Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 03-13-2010, 07:47 PM   #1
Newbie
 
Join Date: Sep 2007
Posts: 9
Share |
Question

Water in conduit MYSTERY


Hi all,

For quite some time I've been noticing what appeared to be water marks around a switch box on a second floor interior hallway wall. At first they were fairly light, so much so I thought it might just be some strange drywall discoloring. Lately it has gotten much worse and I originally thought it might be some leakage from the attic fan on the roof but after going into the attic to investigate, there was no leakage coming from the roof. That was a week ago.

By chance, I happened to be installing a whole house fan this weekend and had to move the electrical in the attic so I had to cut into some conduit to relocate the wiring. When I cut into one of the conduits going to that switch box, I saw black/rust water come out onto the floor of the attic. The inside was all wet.

One end of this conduit terminates at that switch box and the other end at the opposite wall in an outlet. That wall has the garage on the other end.

I took out a 5-6 foot section between the wet part where the conduit turns to go down into the interior hall wall and the part that goes to the other wall. I didn't see any signs of water at the other end I cut closer to the other wall. This seems to be collecting toward the inside wall end.

That piece conduit has no openings or unions near that wall. The closest union was on the other end where I didn't see any water.

Does anyone have any ideas on how this is happening?

I'm including pictures for anyone willing to make a guess. I see a big rust spot on the floor of the box under the second to the right however, the conduit on the far left is the one with the water - you can even see water sitting on the wire nut (pictured).

By the way, there is no evidence of leakage from the roof anywhere. The water just seems to magically appear in that part of the conduit. What gives??

Water Spots:

Water in conduit:

Showing proximity to wall entry:

This is the other end closer to the other wall about 5 feet away from the water. This is the closest opening in the conduit until it gets to the switch box in the wall. If water was seeping in at this point I would think I would see some evidence here:


Here's a wide shot showing both ends:

The opened wall:

Water in the nut on the far left:

feign3 is offline   Reply With Quote
Old 03-13-2010, 07:55 PM   #2
Electrical Contractor
 
kbsparky's Avatar
 
Join Date: Sep 2008
Location: Delmarva
Posts: 3,368
Default

Water in conduit MYSTERY


It's called condensation.

What you have here is a cold area (attic) and a warm area (living space) with a continuous metal conduit running between them.

Warm, moist air is entering the conduit inside of your switch box, and then rises up to the cold attic where it condenses out as water. This water then drips back down the conduit, and settles in the junction box, fills up wirenuts, etc.

The cure here would be to clean out the ends of those conduits as best you can, and then seal them up with putty, caulk, or expanding spray foam. This will prevent the air flow and heat exchange from occurring -- and as a result -- the collection of moisture and water in your box.

__________________
-KB

Life is uncertain -- eat dessert first!!
kbsparky is offline   Reply With Quote
Old 03-13-2010, 09:23 PM   #3
nap
You talking to me?
 
nap's Avatar
 
Join Date: Dec 2007
Location: sw mi
Posts: 5,407
Default

Water in conduit MYSTERY


Quote:
Originally Posted by kbsparky View Post

The cure here would be to clean out the ends of those conduits as best you can, and then seal them up with putty, caulk, or expanding spray foam. This will prevent the air flow and heat exchange from occurring -- and as a result -- the collection of moisture and water in your box.
and on top of this, it is required by code to seal a conduit that runs from different temperature areas just so as to prevent this.

I use duct seal. It is removable if needed and prevents the airflow that causes the problem you are experiencing.
nap is offline   Reply With Quote
Old 03-13-2010, 10:45 PM   #4
" Euro " electrician
 
frenchelectrican's Avatar
 
Join Date: Apr 2006
Location: WI & France { in France for now }
Posts: 5,369
Default

Water in conduit MYSTERY


Both guys hit the nail.,,

C'est a condestaion and how thick the attic insluationg is on now and it should cover the conduits good otherwise get a duct seal to prevent air flowage that what happing with the conduit with diffince on tempture there.

Merci,Marc
frenchelectrican is offline   Reply With Quote
Old 03-14-2010, 08:17 AM   #5
Member
 
Join Date: Nov 2007
Location: Nashua, NH, USA
Posts: 6,946
Default

Water in conduit MYSTERY


You will want to dry out the full length of the inside of that conduit before sealing it up. You'll have to rig up someting, for example let as much loose water drip out first and connect up a vacuum cleaner hose using duct tape. (Specifically a vacuum cleaner connection must have some air leaking in from the side as well to avoid overload. As it is uncertain how long it will take, you will have to err way on the long side (sev3eral hours). Feel at the other end of the conduit to be sure that air is flowing through.
__________________
Stop wasting time re-adjusting the pattern. Have several lawn sprinklers, one for each pattern.
AllanJ is offline   Reply With Quote
Reply

Tags
conduit, water


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Which Gas Hot Water Heater walds11 Plumbing 66 01-16-2010 07:38 AM
water pouring into basement from around water supply line matty8199 Building & Construction 29 12-29-2009 05:07 PM
low hot water pressure angus242 Plumbing 10 01-08-2009 11:41 AM
Tankless or tank, but not both gp_wa Electrical 43 10-15-2008 10:08 PM
water in my conduit Unregistered Electrical 1 01-20-2004 08:12 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.