ECN Forum Forums Code Related Discussion NEC & other Code issues Rain Tight EMT connectors.

I'm not convinced that condensation would be an issue with conduit tight to a soffit, Roger. Condensation usually occurs with varying temperatures inside and outside the pipe. IMO the temperature would change gradually and equally.

Why drain a dry pipe? As an added precaution.

I'm in agreement with you that the wording is a little strange, but who reads the NEC without getting used to that?

Dave

Dave, how can an installation be arrainged to drain if it's raintight?

The new fittings are supposed to be absolutely water tight, yet the wording of 225.22 tells us to provided an opening in the raceway.

Whether it's due to condensation, water pressure, or flooding, the point is, there will be moisture in the raceway and the NEC recognizes it, this is why we use "W" type conductors.


Roger

[This message has been edited by Roger (edited 08-27-2005).]

I take the phrase "arrange to drain" to mean that you have one end of the pipe lower than the other as a plumber would with a horizontal run of drain pipe. Everything we use outside can get wet inside, so it needs to drain. That doesn't mean that we want it filling up with water like a plumbers drain, as I guess it was with the old type fittings. I was stating in my earlier post that I might not consider all locations outside to be wet locations.

Looking from another perspective, those old fittings were also letting the water drain back out. As you say, the only real safeguard is that the insulation is rated for a wet location.

Dave