[TowerTalk] exploding concrete

[David Gilbert]

I think that's the same article referenced here earlier by W9AC.  And 
yes, the tower base by itself doesn't really qualify as a Ufer ground.  
The rebar cage, distributed throughout the foundation and located within 
a few inches of the surrounding soil, comprises the Ufer framework. 

What I also noticed in that article, though, was this comment:

"Copper and steel conductors embedded in concrete also create an 
effective ground. Such a ground system is called a Ufer ground (after 
its inventor, Herbert Ufer, who was a consultant to the U.S. Army during 
World War II).   Too often, the designer fails to bring conductors 
outside the foundation for bonding to the earth electrode system."

Note the last sentence above ... am I reading it correctly that it 
suggests running wires from inside the foundation to the ground system 
outside it?  I honestly can't tell from the way it is worded.

Dave   AB7E




Dave Bowker wrote:
> An interesting article in MRT for April 1, 2007 > 
> http://mrtmag.com/techspeak/radio_wellgrounded_principles/index.html < dealing with grounding of 
> structures and downleads and the Ufer ground includes a photo  (Fig-4) showing lightning damage to a 
> concrete tower pier due to lightning surges through the foundation.  It cautions against use of a 
> Ufer ground consisting solely of the tower foundation.
>
> 73, Dave, K1FK
> Fort Kent, ME
>
>
>
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