for restrictions and permit requirements before beginning electrical work– The user of this information is responsible for following all applicable regulations and best practices when performing electrical work. If the user is unable to perform electrical work themselves, a qualified electrician should be consulted.

This page contains wiring diagrams for two outlets in one box. Included are arrangements for 2 receptacles in one box, a switch and receptacle outlet in one box, and 2 switches in the same box.

Wiring Two Outlets in One Box

wiring two outlets in one box using pigtail splices

In this diagram, two duplex receptacle outlets in the same box are wired separately using pigtails spliced to connect the terminals of each to the source wires. With each outlet connected with its own wire, if one fails the other will still work.

Wiring Dual Outlets in a Series

wiring diagram for dual outlets in a series using terminal connections

Here two outlets in one box are wired using the device terminals to connect them. With this arrangement, if receptacle #1 fails, receptacle #2 may also fail if failure is due to physical damage. However, if the copper tab conductors between the terminals remain intact, even if #1 stops functioning, outlet #2 will most likely still work.

Wiring 2 Outlets with 2 Sources

wiring for two outlets in one box with split 240 volt source

In this diagram, two receptacle outlets are wired in the same box with a separate 120 volt source feeding each. Three-wire cable runs into the box. The black and red wires are hot and each is connected to one of the receptacles. The white, neutral wire is splice to each outlet so they share the return path. This is appropriate for standard duplex receptacles, but should not be used for GFCI receptacles. GFCI's must have dedicated neutral connections to work properly. A circuit like this is can usually be found in a kitchen where two 20 amp circuits are required as illustrated in this circuit breaker diagram.

Wiring Two Switches in One Box

wiring for 2 switches in 1 box and 2 lights

In this arrangement with 2 switches in one box, the bottom terminals are connected with pigtails spliced to the source. The top switch terminals connect to the black wires running to the light fixtures. The source neutral and ground wires are spliced to run to each light fixture box.

Wiring Two Switches in One Box with 2 Sources

wiring diagram for two switches in one box with 2 sources

This diagram shows two switches in the same box with a separate 120 volt source feeding each. Three-wire cable is supplying the source for the switches with the black and red wires each connecting to the bottom terminal of a switch. The black wire from each light is connected to the top terminal of their respective switch. The white and ground wires are spliced to run to each light fixture.

Wiring a Switch and Outlet in the Same Box

wiring for a light switch and outlet in the 1 box

In this diagram, a light switch and receptacle are wired in the same box. Both devices are spliced to the same hot source and the neutral is spliced to the neutral terminal on the receptacle and to the white wire running through to the neutral at the light fixture located in a separate box.

Wiring an Outlet and a Light Switch Mid-Circuit

wiring a switch and outlet in same box in the middle of the circuit

This diagram illustrates a switch and receptacle in the same outlet box located in the middle of the circuit. This wiring allows the electricity to continue from the receptacle, on to any other outlets in the circuit and it provides a switch to control a light fixture or other load, such as another receptacle or a fan.

Wiring a Switch to an Outlet in One Box

wiring a switched outlet in one box

In this diagram, a switch and receptacle outlet are in the same box and the switch controls the power to the outlet. The hot wire connects to the bottom terminal on the switch and the top output goes to the hot terminal on the receptacle. The neutral wire from the source connects directly to the outlet neutral.

–In these wiring diagrams, the brass colored terminals represent the hot side of the device and the silver colored terminals represent the neutral side. Ground wires and terminals are in green, including a green dot representing the builtin grounding terminal found in most metal outlet boxes.

–By code, the number of conductors allowed in a box are limited depending on box size. Conductors include wires, devices like switches and receptacles, and some other metal parts. Check here to calculate the number of conductors allowed in a box before adding new wiring, etc.