[TowerTalk] Buring Bury-Flex

[Roger (K8RI) on TT]

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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