[TowerTalk] water in EMT conduit

[K8RI]

On 2/26/2013 12:22 PM, r miles wrote:
>
> It comes from the temp. change especially during large ground temp.
> changes due to warm,cold fronts etc.
>

it doesn'y have to be ground temo changes although the help

Just atmospheric and temp changes cause the conduit to breathe.
Trying to seal the conduit will almost guarantee moisture condensation.

I leave the conduit open on both ends, except one end is in the basement 
and the other in a large NEMA box.  The conduit can breayh freely which 
helps get rid of moisture and prevents it from becoming trapped.



> If it was very deep it might not condense but it has to bring cables to
> the surface into an area where the ground temps vary.

If the conduit is below the air temp, you will get condensation.

73

Roger  (K8RI)
>
> My long run to the HyTower follows the terain. In a low spot I drilled a
> few 1/8'' holes in the bottom of the plastic EMT. Put rocks or something
> in to keep the leaking moisture from making mud which will clog the holes.
>
> K9IL
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