[TowerTalk] Schedule 40 or 80 PVC Conduit Underground

[Jim Lux]

On 11/12/14, 7:57 AM, john at kk9a.com wrote:
> Why would tower/antenna control lines and coax need to be buried below the
> frost line?
>

to avoid mechanical disruption of the conduits.. Things like frost 
heaves and the generally mushy condition of the soil during thaw.

Mind you, I'm a California boy and have no practical experience with 
this (thankfully), but my friends who live in Maine tell me that there 
is about a month in the spring when trucks are not allowed on many 
roads.  I can say from personal experience that many of the roads are 
spectacularly wavy and bumpy, which they attribute to the effect of 
uneven freeze thaw.
They also have horror stories about broken sprinkler pipes and such in 
the yard.



> John KK9A
>
> To:	"'Allen Brier N5XZ'" <n5xz at earthlink.net>,	<towertalk at contesting.com>
> Subject:	Re: [TowerTalk] Schedule 40 or 80 PVC Conduit Underground
> From:	"Dick Green WC1M" <wc1m73 at gmail.com>
> Reply-to:	wc1m73 at gmail.com
> Date:	Wed, 12 Nov 2014 07:02:29 -0500
>
> <snip> Where I live, Schedule 80 is
> always used for buried conduit runs, but that's probably because the frost
> line goes down four feet and the conduit has to be buried at least that
> deep. Could be a different story in your area.
>
> 73, Dick WC1M
>
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