Re: Way off the wall O/T

Posted by buickanddeere on June 07, 2007 at 11:31:12 from (216.183.144.41):

In Reply to: Way off the wall O/T posted by old on June 06, 2007 at 21:25:29:

If you run grounds the way radio comercial transmitter sites do, you will be ok. Pro Ham Radio Shacks too. They are usually back on the air 5-10 seconds after a direct lightening strike.
We are talking hundreds of feet of heavy gauge copper wire in a buried radial pattern. And ground conductors made of flat strips/bars of copper rather than round. And real surge suppressors.
As for the rest of us. The sharp DC impulse spike of lightning is different than the sine wave of AC. So even if line to neutral or line to ground stays under 200V or so on 120Vac. Some sensitive electronics will fry.
A lighting strike is such a high impulse current. It's own magnetic field generated by it's current will limit the elctricities ability to turn corners or follow ground conductors. So the lighting tends to jump from, more or less straight to easiest ground. Depends if your equipment is along the pathway.
If everybody's electrical service had an up to date, code legal grounding system. Lighting strike damage would be less common & less severe.
One old 6 ft ground rod driven into dry earth isn't a grounding system. Even two new 10 ft ground rods are poor grounds in sand or dry soil.
A deep well casing is about as good a ground one will find.
Ground cables should run straight from the panel or services direct to the ground rods with no or as few as possible turns. And turns must be large dia radius of 2+ ft rather than a sharp 90 degree bend.

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