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 PVC electrical conduits
Author: sum (FL)

I have a question about those SCH80 gray color electrical conduits that are used a lot down here in south Florida for outdoor wiring and indoor below grade wiring.

There has been dozens of times to pull new THHN conductors through them which sometimes require me to pull a fish tape in then repull all of them back. Each and every time I pulled out old conductors they are wet. This means water got inside these conduits.

I know it rains a lot down here and water table is high and the conduits may be submerged.
I don't expect a PVC water line to leak. But for PVC conduits even the pros told me its not uncommon for them to be wet inside. Why? PVC is PVC and its solvent welded why would it leak that much more frequently?

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 Re: PVC electrical conduits
Author: packy (MA)

they were not installed properly.
we have to pressure test our piping and electricians should be required as well.
(underground is what i mean)..

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 Re: PVC electrical conduits
Author: stuckinlodi (MO)

Even if things are sealed up fairly tight there is always some path for air to leak inside the conduit and that air contains moisture, so you can get condensation inside the conduit when there are temperature changes. Over time that condensation accumulates since it doesn't have a place to drain off and it doesn't evaporate due to being confined. Sort of like getting condensation in a gas tank on a car. I suppose if the water accumulation was too large or a concern you could add a drip leg off a tee in the above-ground conduit at a low point. Or drill a couple of small holes in the pvc on the bottom side so water would drip out.

Edited 4 times.

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 Re: PVC electrical conduits
Author: PlumberLoren (CA)

Be careful drilling holes in the bottom, you could damage the wiring and it will allow a path for water to enter the conduit. You may want to reconsider drilling holes.

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