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In our house's master bedroom, we have an interesting setup.
We have a kill switch to cut power to the room due to my Dad's EMF concerns. (Nothing unusual going on with the EMF, just health concerns.)
We have a couple of lights in there: a wall sconce powered by a single-pole switch, and a tape light yet to be installed, powered by a separate light switch.
Everything functioned properly until two days ago.
I was at the hardware store, and I get a call from my brother, who says that that he heard a buzzing sound when he tried to turn the light on in there. He said the light wouldn't go on, and that he heard a buzzing sound that stopped. The breaker was tripped.
I inspected all the light switches in the room, and everything looked OK. no sign of arcing, or anything. (like the melted outlet downstairs...)
So I went upstairs armed with a Class C fire extinguisher, had my brother downstairs flip the breaker. and cautiously tested everything.
There was not a sound to be heard. The only thing I noticed out of the ordinary, was that the wall sconce flickers when we first turn it on. it is a LED fixture.
I can give more information, and post pictures as needed. We have been renovating the master bathroom.
There is one change I made to the master bedroom wiring. The reasons are kind of complex and deserve a separate post, but I disconnected an unused wire and nutted the hot and neutral together. There is no power in that line anymore, and the breaker doesn't trip. I inspected the nut, and there are no signs of melting (again, like downstairs...) and the wires showed no sign of arcing. So I am pretty sure that is not the problem.
I turned the breaker back off, just to be safe.

Thanks in advance for any advice.
I am thinking it may be a defective switch.
Johnpaul
 
TL;DR
There was a buzzing sound reported in an upstairs bedroom.
I was unable to replicate it, but I did notice that one sconce flickers an unusual amount when first turned on.
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