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al,
Yes, it will help with those types of charges, but if there is any real current, the connection to earth will not provide equal potential.
Don
 
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Don, I agree that grounding doesn't work all that great because the earth is a poor conductor.

But.

I think you have a much better chance of keeping the earth in a garage near 0v. with the foundation grounded than you do with a couple rods and a water pipe.

If you do have a leak to ground at least you'll have a lot more earth near 0v. versus leakage voltage with the foundatioin grounded.

Edit: I changed at 0v. to near 0v. cause I know you'll catch that. :D

[ March 14, 2005, 01:01 PM: Message edited by: physis ]
 
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Sam,
Yes, more electrodes equals a bigger area of the earth that is near zero, but even with more electrodes, if there is a fault to the grounding electrode system that is not cleared, the voltage in the earth will only rise to meet that of the electrode for a small area near the electrode. If you put one lead of a voltmeter on the electrode and the other in the earth 30" away from the electrode, you should measure between 70 and 90% of the voltage on the electrode. If you move the lead in the earth closer to the electrode this percentage will go down.
Don
 
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So is it your thinking that grounding is mostly only good for clearing a utility primary fault?
 
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And for some protection from lighting. It provides very little in the way of safety for people on low voltage (under 600v) systems.
Don
 
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It seems in a lot of ways grounding doesn't do much at all. I wonder if Charlie E. could throw in some numbers or what percentage of the time service grounding successfully clears primary faults.

Either way I still think it's good to try to keep things at 0v.
 
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I have worked in Florida since the late seventies in different parts of the state,Have encountered sugar sand that I didn`t need a driver at all,coral beds that you cannot get through and the worst was hard pan.Lake bottom dredged to compact land that a chipping hammer with a ground rod driver could not penetrate more than 3 ft.Answer to that was 7 ft of copper hard plumbing pipe a gate valve and a hose adaptor.Watch it though if you foget it is getting washed in you might never see it again :eek:
 
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