[BC] Lightning

[Mike McCarthy]

I know of one instance of this occurring at a telco CO here.  Over time, 
their damage hits increased and they decided to install a new ground 
system.  While opening up the old one, they discovered the original ground 
system had self-insulated from the surrounding ground.  It took place over 
a number of decades, but did happen.

In some installations where the ground is very sandy or very poor, Chem-rod 
type electrodes and added enhanced conductive fill are necessary to insure 
the ground performs properly over time and doesn't self-insulate.

MM

At 05:52 PM 5/25/2005 -0500, you wrote:
>Wow, then how DO you deal with multiple hits in a place like Florida?
>Do you have to rebury the ground rod now and then?  I would think the
>ground resistance meter that the power company folks have would be real
>valuable for you then.  Curious to know the answer!
>
>Kevin Webb
>
>
>Alan wrote:
>"This is especially true here in Florida, Where a ground rod that gets
>hit by lightning can self insulate by turning the sand surrounding it
>into glass."
>
>
> > Second, I really fail to understand why, even with a good and
>effective
> > grounding system, you would not want to avoid as many lightning
>strikes
> > as possible. It's my understanding that every lightning strike
>degrades
> > your grounding system and protective devices, even if only by a tiny
> > bit; but over time, that damage is cumulative. So, if you have the
>money
> > to spend, why not try to eliminate the lightning strikes?
>
>
>
>
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