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Replace old receptacle/switch combination with a GFCI/switch combination

Home Improvement Asked by SSG on January 6, 2021

I’d like to replace an old receptacle/switch combination with a new GFCI/switch combination. The old outlet was always hot, and the switch controlled power to a second (outdoor) receptacle. I need that outdoor receptacle to be protected by the new GFCI.

There are only three wires in the gang box:

  1. Black wire – was connected to the old Outlet/Switch on a screw labeled "Common".
  2. Red wire – connected on the opposite side of the black wire, on the top (switch) half.
  3. White wire – connected on the opposite side of the black wire, on the bottom (outlet) half.

With only these three wires, can I replace this old receptacle/switch combination with a "Leviton GFSW1-W Self-Test SmartlockPro Slim GFCI Combination Switch Tamper-Resistant Receptacle"?

If yes, how would it be wired?

One Answer

Given the wire topology you have there, it ain't gonna happen.

There is no way to protect another recep with only 3 wires coming into the box. You need a minimum of 4: unprotected supply Hot and Neutral, and protected-zone Hot and Neutral.

You can install that GFCI+recep+switch combo, but you won't be able to use the LOAD terminals for anything, and the only socket that will be protected will be the one right there.

Correct answer by Harper - Reinstate Monica on January 6, 2021

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