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Old 03-17-2008, 10:10 AM   #1
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Could this be a fire hazzard?


Hi! This is my first post!

My wife and I are redoing our bathroom. In order to move the light fixture from the wall to the ceiling I had to crawl up in the attic and rerout the electrical wire to gain a few more inches. The only way I could do this was by running the electrical wire underneath the main air conditioning duct (a large rectangular piece of metal). In one spot it is pinned between the duct and a 2x4.

The metal is very light weight so I don't think there is any chance the weight could damage the wiring, but I am a little concerned about heat. In the summer the attic could easily get up to 150 F and metal of course tends to get pretty hot. I think it should be fine because the duct will not be in direct sunlight, so it shouldn't get much hotter than the attic temperature, and during the hot months the AC will be blowing cool air through the duct.

The other concern is during the winter. But I am sure the hot air running through the duct couldn't get hot enough to melt the wire (could it?).

The wire is copper and it is heavily insulated. The house was built in the mid seventies. Not sure what other details might be helpful. Thanks a ton in advance to anyone who replies!

P.S. I know this is probably a silly question but I just want to make sure I am doing everything I can to keep my family safe. Thanks again!

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Old 03-17-2008, 10:15 AM   #2
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Could this be a fire hazzard?


If you are saying the wire is pinched by the duct and the 2x4 then you need to make a change. Drill a hole through the 2x4.
Temperature would not be a concern.

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Old 03-17-2008, 10:21 AM   #3
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Could this be a fire hazzard?


If the 2x4 is any part of a truss it cannot be drilled.
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Old 03-17-2008, 10:24 AM   #4
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Could this be a fire hazzard?


The duct is on top of the wire, but pinched might be a strong word. There isn't much holding the duct down, so it's not like I had to use something to pry the duct up to fit the wire under it. If weight is an issue I could figure out a way to get the weight off of it. The 2x4 is part of the truss.

How much weight can safely rest on electrical wiring?

Last edited by Mr_E; 03-17-2008 at 10:40 AM.
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Old 03-17-2008, 11:33 AM   #5
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Could this be a fire hazzard?


Quote:
Originally Posted by Mr_E View Post
How much weight can safely rest on electrical wiring?
Not much.
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Answers based on the 2008 & 2011 NEC.
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Old 03-17-2008, 11:47 AM   #6
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Could this be a fire hazzard?


Sounds like I better do something about that then. Thanks everybody for you help!
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Old 03-17-2008, 02:55 PM   #7
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Could this be a fire hazzard?


Sleeve the cable in a short piece of conduit or istall a running board on either side to keep the duct from rubbing on it. The rubbing could over time wear through the cable.
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Old 03-17-2008, 02:58 PM   #8
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Could this be a fire hazzard?


That is right a long the lines of what I was thinking. That's what I think I will do. Thanks for the advice!

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