I suggest that you NOT use the corrugated pipe. It could cause more
friction and snagging on cables and connectors than you would want to cope
with. If you ever get hold of some semi-rigid CATV hardline and try to pull
that in the pipe already occupied with other cables you would find out in a
hurry.
I believe that most of the water (and you would be surprised how much can
accumulate) will be from condensation. You cannot easily prevent this so
the best thing to do is expect it and make sure that you use only high
quality totally waterproof jacketed cables . In most cases this only
requires making sure that there are no abrasions on the jacket that could
allow water to penetrate to the shielding. You can help by having drain
holes in the bottom of the pipe if you have dry terrain but if you are like
me the water table is virtually on the surface and I will have water filled
pipe on a near permanent basis.
John AB4ET
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