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[TowerTalk] Conduit for cables to the tower?

To: towertalk reflector <>
Subject: [TowerTalk] Conduit for cables to the tower?
From: Alan NV8A <>
Date: Wed, 13 Sep 2006 21:35:52 -0400
List-post: <>
I have questions about the best way to get cables (coax, AC, and 
control) from the shack to the tower.

Here are the things I have read or observed and am trying to take into 
account. Please correct me if I am wrong on any point.

1. Low-voltage wiring (e.g., for rotor and other control functions) 
cannot be run in the same conduit as regular power wiring.

2. All cables should run in grounded metal conduit for effective 
lightning protection, according to Polyphaser.

3. The bends in the conduit for a single run of cable may not exceed 360 
degrees or it becomes too difficult to pull the wires through.

4. EMT is not buriable. This suggests that RMC must be used, but can it 
be bent? Or can liquid-tight flexible metallic conduit be buried, and 
does it provide sufficient protection? Is there a means of grounding the 
metal in such conduit?

It looks as though I will need three separate runs of conduit: one for 
the feedlines, one for power for the crank-up, one for the control 
cables and rotator power.

The conduit run for 120V power looks like needing six 90-degree bends 
(two too many), and the other cables eight (double the permitted number).

How have others handled their cabling?


Alan NV8A

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