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"AHJ" says grounding elctrode conductor to long. #49229
03/01/05 10:40 PM
03/01/05 10:40 PM
B
bucketman  Offline OP
Member
Joined: Oct 2004
Posts: 72
vancouver WA, USA.
"AHJ says if grounding elctrode conductor is longer then 100' up size from #4 to a #2."
no code was refferanced.

Why?
what would he be thinking?
has any one seen this in nec 2002 or 2005?

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Re: "AHJ" says grounding elctrode conductor to long. #49230
03/01/05 11:43 PM
03/01/05 11:43 PM
B
Bob  Offline
Member
Joined: Feb 2002
Posts: 182
Mobile, AL, USA
This is not a code problem. Its an engineering problem. If the grounding conductor is too long the impedance may cause a delay in the opening of the breaker. The 100 ft is a rule of thumb. To know if there is a problem you would need to caculate the fault current and check the curves for the breaker. How long is the conductor?

Re: "AHJ" says grounding elctrode conductor to long. #49231
03/02/05 12:05 AM
03/02/05 12:05 AM
B
bucketman  Offline OP
Member
Joined: Oct 2004
Posts: 72
vancouver WA, USA.
Are rules of thumb enforceable violation?
NEC says nothing about rules of thumb, right?
article 250 said nothing about it.
is something wrong with 250.66? No

it's a residence with a 200amp service
4/0 alum
grounding electrode conductor from service to with in 5' of whare water enters the house.
a distance of 85'.

Re: "AHJ" says grounding elctrode conductor to long. #49232
03/02/05 12:08 AM
03/02/05 12:08 AM
B
bucketman  Offline OP
Member
Joined: Oct 2004
Posts: 72
vancouver WA, USA.
check the curves for the breaker?
how do i do that?
what is the curve of a breaker?
are they like a womans curves?

Re: "AHJ" says grounding elctrode conductor to long. #49233
03/02/05 01:39 AM
03/02/05 01:39 AM
G
George  Offline
Member
Joined: Feb 2002
Posts: 375
bucketman ---

The AHJ is asking you to either increase the conductor size or provide engineering showing your size is correct.

While the code may be silent on the issue, I think he is within the spirit of the code.

Re: "AHJ" says grounding elctrode conductor to long. #49234
03/02/05 02:59 AM
03/02/05 02:59 AM
B
bucketman  Offline OP
Member
Joined: Oct 2004
Posts: 72
vancouver WA, USA.
250.66 doesn't seem vary silent.
it seems to be directly to the point.
now I've been doen these service changes for a few years and never had the AHJ call me on the 80 some feet of ground condutor be to long.
i just can't see the AHJ call me for something thats not in the code.

Re: "AHJ" says grounding elctrode conductor to long. #49235
03/02/05 08:04 AM
03/02/05 08:04 AM
R
Roger  Offline
Member
Joined: May 2002
Posts: 1,716
N.C.
Bucketman, I agree with you, as far as the GEC there is no restriction to length as you have said and in fact if the #4 GEC is bare it becomes part of the "Electrode" and the GE's function won't be improved to any great performance level by increasing the conductor size.

With this length of #4 copper in the ground, and if we were talking about a rod, the conductor would probably provide more of a GE than the rod itself.

Bob, the GE and GEC would play no part in the operation of an overcurret device.

Roger



[This message has been edited by Roger (edited 03-02-2005).]

Re: "AHJ" says grounding elctrode conductor to long. #49236
03/02/05 09:22 AM
03/02/05 09:22 AM
R
Ryan_J  Offline
Moderator
Joined: Aug 2003
Posts: 1,374
West Jordan, Utah, USA
I think the AHJ is acting well beyond the scope of his/her authority.


Ryan Jackson,
Salt Lake City
Re: "AHJ" says grounding elctrode conductor to long. #49237
03/02/05 01:04 PM
03/02/05 01:04 PM
B
bucketman  Offline OP
Member
Joined: Oct 2004
Posts: 72
vancouver WA, USA.
ya, talked to the AHJ to day befor I ripped out all that #4 and he said it was just a consern of his that it be up sized.
So the #4 stands...

But next time I'll just pull #2 because its cool.
I do think it's a good wiring practice and a good Idea and it cant heart but the $$$.

"I think the AHJ is acting well beyond the scope of his/her authority."

That was my hole thought. It was a you can't make me thing.

thanks all for the posts. keepem comen.

Re: "AHJ" says grounding elctrode conductor to long. #49238
03/02/05 01:31 PM
03/02/05 01:31 PM
G
George  Offline
Member
Joined: Feb 2002
Posts: 375
1) It is not clear that the GEC is in the ground. I assumed it was not.

2) If there are no real concerns about the length, then the diameter does not matter. And we would not have a table of GEC related to service conductor.

The code is silent on the issue of maximum length of the GEC before meeting the grounding electrode.

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