Another repetition of the exploding base myth.
If concrete is so explosive, and such a poor conductor, why is it often used to
assist with rod-earth connections?
As well, the very existence of the Ufer ground pretty much debunks the
exploding base mythology.
73,
Kelly
Sent from my iPhone
On Dec 30, 2012, at 12:33, "Michael Mraz" <mike.n6mz@gmail.com> wrote:
> My dear old SK friend Al Caplan, who used to manage the Hy-Gain amateur
> division when it was part of Telex, was emphatic about proper grounding when
> I bought my HG-52 crankup. He said that lightning could split the concrete
> around the re-bar if the tower took a direct strike. It was a long time ago,
> but my recollection was that this nasty event actually occurred to some
> unfortunate ham who had to abandon the old foundation and install a new one
> in a different location.
>
> 73 Mike N6MZ
>
> At 17:17 30-12-12, Patrick Greenlee wrote:
>> I have a friend who is a ham and is EE with 30+ years of antenna design
>> experience. He tells me emphatically, "concrete is not a good conductor."
>> Given this, I'd be trying to not depend on concrete as part of a grounding
>> system. Rebar installed correctly in steel reinforced concrete is probably
>> at least 2 inches under the surface of the concrete on any side, top, or
>> bottom. Weld plates installed when the concrete was wet (to give you
>> something to anchor to) or bolts or other components set into the concrete
>> are typically NOT in contact with the rebar cage inside the concrete (which
>> is not a good conductor anyway.) So again, it is better to not rely on the
>> concrete to conduct.
>>
>> 73 Patrick AF5CK
>
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