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Posted on Oct 24, 2010

How do you wire a GFCI light switch and outlet combination? There are 2 black wires coming out directly from the back of the switch side.

1 Answer

A

Anonymous

If I understand correctly, you are replacing a single switch that has two wires.
You want to install a switch/plug-gfci similar to one shown below.

You are working on wires inside a box:
To wire this kind of device you need at least 2 cables entering the box.
Each cable has a black-white-ground wire.
Cable 1) One cable comes from breaker box. This is the Hot cable
Hot cable has black-hot-from-breaker & white-neutral-from-breaker

Cable 2) One cable goes to the Load (light, fan motor). This wire is controlled by the switch. This is the Load cable
Load cable has black-to-load & white-to-load.

how do you wire a GFCI light switch and outlet - 3426bd4.jpg

Leviton combo GFCI and Switch
There are 2 screws on either side of switch
There are 2 screws to either side of plug
There are two wires on back of device

2 screws on either side of switch: there is a brass-colored screw and silver-colored screw.
Black-hot-from-breaker connects to brass colored screw on side of switch
White-neutral-from-breaker connects to silver colored screw on side of switch

2 black wires on back of device
Black-to-load connects to black wire on same side of switch as brass-colored screws
White-to-load connects to black wire on same side of switch as silver-colored screws

2 screws on either side of plug
These screws are used when your box is a 'junction' box that feeds wires forward to another box ... for example you have 4 receptacles in a room, the cable enters first box and then goes to the next box and to the next box. Suppose your switch was one of the boxes. Wire arrives from a previous box (this is the Hot cable, every box has 1 Hot cable). Your switch box sends one cable to the Load (light, fan etc), but it also sends another cable to the next box which has a receptacle or another switch.
If your box has a third cable that feeds forward to other boxes, then the screws on either side of plug are used. The black-to-next-box goes to brass screw. The white-to-next-box connects to silver screw.
And all further boxes and devices are protected by the GFCI device.

If you need more information, please answer back and I will help.

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I've copied instructions from an Amazon review.
worse than worthless and border on dangerous. Be forewarned, and allow some time to install it correctly; and don't expect any help from the included paperwork.

IMPORTANT THINGS TO KNOW:

- There is no ON/OFF indicated on the switch or the instructions, so there is no way to know which direction is on or off. The picture included is upside down, and shown in the OFF position. If you install it with the switch on top, it will work intuitively with the switch up for ON and down for OFF. (Should be common sense, but doesn't say it anywhere, and the text on the device and photo suggests otherwise.)

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http://waterheatertimer.org/pdf/Leviton-8299-instruction-manual.pdf

You don't say what kind of device you are replacing.
Instructions below may be way off base if you are trying to replace a 3-way switch.
Instructions below are for replacing a switch-plug combo.
Add a comment any time, and clarify your device your are replacing.

Electricians don't guess, they test.
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Note where each wire was connected to old device before removal.
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The screw color is coded, and will verify testing.

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Neutral wire connects to silver colored LINE screw.
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Next we want to wire the switch.
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Again referring to back of device as reference point, black wire going to Load connects to wire on left side. White wire going to Load connects to wire on right side.
Now turn on power and test that switch and receptacle both operate as expected.
If operation is not correct, then add a comment and say what the second black and white wires connect to.

geno_3245_193.jpg
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