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Posted by Just Joshin on March 21, 2007, 1:22 pm
On Tue, 20 Mar 2007 16:11:34 -0500, gfretwell@aol.com wrote:
>wrote:
>
>>
>>>I have a two story house with an attic. The attic has a bare bulb
>>>utility light that is wired using EMT metal conduit. The conduit rises
>>>about three feet above the attic insulation. The conduit runs straight
>>>down through a wall to an outlet box on the second floor. I have
>>>noticed water in the outlet box in the winter (Midwest). Warm moist
>>>air is going up the conduit, condensing in the cold of the attic and
>>>running back down to the outlet box. The conduit and metal box are
>>>rusting along with the potential problem of shorts from the water. I
>>>have tried to stop the air infiltration by using foam cutouts behind
>>>the outlet cover. This has helped some but does not stop it
>>>completely. I want to know if it is safe to caulk the conduit openings
>>>either at the second floor end or the attic end. I worry that blocking
>>>the second floor end might be trapping moisture in the conduit. Will
>>>blocking the attic end cause heat buildup? Can another material be
>>>used instead of caulk, like fiberglass? What does the electric code
>>>say about this situation.
>>
>>imho:
>>
>>"Duct Seal" migth be your friend. ;) If you use it, use it on the
>>end of the conduit inside the home. This way it doen't over heat,
>>summer time, or shrink, winter time, too much.
>>
>>Just a guess....
>>
>>tom @ www.YourFunnyCaptions.com
>>
>>
>>
>
>
>Heat is not really an issue. The computations in 310.16 do not expect
>the conduit to "breathe". It will still radiate heat but even that is
>not in the computation.
I was referring to attic heat in the summer. So use it on the climate
controled side.
Just guessing....
tom @ www.MedJobSite.com
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