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Posted: 1/24/2009 9:40:14 AM EDT
I've had a light fixture in my bathroom closet that's never worked since I moved into this house about 7 years ago.  Finally got around to pulling the fixture down to try to fix it and the fixture is corroded inside, and there was water in it.  I went up into the attic but there are no areas where it's leaking.  I was looking up into the electrical box in the ceiling and saw a drip of water come out of the conduit that terminates in the box that the fixture is mounted to.  I'm assuming that the water is just from condensation; the conduit doesn't run to any outside fixtures, and there just doesn't appear to be any other way the water could be getting in there.  

I can put a new light fixture on and hook it up, but I don't want this one to get ruined like the last one appears to have been.  Any ideas for keeping this from happening again?
Link Posted: 1/24/2009 9:51:03 PM EDT
Link Posted: 1/24/2009 10:49:08 PM EDT
It can happen where condensation can build up in a conduit that goes through different temperatures.    If it goes from a bathroom with high humidity, through a cold attic, it  is even more possible.    NEC 300.7(A)  says that this can be sealed if this is the case. AND if you would consider the cold attic to be "exterior"

If this is in a residence, any reason why not just use romex to your light?
Link Posted: 1/26/2009 1:08:17 PM EDT
NEC 300.7(A)  says that this can be sealed if this is the case. AND if you would consider the cold attic to be "exterior"

"exterior" has nothing to do with it at least up to 2005 (2008 at work).

Blocking conduit to limit condensation is fine.

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