I forgot this: Be certain the ends of the conduit are well blocked
somehow, and inspect the blocking now and then. Critters can be clever and
get into the conduit. I had chipmonks in mine. They ate the insulation
from buryflex (!!) and then ate the insulation from the SteppIR control
lines, which then shorted somehow and wrecked the control head and one of
the steppers. Don't know how they did it, but they did it. (This was in
the 4" conduit.)
When I dug up the 2" version, I spent some time sloping the 4" replacement
and drilled 1/4" holes in the bottom in a few places at the low end of
the slopes. Perhaps water in the conduit could be ignored, but only if
every line is unspliced and with water-proof insulation --- I did want to
depend on this perfection, so I arranged for the conduit to drain itself.
You WILL have water in the conduit unless it is perfectly sealed from the
atmosphere.
Bill - W2WO
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