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[TowerTalk] Rebar In Tower Base

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Subject: [TowerTalk] Rebar In Tower Base
From: (Dick Flanagan)
Date: Wed, 1 Apr 1998 08:20:49 -0800
At 2:43 AM -0800 4/1/98, Malcolm Clark wrote:

>Pete Smith wrote:
>> Well, the Polyphaser book and various other references talk about using the
>> rebar cage in your tower base as a Ufer ground, connected to the tower.
>> Apparently this significantly increases the current-carrying capability of
>> your ground system in the event of a lightning strike, but requires that
>> the entire rebar cage be welded, not wired together, and that a good
>> large-gauge electrical connection be made to the tower itself.
>That's really interesting.  I respect Polyphaser's opinion but Rohn
>specifically states that the rebar cage must not be welded.  I'd love to
>hear those two industry leaders debate their conflicting views.

Discussing tieing vs. welding tower base rebar, the Polyphaser book (p. 14)

   " has been found that these wire ties are surprisingly effective
   electrical connections. ...One might think that the ties would fail
   under fault conditions. However, it should be remembered that there
   are a large number of these junctions effectively in parallel, cinched
   tightly..." (IEEE Seminar Notes 1970).

73, Dick

Dick Flanagan W6OLD CFII Minden, Nevada DM09db (South of Reno)

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