The answer we all seek is not a simple one......the only way that a pipe
or conduit will NOT "sweat" and manufacture its "own" moisture is to be
buried below the level in your area that remains constant ( temperature
wise) year round regardless of season and temperature. Even then, you have
the problem on each end where the pipe comes up to the surface for the coax
to exit....It is at these 2 points the varying temperature will cause
sweating and moisture will form and collect regardless. A continuous flow of
air through the pipe would presumably keep the moisture out or at least to a
minimum....but how to do that simply and economically is yet another problem.
It may help to coat the coax with a film of vaseline when installed to
help seal the micropores of the coax (assuming the vaseline doesnt "wick"
into the coax and contaminate....and I am reasonably sure its inert for what
thats worth) and the added plus of the lubricating the coax to help it as its
pulled into the conduit. The main thing here is clear....if you went to the
trouble of putting your coax into conduit or pipe and burying it, you did it
mainly to get it out of your way for aesthetics and convenience. The job of
replacing coax will not be nearly as hard when replacement time comes around,
as you already have the conduit buried and grass has grown over.
Someone else mentioned another important thing.....go twice the size you
think you need.....In my humble opinion, thats the
minimum......Remember....the harder you have worked and the more you have
prepared....the more Murphy will be around at some time. The larger your
conduit is...the easier it will be to add new coax, or replace existing coax
as the need arises.
73 Bob '4t
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