When I was working in telecommunications for a major insurance group, we
had both ground rings around multiple building complexes, air terminals
tied to building steel at 197 feet AGL, ground busses on the top floor tied
to the ground mat (under the basement floors) using pairs of 400 MCM cable
and all raceways, ducts, and piping bonded to building steel and the ground
mat. One significant issue with distant towers or buildings with connecting
signal conductors is voltage differential and propagation delay. In one
seven building complex (for 5000 employees) each building was at least 200
feet per side, and five stories tall, with one building the aforementioned
197 foot tower.
If I had a tower 190 feet away with coaxial cable and rotor control leading
to the shack, I 'd ground it, bond it, and put ICE protection on the coax
and control conductors as they entered the ground window. My tower is less
than ten feet from the ground window (built into a basement window) and is
bonded to a ground rod in the bottom of the tower base, an external ground
rod near the base, the ground window, a ground rod in two sump wells, and
the electrical system ground.
YMMV....
73 ES DX,
Gary -- AB9M
Re: [TowerTalk] Connecting Tower to Ground Rod
from [Pete Smith N4ZR] [Permanent Link][Original]
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Connecting Tower to Ground Rod
From: Pete Smith N4ZR <n4zr@contesting.com>
Date: Thu, 10 Oct 2013 08:09:40 -0400
Does this standard apply even if, as in my case, the tower is 190 feet
from the house entrance? Does it need to be a direct, dedicated
connection, or could a hardline shield, for example, be used for the tower
to house electrical service ground connection. In cross section, even
LDF4-50A is a lot beefier than #6.
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