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I am switching my kitchen receptacle to a GFI; it has 3 wires. I'm pretty sure I have to break the bar between the two hot screws, thus making the top and bottom on a separate circuit. What is the reason for this way of wiring? The outlet is not feeding anything else, it's on its own circuit with a double pole 15amp breaker. Seems a little useless to me. The house was built in 1978.

Niall C.
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user15099
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    It sounds like you're describing a multi wire branch circuit. You cannot connect a normal GFCI receptacle as you're describing because you'll effectively have a shared neutral with one of the hots on the gfci. See [How do I install a GFCI receptacle with two hot wires and common neutral?](http://diy.stackexchange.com/questions/9293/how-do-i-install-a-gfci-receptacle-with-two-hot-wires-and-common-neutral) and [Is this a “shared neutral” situation?](http://diy.stackexchange.com/q/16693/2196) – BMitch Sep 15 '13 at 00:23
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    What are the colors of the three wires? Do you know if the same circuit breaker currently controls both the upper and lower outlets? – bib Sep 15 '13 at 00:29
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    This almost sounds like the outlet under a kitchen sink, where there is a single duplex receptacle with one circuit for a dishwasher and a second circuit for a garbage disposal. – Stefan Lasiewski Sep 15 '13 at 00:55

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