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Electrical Wire and Cable


Combo Switch and Outlet Wiring in Bathrooms

How to Identify the Electrical Wiring for a Combo Switch and Outlet: The sets of wires from two of the cables are spliced to each other which typically indicates that one cable is the power coming in.

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Basic Home Electrical Wiring by Example

Wiring a Combo Switch and Outlet
Electrical Question: I have a house built in 1963, but the bathroom has been remodeled sometime since then.

I would like to place two switches:

When I removed the old covers here is what I discovered:

What does the fourth one do?

The combo box has three sets of wires:

This electrical question came from: Eve, a Homeowner from Dallas, Texas.

Dave’s Reply:
Thanks for your electrical question Eve.
Eve, this is a very good question.

Bathroom Circuit Wiring for Combo Switch and Outlet

Task: Identifying the Electrical Wiring

You may notice that in the Switch Box with the Four Cables.

The other Switch Box with the Combo Outlet

If the power for the outlet is shared with the power for the light switch then you will see the black wires from these devices spliced together or you will notice that the metal tab that connects the two portions of the outlet and the switch together on the brass screw side of the combo outlet switch. However, the power source for the outlet and the switch may be from separate sources which would be noticeable by observing the wiring.

Please Note:
Wiring sources and connections as mentioned above are best identified by an experienced licensed electrical contractor who understands electrical wiring and how to use a voltage tester to positively identify the circuit wiring.

More about Bathroom Wiring

Bathroom Electrical Wiring

Residential Electrical Outlet Wiring
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Wiring Electrical Outlet for the Home

Home electrical wiring includes 110 volt outlets and 220 volt outlets and receptacles which are common place in every home.
See how wiring electrical outlets for the home are done.

How to Install Bathroom Electrical Wiring
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Bathroom Electrical Wiring

Fully Explained Photos and Wiring Diagrams for Bathroom Electrical Wiring with Code Requirements for most new or remodel projects.

For more information about Light Switch Wiring
Light Switch Wiring
Light Switch Wiring

Wiring a Light Switch – Diagram 1

Fully explained pictures and wiring diagrams about wiring light switches describing the most common switches starting with the photo diagram.


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Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all Electric Wiring Projects.

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