Re: Lightning Damage
- From: Chris L Peterson <clp@xxxxxxxxxxxxxxxxxx>
- Date: Sun, 30 Apr 2006 22:35:47 GMT
On 30 Apr 2006 12:06:37 -0700, "w_tom" <w_tom1@xxxxxxx> wrote:
"The cow died because she's got two pairs of feet a few meters away
from one another" was exactly the point. Chris L Peterson demonstrated
why improper earthing can cause damage. He probably has multiple earth
ground - items he assumed were non-conductive. Therefore lightning
came out of the ground - just like the cow - went through electronics
and then back into earth. Table, wall paint, linoleum tile, and wooden
walls are all conductors. Some better than others. It all explains
why a single point ground must be the best earth ground for that
structure.
Not even close. The damage was clearly caused by EM. It was only present
in the interface chips at the end of cables.
I've seen what paint and other materials look like after lightning
passes through them. There was no indication at all that anything like
this happened. The structure itself wasn't hit, and the way it's built
up on posts doesn't provide much opportunity for ground currents to pass
through. No amount of grounding in the world could have helped... the
instruments that were damaged weren't even plugged in!
If you don't believe that the EM pulse from lightning can damage
electronics, you simply don't know much about the subject.
_________________________________________________
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
.
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