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Re: [TowerTalk] Control and coax cable removal question

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Control and coax cable removal question
From: jimlux <jimlux@earthlink.net>
Date: Thu, 15 Oct 2020 06:05:21 -0700
List-post: <mailto:towertalk@contesting.com>
On 10/15/20 4:47 AM, john@kk9a.com wrote:
Or you can cut the PVC pipe and replace the small portion that has the spray foam and remove the wires at the same time.

BTW, I am not an electrician so do your research but I believe that it is a towertalk myth that you cannot run the 120v crank up tower motor wires in the same conduit as your control lines (assuming that all wires have the same 600v insulation)

John KK9A



Most coax has a 300V rated jacket (9913 is 300V, for instance, as is 9258 (RG-8X), LMR-400's datasheet doesn't even give a UL rating)

Romex (NM-B) is 600V, as is the usual THHN building wire.


There's some trickyness with respect to the code in running different voltages. It's not clear that antenna cables are Class 2 wiring - the rule says that Class 1 and Class 2 can't run in the same conduit, unless separated by a continuous barrier (is a second layer of insulation, e.g. Romex, a "continuous barrier"?) -


725-54(a)(1) lets you put low voltage and high voltage in the same enclosure where the HV is not more than 150 V to ground and "solely to connect to equipment".

There's a whole bunch of rules about Class 1, 2, and 3, mostly differentiated by "power limiting".



jimlux wrote:


DO you need to preserve the cables? or can you cut them, and then use a
roto-rooter/plumbers snake approach to clear the conduit?


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