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How do I install a GFCI receptacle with 2 black and 3 white wires plus a ground? I have two such regular receptacles next to sinks and should replace them before the upcoming home inspection, please help. The instruction sheet for Leviton "smartlockpro" receptacle says: "do not install the GFCI receptacle in a electrical box containing (a) more than 4 wires (b) cables with more than 2 wires; contact a qualified electrician if either (a) or (b) are true"

edit> This is an existing home built in the 70s. The bathroom light appears to be the 3rd white wire. To top things off the 3rd wire seems to be on a different breaker as it becomes energized and lights up the power sensor after both blacks are switched off but not before shutting off the breaker.

  • Are you installing a receptacle in a new location, or replacing an existing device? – Tester101 Aug 20 '14 at 9:49
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    Some photos would be helpful. – Tester101 Aug 20 '14 at 9:50
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    It would help to know how it was wired to start with, and where the cables go. – Brad Gilbert Aug 20 '14 at 13:57
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    3 whites and 2 blacks does not make sense in a normal outlet application. Is half the outlet switched? And add another request for nice clear pictures showing the wiring as it is. – Ecnerwal Aug 20 '14 at 16:08
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    You should contact an Electrician. Your wiring seems suspect, and potentially dangerous. – Tester101 Aug 21 '14 at 11:27

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