ceiling light wiring affecting light in another room

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johnm

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I have just replaced the ceiling light after a replastering job. It worked well until I have been told that when it is switched on the ceiling light in the next bedroom goes off. Help!!!!!
 

kok328

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You've obviously done more than just change out the fixture. How invasive was the plaster job? The more detail on this one the quicker we can get you straightened out and have a safe home.
 

gfw

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Is it possible you've inadverdently created the effect of a pair of three-way switches, but with the lights on two different paths instead of on the same path which is what you'd do if you were *trying* to make two lights controlled by a pair of three-way switches.

My idea only makes sense if it's not something more dangerous - like a ground fault.

Like KOK328 said, we need more details - is any breaker tripping, or can you walk back and forth repeatedly turning one light on (but causing the other to turn off). Any noises or smells would be an important (and bad) sign.
 

gfw

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Following up on my own post, a person could indeed deliberately wire mutually exclusive lights using two 3-way switches, but not without trying :)

If you only replaced the light, and you know which wire is ground, then that couldn't happen. If you also had the switches off the wall and reconnected them incorrectly, then bets are off.

How to wire a 3-way switch
 

triple D

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If so then you have what is called a switch loop. This is where you have a power in and out of a light, thats two wires, and a wire that goes to a switch. Generally a white wire in the light box is tied to the two black powers, and goes to switch, and comes back on the black wire to be hooked to light. The other two whites are neutrals and hook together with white from light fixt. If any of this makes sense you could pull down light and have a look. Then if its greek you could tell us what you see in there then we could surely help ya out. Good luck.....
 

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