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#103461 - 08/09/02 08:30 AM Ground Rod Installation  
Joe Tedesco  Offline
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
[Linked Image]

Using the 2002 NEC, What's wrong here?

Note: As this area is sometimes used as a reference for Vocational studies we request that comments be kept to the subject as much as possible. Thank You for your cooperation in this matter.


[This message has been edited by Joe Tedesco (edited 08-09-2002).]


Joe Tedesco, NEC Consultant

2017 / 2014 NEC & Related Books and Study Guides

#103462 - 08/09/02 11:51 AM Re: Ground Rod Installation  
Redsy  Offline
Member
Joined: Mar 2001
Posts: 2,056
Bucks County PA
250.53 (G)
Last sentence.
The upper end of the electrode shall be flush with or below ground level unless the aboveground end and the GEC attachment are are protected against physical damage.
BTW,
I would have the conductor on the other side of the rod, with the set screw biting into the rod itself.


#103463 - 08/09/02 06:26 PM Re: Ground Rod Installation  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,853
Brick, NJ USA
I believe that the "acorn" clamp is used incorrectly. As Redsy said, the method we have always used is the rod is between the setscrew and the conductor. In the manner it's installed, physical damage will be inflicted on the conductor.

Also. the rod must be flush or below grade, or protected from physical damage.

HotLine1
John


John

#103464 - 08/09/02 07:25 PM Re: Ground Rod Installation  
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
We use similar style clamps in England.

I agree with you -- I always put the cable on the opposite side to the set screw.


#103465 - 08/09/02 08:16 PM Re: Ground Rod Installation  
Gwz  Offline
Member
Joined: Apr 2002
Posts: 197
Appears to me that the rod is cut about half-way-thru just below the acorn clamp losing circumference.


#103466 - 08/11/02 11:13 AM Re: Ground Rod Installation  
Currently  Offline
Member
Joined: Apr 2002
Posts: 53
TN
That 'groove' is there so an inspector can tell if the entire rod is driven into the ground. Pulling these things out after hitting ledge or a stone is not a fun or productive thing to do. (Why does it happen at 6 1/2 feet?)

Wondering what are some techniques some of you guys use for driving them in or pulling them out?


#103467 - 08/11/02 02:25 PM Re: Ground Rod Installation  
caselec  Offline
Member
Joined: Apr 2002
Posts: 558
San Jose, CA
We us a Bosch Demo Hammer with a ground rod attachment. Works great and easy on the body.


Curt Swartz

#103468 - 08/11/02 03:28 PM Re: Ground Rod Installation  
arseegee  Offline
Member
Joined: Jan 2002
Posts: 324
Statesboro, GA USA
I use a rotary hammer with rod attachment. Best money I ever spent. When I have to do it by hand I use a "monster maul". It's an over sized wood splitting maul that has a 32" hollow pipe handle and a 16 pound head. Just slide handle over rod and go.


#103469 - 08/13/02 05:06 AM Re: Ground Rod Installation  
joeh20  Offline
Member
Joined: Mar 2002
Posts: 95
Tullahoma, TN, 37388
We put in 18 one day at a mobile home park we set up. Put 17 of them in with the front endloader bucket on a 40hp Kabota tractor.
Start them in a hole with a shovel and let the bucket down. One hit a rock and doubled back and came back out about two and half feet above grade. We replaced it with a new one drove with a Milwaukee demo hammer and ground rod attachment.


Lighting the way

#103470 - 08/13/02 09:42 PM Re: Ground Rod Installation  
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
I have found radically different soil conditions within ten miles...from mean hardpan to one that just about was lost in “quicksand”-like conditions. I’ll side with sparky the ¾-inch GRC is just right for ¾-inch rods. A ±3x18-inch shaft scrap can be welded to a ¾x6-inch GRC nipple, and three more nipples strung together with couplings. After reaching ~2-foot rod exposure, depending on elbow room, remove the nipples one at a time, or, reversing the driver and use the GRC attachment as a handle to limit stoop labor.


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