[TowerTalk] 220v trench proximity to 7/8” feedline trench?

[john nistico]

You should never run line voltage in the same conduit or within 3 feet of lines unless the insulation voltage ratings are rated for the same voltage. This is as per the national electric code.

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From: TowerTalk <towertalk-bounces at contesting.com> on behalf of Steve Maki <lists at oakcom.org>
Sent: Friday, August 7, 2020 6:11:58 PM
To: towertalk <towertalk at contesting.com>
Subject: Re: [TowerTalk] 220v trench proximity to 7/8” feedline trench?

If it's the 60 Hz field being close to the other cables that you're
concerned with, just de-energize the AC cable when not needed.

I have some some 120V AC lines in the same conduit as my rotator and
relay control lines, with direct buried Heliax just above and below the
conduit (up to to 500' runs), and have not noticed any issues. Normally
I only energize the AC when I need to do some soldering or run a capstan
winch out there, but sometimes forget to flip the breakers off for
extended periods.

-Steve K8LX

On 08/07/20 14:59 PM, Ed Post wrote:

> Need some guidance as it relates to the proximity of a new 220 V power line (trenched and in PVC conduit) running to my crank up tower (3 HP motor) about a 500 foot run from my barn and 2 runs of 7/8” hardline (partially trenched through fields and not through the woods) all terminating at the tower base.
>
> What is the minimum that the 220v trench should be separated from the 7/8” feedlines trench? they will run parallel for about 250’ then go their separate ways, 220V to barn, 7/8” to the shack.


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