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#90805 - 12/11/04 08:46 PM Dual Ground Rod Bending Direction  
mustangelectric  Offline
Member
Joined: Feb 2004
Posts: 494
Bentonville, AR
Hi,
I figure the Subject of this message will make a few people scratch their head!
If I place two ground rods 6 feet apart but hit bedrock with the second rod and it is in a 2 foot deep trench which way can i bend the rod? Towards the first or away from the first.

I got it down about 4 feet and it would not go any further.

thanks for any replies or comments..

-regards

Greg


Electricity has no respect for ignorance!

2017 / 2014 NEC & Related Books and Study Guides

#90806 - 12/11/04 10:29 PM Re: Dual Ground Rod Bending Direction  
Ryan_J  Offline
Moderator
Joined: Aug 2003
Posts: 1,374
West Jordan, Utah, USA
If you're hitting solid rock, I would think you are screwed either way. I would be willing to bet that the parralleling efficiency would be better if they were angled away from each other, but I would also be willing to bet that you would not get 25 Ohms, even if you drove a half dozen of them! [Linked Image]


Ryan Jackson,
Salt Lake City

#90807 - 12/11/04 10:47 PM Re: Dual Ground Rod Bending Direction  
mustangelectric  Offline
Member
Joined: Feb 2004
Posts: 494
Bentonville, AR
Hi,
The firts rod drove in all the way, the second rod located 6 feet away went down 4' the stopped the trench was 2' deep.

Once it is backfilled isnt this in compliance?

-regards

Greg


Electricity has no respect for ignorance!

#90808 - 12/11/04 10:55 PM Re: Dual Ground Rod Bending Direction  
BigB  Offline
Member
Joined: Mar 2004
Posts: 719
Tucson, AZ USA
I had a similar situation, however I could get neither rod to go more tham 3 feet anywhere on the property. I was using a Bosch demolition hammer with grd rod attachment. I finally pulled them both out (by twisting them with a pipe wrench) and drove them at a 45 degree angle. They went to the bedrock then slid along on top of it. The inspector didn't even question it.


#90809 - 12/12/04 09:21 AM Re: Dual Ground Rod Bending Direction  
winnie  Offline
Member
Joined: Sep 2003
Posts: 649
boston, ma
Mustang,

I don't believe that you are permitted to bend the rod, but I believe that you are fine if you bury the _entire_ rod horizontally at a depth of 2 feet.

Where does this trench extend? Have you considered using a ground ring instead of rods?

-Jon


#90810 - 12/12/04 09:28 AM Re: Dual Ground Rod Bending Direction  
electure  Offline


Member
Joined: Dec 2000
Posts: 4,259
Fullerton, CA USA
Winnie,
Could you explain further? Why would a rod have to be straight?

mustang's right. Now I'm scratching my head


#90811 - 12/12/04 09:33 AM Re: Dual Ground Rod Bending Direction  
earlydean  Offline
Member
Joined: Dec 2003
Posts: 751
Griswold, CT, USA
Bend the rod away from the first.
The NEC only requires 8 feet of rod in contact with the earth, six feet apart.
If you are concerned with the rod's length, then add a third rod in a triangular pattern.


Earl

#90812 - 12/12/04 10:36 AM Re: Dual Ground Rod Bending Direction  
trekkie76  Offline
Member
Joined: Jun 2004
Posts: 220
baileyville, maine, usa
The trench would have to be at least 2.5 ft deep. The section only talks about driving the rod to a depth of 8 ft, or where bedrock is encountered, buried in a trench. can't see where they talk about bending it, other than having 8 ft in contact with the soil.


#90813 - 12/12/04 12:51 PM Re: Dual Ground Rod Bending Direction  
dmattox  Offline
Member
Joined: Oct 2004
Posts: 265
Anaheim, CA
See 250.53(G)

If you hit bedrock you are allowed to drive at up to a 45 degree angle. If you still hit bedrock at a 45 degree angle you then can bury it in a trench that is at least 30" deep.

You may not bend the rod unless its more than 8' long. You must use connectors that are rated for direct burrial.

You need to make sure that at any point the 2 ground rods are at least 6' away.


#90814 - 12/12/04 01:12 PM Re: Dual Ground Rod Bending Direction  
dmattox  Offline
Member
Joined: Oct 2004
Posts: 265
Anaheim, CA
I was bored and wanted to try out my MSPaint skills [Linked Image]

[Linked Image]


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