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Old 05-18-2010, 05:48 PM   #16
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I guess it's easy enough to check

In split phase house wiring, for example, a duplex receptacle in a kitchen is typically connected with a cable that has three conductors, in addition to ground. The three conductors are usually colored red, black, and white. The white serves as a common neutral, while the red and black each feed, separately, the top and bottom hot sides of the receptacle. Typically such receptacles are supplied from a ganged breaker, i.e. a breaker in which the handles are tied together for a common trip, so that if one kitchen appliance malfunctions and pops the breaker, the other side of the duplex receptacle will be shut off as well. This is called a multiwire circuit.

Last edited by Yoyizit; 05-18-2010 at 05:53 PM.
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Old 05-18-2010, 05:49 PM   #17
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Originally Posted by Yoyizit View Post
If the candles are on first and then the cab lights go on does the GFCI trip?
This, to me, is further proof that the OP is dealing with a MWBC. When there's a load on the other wire (of the MWBC) the GFCI will not trip. I'm speaking of personal experience. Before there were Multi-wire GFCIs. I installed a GFI breaker on one leg of such a circuit. Whenever there was a load (albeit small as a radio clock), the GFI did not trip, in testing mode.!
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