[TowerTalk] Pulling coax through PVC pipe

[Chick Allen]

One thing to consider that will mitigate the "wet location" issue is to vent the conduit with some vents installed along the conduit.  This is done using a simple pvc "tee".  If you're using 2" pvc, just connect the lengths at several different points with a 2"x2"x2" tee, reduce the vertical tee to something smaller, like 1" or 3/4" and bring that about one foot above the ground.  There you can add a sweep el that will prevent moisture from entering the conduit while allowing condensation to evaporate.  Plan your above ground vents around a fence post or some other above ground object so it won't get broken as easily.  Otherwise, a short piece of treated 4"x4" will provide a stable support.  Works for me.

73 de Chick / NW3Y 



-----Original Message-----
From: Shane Youhouse <kd6vxi at gmail.com>
To: towertalk <towertalk at contesting.com>
Sent: Tue, Jan 30, 2018 2:34 pm
Subject: [TowerTalk] Pulling coax through PVC pipe

I wouldn't be so quick to run ANY romex through PVC when it's buried.  It's
against code.

Article 300 of the NEC states any buried pipe is considered a wet location.

*300.5 Underground Installations.*
*(B) Wet Locations.* The interior of enclosures or raceways installed
underground shall be considered to be a wet location. Insulated conductors
and cables installed in these enclosures or raceways in underground
installations shall be listed for use in wet locations and shall comply
with 310.10(C). Any connections or splices in an underground installation
shall be approved for wet locations.

Then, article 334 implicitly states you may NOT use romex (NM) in damp
locations.

*334.12 Uses Not Permitted.*
*(B) Types NM and NMS*. Types NM and NMS cables shall not be used under the
following conditions or in the following locations:

(4) In wet or damp locations

As such, you are MUCH better off running single runs of wire in addition to
a heavy ground to keep SPG intact

There are a LOT more rules regarding NM style wiring, but this is the gist.

Also, it's not always wrong to mix 120 volt and low voltage.  As long as
you use THHN or other 600 volt insulation and all wiring is class 1, you're
OK.

--Shane
KD6VXI
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