Originally Posted by
John K Jordan
Electricians have mentioned every underground conduit somehow gets full of water, no matter how well the conduit joints are sealed. Apparently water hurts nothing. The conduit is for protecting the insulation from physical damage.
Any underground is a wet location. The water does not come from the soil or joints, but from the air.
The temp, 18”, 24” whatever below grade is different than above ground. Unless the conduit and the termination points of the conduit are exactly the same temperature, you have a convection current. May not be strong, but it is constant. The air is always changing.
Anytime that subterranean conduit temp is lower than the dew point of the above ground air, the water vapor condenses.
A hot humid day, you get a few drops of condensation. A few here, a couple there... after a few weeks, you have a wet location.
Last edited by Charlie Velasquez; 10-29-2020 at 9:17 AM.
Reason: clarity
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