On 5/9/2014 3:00 PM, Larry Banks wrote:
BuryFlex is good coax. That said, it's not a true direct burial coax. I
have lots of it, direct buried. I have areas where it's in conduit.
Talk with Steve at Davis and listen to what he says. I'd not direct
bury where there are any sharp edged stones, or where yard equipment
might contact it under soft soil.
If you use the perforated drain pipe, bury it deep enough so that
anything heavy on the drive will not collapse the pipe.
"I do not think" freezing water would normally be a problem, but
BuryFlex(TM)has nothing to prevent water from migrating through the
shield if the jacket is perforated.
I do not bother drilling holes to drain the conduit. I used to, but
gave up on the idea. I have a lot of 3" underground conduit. I simply
liberally wipe the joints with either DC-4 silicone compound, or
Vaseline. The lube serves two purposes. To fully seat the joints and to
be able to get them apart should I desire to dig them up. Even at
several feet, the junctions will be water proof.
Most
http://www.rogerhalstead.com/ham_files/cablebox.htm I originally sealed
the conduit at one end, but no longer do that. Bugs can not get in at
the outside end and it opens into the basement through the end plate
between the joists. No smell, but I'm certain there is some water
accumulation that freezes.
The photos show the shorter run from the tower to the shop. The rum is
a "little" longer than the distance, so with the bends the entire
conduit run is under compression.
The conduit no longer runs through the basement wall. Be careful doing
that. I have a large ground system. We put in a new, large septic
tank. The crew hooked a ground rod and not only pulled up a lot of
copper, but pullled out a section of basement wall as you can see the
work on the wall about 5 pictures down. That is the old plastic drain
pipe I used for conduit at the time. (unperforated)I now have a larger
junction box at the entrance too.
So I would protect the BuryFlex(TM) where it seemed appropriate. If the
run were to be difficult to get at, then I'd use tru direct burial cable.
If Steve is satisfied the drain pipe will protect the BuryFlex I'd go
with it. He's a very helpful guy.
BTW. I pulled out a brand new roll of BuryFlex with the plastic still on
is about 2 hours ago. To make a run from the AV680 to the 6-Pack in the
box at the base of the tower.
73
Roger (K8RI)
Hi all,
I am running Davis Bury-Flex out to a new 40M vertical in my back yard. (Maine
coast.) As it is going across gravel walkways and near garden beds, and will
not be that far below ground level, I am worried about it getting cut or nicked
in the future from yard work, etc.
My plan is to use 1” sched 40 PVC conduit – the gray stuff – for protection.
(I will not be adding additional coax, wires, etc., ever, so this should be big enough.)
My Concern: the conduit will obviously become full of water – will freeze
cycles and the expansion of ice inside the conduit compress and therefore damage the
Bury-Flex in any way?
73 -- Larry -- W1DYJ
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