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#12810 - 08/16/02 05:20 PM Gnd. rod resistance tester  
Frank Cinker  Offline
Member
Joined: Jul 2001
Posts: 311
Pennsylvania
Is there a simple, somewhat inexpensive tester to measure ground rod resistance? I've checked my Grainger catalog and couldn't find anything.


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#12811 - 08/16/02 06:10 PM Re: Gnd. rod resistance tester  
watthead  Offline
Member
Joined: Oct 2001
Posts: 172
South Carolina
Yes there is a simple clamp on but not inexpensive over $2000. AEMC and EXTECH offer them.


#12812 - 08/16/02 06:15 PM Re: Gnd. rod resistance tester  
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,875
NY, USA
Frank,

I think you are going to have to define inexpensive.

Watthead,

The EXTECH Clamp-on is under $1400 - we sell them here in the store.
[Linked Image]

There is another type they have that is under $200

[Linked Image]

Look here:
http://www.electrical-contractor.net/the_store/EX/GRT_Main.htm

Bill

[This message has been edited by Bill Addiss (edited 08-16-2002).]


#12813 - 08/16/02 07:14 PM Re: Gnd. rod resistance tester  
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,303
[Linked Image]
This one goes for $113.......


#12814 - 08/16/02 07:50 PM Re: Gnd. rod resistance tester  
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,875
NY, USA
Sparky,

The one that you pictured is meant to measure high resistances.

this one is more suitable for Ground Resistance testing.

Bill


#12815 - 08/17/02 06:23 AM Re: Gnd. rod resistance tester  
Frank Cinker  Offline
Member
Joined: Jul 2001
Posts: 311
Pennsylvania
Thanks for the informtion.
In general, a second ground rod is required to be driven only if the first is found to to have a resistance to ground greater than 25 ohms.
Who usually provides the resistance test, the electrical contractor or inspector?
I'm aware a lot of times the second ground rod is driven just to be done with it and not be concerned with a resistance test.


#12816 - 08/17/02 01:48 PM Re: Gnd. rod resistance tester  
walrus  Offline
Member
Joined: Jul 2002
Posts: 680
Bangor Me. USA
Where I am in Maine 2 ground rods are driven as a matter of course. No one(at least to my knowledge) checks resistence to ground. Drive the 2 rods and be done with it. What about checking it with a copper sulfate electrode, commonly used to check cathodic protection on underground metal tanks and piping


#12817 - 08/17/02 02:57 PM Re: Gnd. rod resistance tester  
Frank Cinker  Offline
Member
Joined: Jul 2001
Posts: 311
Pennsylvania
walrus-

That is basically how it is done in my area. I was more curious than anything else. I thought there may of been a tester somewhere out there that was physically small and in the price range of $60.00 that was made specifically for measuring the resistance to ground of a ground rod.


#12818 - 08/17/02 05:56 PM Re: Gnd. rod resistance tester  
walrus  Offline
Member
Joined: Jul 2002
Posts: 680
Bangor Me. USA
Frank

A copper sulfate electrode can't be that expensive? and then all you need is a 10meg ohm multimeter to check resistence. Whether or not this meets AHJ standards I have no clue. I can tell ya that soil conditions make a huge difference on how the copper sulfate elevtrode reacts.


#12819 - 08/17/02 09:31 PM Re: Gnd. rod resistance tester  
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,303
oops, yeah it's a megger.....


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