- Metal single gang device box
- A cable clamp.
- A Ground-Fault Circuit Interrupting (GFCI) receptacle.
- A cover plate.
NOTE: If the cord is going to be used outdoors; or in other damp or wet locations, use a weatherproof box, clamp, and in-use cover.
- Punch out one of the knockouts in the electrical box.
- Install the cable clamp in the hole you just created.
- Strip about 6" of the outer outer jacket from the cable.
- Fit the cord through the clamp so that about 1/2" of the outer jacket is inside the box, then tighten down the clamp.
- Strip about 3/4" of insulation from the end of each wire.
- Connect the ungrounded (hot) conductor of the cord, to the brass colored screw labeled LINE on the receptacle.
- Connect the grounded (neutral) conductor of the cord, to the silver colored screw labeled LINE on the receptacle.
- Install the receptacle in the box.
- Install the cover plate.
Testing and use
- Plug the extension cord into a working receptacle.
- Press the RESET button on the GFCI receptacle.
- Use a receptacle tester or lamp to verify the GFCI receptacle is working.
- Press the TEST button on the GFCI receptacle.
- Verify the GFCI receptacle has lost power.
- Press the RESET button again, and verify power is restored.
- Use the cord.
NOTE: This procedure should be followed each time the cord is used, to insure the GFCI receptacle is functioning properly.
Or, simply buy a new cord end for a dollar or two.