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Old 02-03-2009, 11:03 AM   #1
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How to properly test grounding system


Good morning;
Since I have been thinking about installing whole-house surge-protection, I started thinking about my brother's house as well as the one I live in.
My brother has has a few incidents with blown electronics, probably during storms (not a direct hit).
I am now wondering whether there is something wrong with his grounding system.

I have not been to his house recently, and have never looked closely at his SE.
What equipment would be required to test the grounding system?

Thanks

FW

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Old 02-03-2009, 11:11 AM   #2
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How to properly test grounding system


The testing equipment for checking the ground resistance is very expensive. It really is unnecessary to do this in my opinion. I would simply check for the properly installed GES at the service entrance. About all you can change after that is the number of ground rods or the type of supplemental electrode.

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Old 02-03-2009, 11:29 AM   #3
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How to properly test grounding system


you need a mega-meter. As posted too expensive. When you wife upsets you, let here go around and touch all the metal....
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Old 02-03-2009, 11:44 AM   #4
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How to properly test grounding system


Quote:
Originally Posted by Bob Mariani View Post
you need a mega-meter. As posted too expensive. When you wife upsets you, let here go around and touch all the metal....
I don't have a wife<g>, it's my brother's wife who will upset him, and me<g>
Next time I'm over there, I'll do a visual and maybe take a look inside the panel to make sure everything's Kosher.

Actually, I thought I had read here that testing a grounding system required expensive equipment, but I wanted to be sure.

FW
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Old 02-03-2009, 11:59 AM   #5
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How to properly test grounding system


Generally two ground rods placed 6 ft. apart is an excellent ground.

Problems with ground rods are someone hits a rock when driving one, and then they cut it off "short". So if you did not install the ground rod(s) or see them installed, this is possible. Not likely, but possible.

I've read about "counterfeit" ground rods which are not made of the correct metal. This could be a problem.

Then there are rocky areas where it is impossible to drive a ground rod, then special things must be done to get a good ground. Ask the locals what to do if this is the case in your area.

I like the idea of testing if there is a problem. Might call around and see how much it would cost for someone to test for you. Or maybe it will be cheaper to just drive an extra ground rod or two and connect them to the existing ground rod(s). Then you will know for sure you have at least two full length ground rods.

As for surge protection, I have a whole house surge protector and good quality power strip surge protectors at each outlet, which has an electronic gizmo. And I have two ground rods 6 ft. apart which I know are the full length. I have not had any problems with electronic stuff getting zapped.

On ground testing...
http://ecmweb.com/grounding/electric...ng_techniques/

Ground testers (not cheap!)...
http://www.specialized.net/ecommerce...stance+Testers

Counterfeit Ground Rods...
http://www.ul.com/newsroom/newsrel/nr012809.html

Cut off ground rods (about 2/3 way down page)
see "Ground rod cut off or short"...
http://www.inspect-ny.com/electric/E...Inspection.htm
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