[TowerTalk] water in EMT conduit

[Patrick Greenlee]

Lets see if I followed the gist of the thread...

If a conduit with no water in it is hermetically sealed it will promote 
condensation.

Conduits should be left open so they can dry out.

Sealed conduits will breathe with changes in temp and barometric pressure 
and thus admit moisture.

...and so on and so forth...

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I'm still wondering how a conduit properly installed and sealed admits more 
and more moisture over time.    Ideas?  (Porosity of PVC increased by 
electromagnetic forces, intervention by space aliens, or what?)

I can't help going back to the question of how PVC pipe that can hold over 
100 PSI successfully without any leaks, when partially filled with cables, 
can't withstand changes in ambient pressure rarely reaching or exceeding 
5PSI. Max swings in barometric pressure from high pressure weather phenomena 
to lows of cyclones shouldn't exceed this level much if at all. Excluding 
critters and sealing the end of the conduit can be as simple as drilling 
nicely fitting holes in an inexpensive PVC pipe cap to let the wires exit 
and sealing the wire/hole interstices with silicone rubber or Excel.  If you 
want to go to Herculean lengths then bulkhead feed through fittings with 
rubber stoppers of compression sealing design will surpass the requirements.

Patrick AF5CK