[TowerTalk] Control and coax cable removal question

[jimlux]

On 10/15/20 4:47 AM, john at 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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