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Electrical Inspections Contains discussions about electrical systems. This includes receptacles, panels, wiring, etc.

 
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  #1  
Old 5/17/07, 12:17 PM
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Default Guess what causes this
Here's a trick question for some folks. Guess what caused the burn marks on this switch. I know, and I'll post the other picture later. There were several other switches mounted like this with similiar marks.

It stumped me until I came across the last switch.
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  #2  
Old 5/17/07, 12:28 PM
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Default Re: Guess what causes this
Was there a "dimmer" on the last switch?
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  #3  
Old 5/17/07, 12:32 PM
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Default Re: Guess what causes this
Quote:
Originally Posted by tmantsch
Was there a "dimmer" on the last switch?
Nope...

Hint: the box itself is plastic.
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  #4  
Old 5/17/07, 1:21 PM
jking2 jking2 is offline
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Default Re: Guess what causes this
Lightning!

Jim King
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  #5  
Old 5/17/07, 1:23 PM
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Default Re: Guess what causes this
Cigarette butt? or perhaps some other open flame rested on top of the box - candle?
Last edited by Rick Maday; 5/17/07 at 1:48 PM..
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  #6  
Old 5/17/07, 1:34 PM
cwillick1 cwillick1 is offline
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Default Re: Guess what causes this
open neutral
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  #7  
Old 5/17/07, 1:37 PM
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Default Re: Guess what causes this
I'll take a guess...

conduit used as ground

interruption of ground continuity by plastic boxes
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  #8  
Old 5/17/07, 1:47 PM
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Default Re: Guess what causes this
Quote:
Originally Posted by Rick Maday
Cigarette butt?
That's it.
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  #9  
Old 5/17/07, 2:18 PM
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Michael Larson Michael Larson is offline
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Default Re: Guess what causes this
Quote:
Originally Posted by bdoles2
Here's a trick question for some folks. Guess what caused the burn marks on this switch. I know, and I'll post the other picture later. There were several other switches mounted like this with similiar marks.

It stumped me until I came across the last switch.
What's going on with the paint behind the EMT in pic 1?
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  #10  
Old 5/17/07, 2:25 PM
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Default Re: Guess what causes this
Quote:
Originally Posted by mlarson
What's going on with the paint behind the EMT in pic 1?
Flat paint rolled over a gloss. Crappy paintjob that's all.
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  #11  
Old 5/17/07, 2:27 PM
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Michael Larson Michael Larson is offline
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Default Re: Guess what causes this
Quote:
Originally Posted by bdoles2
Flat paint rolled over a gloss. Crappy paintjob that's all.
Faked me out. Looked like paint blistering from heat. Darn web photos.
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