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Old 06-22-2008, 08:49 AM   #16
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Lightning stirke, breakers tripped...


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Originally Posted by jrclen View Post
Make sure all ground rods on the premises are bonded together. Telephone, electric, antenna, well casing if you have one, and metal water pipe coming in from underground.

Lightning travels through the ground from where it strikes, in gradients. Dropping in voltage as it goes. So a ground rod for say the telephone on one side of the house could be thousands of volts different from the electric service ground rod on the other side of the house, if they are not bonded together. That voltage is going to try to equalize by flowing through your circuits and equipment.
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This is worth a second read.
Bond, bond, bond. Keep that gradient low as possible.
Lightning can induce voltage, without any direct strike.

I went to a Mike Holt Grounding/bonding seminar last year, and the way he put it was, we try to minimize the damage from induced voltage the best we can . Direct strike - you are screwed.


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