Put a GFCI in an outlet in a wet bar and decided to put the rest of the circuit (largely lighting) on the load side of the circuit interrupter. A light that was 3-way switched on the load side of the GFCI would trip every time either switch was turned on.
It's a 15 A circuit and runs 14/2 throughout. There is no evidence of the use of 14/3 in the 3-way lighting circuit. I'd never seen a 3-way lighting circuit wired without three conductor wiring (14/3). The load appears to be at the end of the cable run with the two switches preceding it in the run.
Anybody know what I'm looking at here and how it might have been wired? Also, would this alone cause the GFCI to trip when the circuit was energized.
Another odd thing about this circuit is that the neutral wire of the3-way lighting circuit on the second switch has been "gathered" together with neutral wires of another circuit serving a single-pole switch in the same two-gang box as the second switch. Could this be causing the GFCI to trip too?
Is this a dangerous setup and, if so, why is it dangerous?
I'd read some of the other groups and ran across mention of something called a California or coast/coastal/coasted wiring setup for 3-ways. Anybody know what that is? Some of what I read suggested that a "coasted" wiring of a 3-way switch would be the way that two conductor wire (14/2) could be used in a 3-way circuit. But what I read suggested that this was illegal (forbidden by the code) as it switched the neutral wire. I also read that this was "a good way to get someone killed" but I don't know why.
Can anyone point me in the right direction?