First off, I believe that applies only to towers and their
associated grounding and guying system.
Secondly, I have great concerns about the logic (and the company)
behind the F revision. Yes disimilar metals are an issue, and
perhaps that tower did fall because of corrosion caused by that
scenario; however, there are many issues that should be looked
at in considering what to use. One of them is pH. Another is the
fact that an anchor going into the earth and then into concrete will
corrode at that point, and a third is that an anchor going through
several layers of earth, each with a different pH, will corrode at
each of the boundaries. So I think by narrowly focusing on one,
albeit important, aspect, other important issues are ignored which
can (and will) cause havoc in the future.
I will base my decision on the pH of the local soil, and depending
on that, the cost differntial of the galvanized and copper-clad ground
rods. If a tower was involved, I would follow Rev F although
I disagree with the reasons behind the galvanized only stricture. I am
sure too that the legal types would suggest I go with galvanized
regardless of pH if a tower was involved.
73, Bob AA0CY
----------
From: Bill Hider, N3RR[SMTP:n3rr@erols.com]
Sent: Sunday, July 19, 1998 6:10 PM
To: Bob Wanderer
Subject: Re: [TowerTalk] Ground Rods
Bob,
ANSI/EIA/TIA-222-F says you must use galvanized. What's the debate?
Bill, N3RR
Bob Wanderer wrote:
> Yep, I found 5/8" x 8' ground rods at the Home Depot in Tukwila.
> The galvanized ones were about but under $6 and the
> copper-clads were over $12. I still need to look at other
> sources and see how they're priced; unless these are typical.
>
> Do you know what the pH of the soil is around this area? In Nevada
> it was neutral to slightly alkaline (pH=7~8). This would normally
> call for copper-clad, but if we assume the pH in Seattle is also
> so low on the alkaline side (and that seems a reasonable
> assumption, and the difference between galvanized and
> copper-clad so great, I'm wondering if there really is any
> advantage to going with copper-clad. What's your opinion?
>
> 73,
> Bob AA0CY
>
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