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My out let has 2 black wires and 2 white wires and no ground. The out that I purchased has 2 black wires on the back I know where the white and black. Wires. Go from the wall. .**** what do I do with. The too black wires on the. Outlet itself (plug) thank you

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You purchased a GFCI outlet.
You posted under GFCI combo switch and receptacle.
If you have different device, then add a comment.

On back of device are markings that show Line and Load.
These markings are associated with screws on device.
Black Hot wire connects to Brass-colored Line screw.
White Neutral wire connects to silver screw located opposite Line screw.
If you don't know which wires are Hot and Neutral, the testing steps are shown at bottom.

Your other two wires evidently go to a light, fan, or motor that is operated by the switch.
This is where the two wires that stick out of GFCI device are used.
Your Black Load wire connects to one wire, and your White Load wire connects to other wire.

Finally there are 2 screws left on GFCI device.
These screws are used if the Hot and Neutral wires go forward to another switch or receptacle box. This would require another Black and White wire in the box, and all devices from the GFCI forward would be protected by the GFCI.
As you know, the way electric circuits work is a Black Hot and White Neutral leave the circuit breaker box and travel to a junction box. From the junction box, the Black Hot and White Neutral travel to the next box, and then the next box, and so on until the last box is reached. Each box contains a switch or plug or combo device or a light fixture. In your case, the Black Hot and White Neutral may not send power forward to another box, and may just be a switch box that has a single wire to the light fixture, and that is the end of the circuit.

How to test for Hot and Neutral wires:
Separate your 4 insulated wires.
Turn power ON.
Test each wire to bare ground wire.
Tester will light up on Hot wire.
Now Hot is Identified.
Test Hot wire to each other wire in box, except bare ground.
Tester lights up on Neutral wire.

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, fixya expert speaks to you via phone while you test the wires and wire the device.

Posted on Jan 04, 2011


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