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Joined: Nov 2000
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zapped,
The 20' is the minimum length permitted. You could have a 4' x 4' building. The wording also applies to "stuctures" not just buildings, so the 4' x 4' is not out of the question. I know that the 20' in a ditch would be just as good if not better than a 20' ground ring, it just is a violation of the code wording. A good place for a 2008 proposal.
Don
Don(resqcapt19)
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Joined: Feb 2003
Posts: 939
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ok don thanks for explaining that code now and i hope they can do something in 08 code to clear it. so we can understand the wordings more clear with out more confusing facts
merci marc
Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)
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Joined: Feb 2003
Posts: 198
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Don,- Thanks for your input about this topic and hope to have more discussions in the future about some more grey areas of our NEC. Zapped208
Shoot first, apologize later.....maybe
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Joined: Dec 2002
Posts: 308
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I had the same bedrock problem on my last 400 Amp panel upgrade. I laid in a 3/4"x10' rod along with 40' of bare copper. AHJ approved the installation.
Edward
Thanks
Edward
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Joined: Aug 2002
Posts: 141
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If I lay ground rods in a trench, how do I keep the acorn accessable?
bob
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Joined: Nov 2000
Posts: 2,236 Likes: 1
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Of course, you must try to drive them, first at a 90º angle, then up to a 45º and hit bedrock... When I throw them into a trench, I first find a good solid limestone rock embedded in the soil and tap the rod into it at a 90, declare "Oh, I've hit stone" then tap it at a 45 and declare, "Gosh, I've hit stone again" and then I chuck it into the trench... ![[Linked Image]](https://www.electrical-contractor.net/ubb/biggrin.gif)
-Virgil
Residential/Commercial Inspector
5 Star Inspections
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Joined: Mar 2001
Posts: 333
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Bob, the acorn doesn't need to be accessible, as long as it's listed for burial. With a driven rod, unless you're using a 10' rod, the acorn should be below grade, in order to have 8' of rod in contact with the earth.
Steve
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Joined: Jan 2002
Posts: 1,457
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The acorn can't be left above grade unless protected from damage. By the way the job was inspected today with no problems.
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Joined: Oct 2000
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E-Scott,
was this a barn for animals??
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Joined: Mar 2002
Posts: 360
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I have another question.
Here at the railroad, if we need a long drill bit, we get out the welder, and we make a long drill bit. Would it be legal/kosher to bond a cheap carbide masonary bit to the bottom of yon ground rod, and chuck it up in the Hilti, and go to town? leaving the drill bit at the bottom, hence the reason for using a cheap drill bit.
TW
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