On Sun,1/10/2016 10:26 AM, Grant Saviers wrote:
"The resistance of the grounding electrode system is only a general
measure of
merit. Proper design and installation of the grounding electrode
system, installation of ground rings, ground rods, radial grounding
conductors, and the bonding of systems and equipment, is as important
as the resistance to earth."
This the most relevant statement in the several you have quoted. Think
about it -- many (most?) VHF/UHF communications facilities are located
on mountaintops, where the "soil" is largely rocky/sandy. Heroic efforts
are required to attain even a modestly low resistance to earth.
At the height of the telecom bust, a colleague bought two decommissioned
AT&T Long Lines sites on mountaintops, and I had a station in one of
them for a while. I had the opportunity to study AT&T's drawings for the
building and for the grounding. Every detail was noted; there are many
earth electrodes, and there is extensive bonding both inside and outside
the building. This particular site is on a 3,000 ft peak in NorCal, with
a 2-story building that is 120 ft x 60 ft and a 150 ft tower that is 32
ft x 32 ft at the base and 24 ft square at the top. There's a photo on
the W6BX qrz.com page, which I shot from a wooden fire observation tower
about one hundred feet higher at the actual peak.
73, Jim K9YC
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