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[TowerTalk] lightning strike

To: <>
Subject: [TowerTalk] lightning strike
From: "Skip K3CC" <>
Date: Thu, 29 May 2008 14:17:50 -0400
List-post: <">>
    If everything is perfect in the world with your grounding systems  how 
fast is fast enough to prevent damage from a direct lightning strike of over 
100,000 A at a freq near 10 Gigs.    The heat that can produced from a 
strike is that greater then the temperature of the Sun.

A little over 10 years I lived in Kempton, PA atop a ridge at 1000 ft ASL. 
My tower was grounded OO wire from each leg about 6 ft up from the base.

We had an indirect strike of lightning come through our 400A underground 
service, fuse the line and destroy all electrical and electronic devices 
plugged into the outlets.  Cost over $30,000 w/o the electrical service. 
The above ground transformer box was completely destroyed and the concrete 
pad gone. that service was for about 6  homes

I guess this is why I can't believe you can protect yourself from a direct 
lightning hit.

In the 60's I worked for a radio station WAEB.  I remember what we went 
through grounds and megging the system.  I was told the important thing was 
to keep the strike outside the transmitter/studio building.

I can't disagree with most of the steps that are taken,  It takes a lot of 
copper in the ground, taking reading with a megger, and trying to stay away 
from the RF  ground system.  However, I think they will only prevent 
transients, not direct strikes

de Skip K3CC 


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