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Condensation on Aluminum Junction Box 2

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nlowrie

Electrical
Oct 25, 2004
2
I am not very knowledgable on condensation and vapor pressure topics so hopefully someone can help.

We have an aluminum j-box mounted outdoors with a circuit board inside of it. It is in a seal-tite 1/2" conduit system. I am a bit concerned about condensation forming inside and am considering installing a small brass screen breather.

Anyone have experince with this? I need to understand this enough to convince others that allowing an air exchange will prevent condensation, rather than promoting it. Others are in the school of thought that we need to seal this box totally tight, but I know that moisture will get in no matter what. Without some sort of good explanation my superiors won't budge.

The way I understand it is that moist air will get and stay in the box, then condense when the outside air temp lowers. The breather would prevent this by allow the moist air to escape and/or equalize with outside rather than condense?
 
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I'm with jacksonm on this one -- if you have something relevant to add to an old thread, well by all means post away.
 
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