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#203426 - 09/28/11 04:31 PM Best method/tester for Earth Ground Resistance  
PE&Master  Offline
Member
Joined: Feb 2006
Posts: 138
TX, USA
I've got a municipal project that needs to have the earth ground resistance measured using the fall-of-potential method.

From what i can determine this takes a meter with a couple of probes to stick in the ground at specific distances from the ground ring. Aside from that type of device (like a Fluke 1625), they make a earth ground tester that is a clamp on tester. I realize that the clamp on testor won't give me a fall-in-potential measurement but is there a major difference in the two types of testors?





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#203429 - 09/28/11 06:08 PM Re: Best method/tester for Earth Ground Resistance [Re: PE&Master]  
Tesla  Offline
Member
Joined: Jun 2004
Posts: 1,273
Sacramento, CA


Tesla

#203430 - 09/28/11 08:52 PM Re: Best method/tester for Earth Ground Resistance [Re: PE&Master]  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,808
Brick, NJ USA
Tesla:

Thanks for the nice informational link!!!


John

#203432 - 09/28/11 09:58 PM Re: Best method/tester for Earth Ground Resistance [Re: PE&Master]  
KJay  Offline
Member
Joined: Nov 2007
Posts: 763
MA, USA
I looked into getting one of the clamp on ground testers a few years back, but after I read up on them, I wasn’t confident about the accuracy or if it would do what was needed, so I opted for a traditional 3-point tester kit instead. They may have made improvements to them since then though.
The Tech Tips pdf below sort of hits on some of the things I was reading about back then.

Clamp on Method


#203440 - 09/29/11 02:08 PM Re: Best method/tester for Earth Ground Resistance [Re: HotLine1]  
PE&Master  Offline
Member
Joined: Feb 2006
Posts: 138
TX, USA
Great article on the diffences.

I've decided to rent the Fluke 1625 for a couple hundred bucks.


#203471 - 10/01/11 08:50 PM Re: Best method/tester for Earth Ground Resistance [Re: PE&Master]  
nesparky  Offline
Member
Joined: Jun 2001
Posts: 642
omaha,ne
It's been a while since I have been here, Just completed aroject where every building had to have the grounds tested. We used an EXTECH 3 point ground tester. Cost for a new one is about $180.00
Not as fancy or as capable as the fluke referenced above but good enough to test grounding before power is applied. The model we used instructions said not to be used if voltage tested above 10 volts


ed

#203476 - 10/02/11 06:55 PM Re: Best method/tester for Earth Ground Resistance [Re: PE&Master]  
mikethebull  Offline
Member
Joined: Mar 2007
Posts: 100
Rhode Island
I used that EXTECH 3 point meter on a distribution system for a eye glass manufacturer the equipment purchased was from Germany. That meter worked really well.



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