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250-32 #77901 07/20/01 07:55 PM
Joined: Dec 2000
Posts: 4,283
electure Offline OP
Member
A neighbor wants to put a 60A subpanel in his detached garage, about 30' from the house. He's doing it himself, has already run a UG 1" conduit with 3 #4, & a #8 EGC.
AHJ said he's required to install another grounding electrode @ the garage, but why?? I don't have a good answer for him.
His reasoning is that if the sub was on the fence, 30' further, it wouldn't be required. I can't argue with that.

2017 / 2014 NEC & Related Books and Study Guides
Re: 250-32 #77902 07/20/01 08:59 PM
Joined: Jan 2001
Posts: 1,044
Tom Offline
Member
Electure,

Perhaps someone with access to the history of the NEC could give you the real "why" behind the code article.

The requirement is in 250-32 and in addition, 2 made electrodes will likely be required since this installation must still comply with 250-56.


Few things are harder to put up with than the annoyance of a good example.
Re: 250-32 #77903 07/20/01 09:43 PM
Joined: Oct 2000
Posts: 5,389
S
sparky Offline
Member
why?
i ask that a lot too.

why can i run a 60A single circuit to my shed a mile away to weld with, and not do 2 G-rods?

why can i run a 4-wire 1/4 mile in the same building and not do G-rods?

why should i run a 3-wire 10' to an outbuilding and reground with 2 G-rods in close proximity to the serving buildings G-rods ( read into this, I double-dog dare ya!)

why does a disco rate more 'lighting protection" 30' from a mobiler home , that the home itself?

why is 'voltage gradient' not univerasl?

why?

Re: 250-32 #77904 07/21/01 06:47 PM
Joined: Mar 2001
Posts: 2,056
R
Redsy Offline
Member
Quote
Originally posted by sparky:
why?
i ask that a lot too.

why can i run a 60A single circuit to my shed a mile away to weld with, and not do 2 G-rods?

why can i run a 4-wire 1/4 mile in the same building and not do G-rods?

why should i run a 3-wire 10' to an outbuilding and reground with 2 G-rods in close proximity to the serving buildings G-rods ( read into this, I double-dog dare ya!)

why does a disco rate more 'lighting protection" 30' from a mobiler home , that the home itself?

why is 'voltage gradient' not univerasl?

why?


Reminds me of the philosophy student who got an A+ on the final exam.
The only question on the exam was "Why?"
His answer---"Why not?"

Re: 250-32 #77905 07/21/01 08:34 PM
Joined: Oct 2000
Posts: 5,389
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sparky Offline
Member
it may as well be philsophical, for lack of rationale.....maybe someone would be kind enough to follow thru on Tom's suggestion.

Re: 250-32 #77906 07/22/01 07:50 PM
Joined: Jun 2001
Posts: 642
N
nesparky Offline
Member
most inspectors call sheds, detached garages and light poles "seperate structures" Has nothing to do with actual electrical theory.


ed
Re: 250-32 #77907 07/23/01 01:31 AM
Joined: Oct 2000
Posts: 3,961
Bill Addiss Offline
Member
nesparky,

It's interesting that you mentioned light poles. I've heard this before, is that true?

Do they require Gr rods at every pole location?

Bill


Bill
Re: 250-32 #77908 07/23/01 08:15 AM
Joined: Nov 2000
Posts: 2,148
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resqcapt19 Offline
Member
The issue of a light pole being a structure has not be specifically addressed in the NEC. The was a code change in the 93 or 96 code in 225-32 to address this issue as far as a disconnecting means at a light pole. It seams that some inspectors, based on calling a light pole a structure, were requiring a disconnect at each pole (structure). 225-32 Exception #3 was added to say that a tower or pole used as a lighting standard can have its disconnect located elsewhere. Maybe we need the same type of exception in 250-32.
Don(resqcapt19)


Don(resqcapt19)
Re: 250-32 #77909 07/23/01 07:50 PM
Joined: Dec 2000
Posts: 4,283
electure Offline OP
Member
Come to find out, the subject of my original Q has been absolutely dissected (in gargantuan proportions)in other BB's, without a final consensus in any of them.
It seems like this really needs to be addressed by the CMP, although I don't really know how they would/could reword it.
Any ideas?


[This message has been edited by electure (edited 07-23-2001).]

Re: 250-32 #77910 07/24/01 04:14 AM
Joined: Oct 2000
Posts: 5,389
S
sparky Offline
Member
elecuture,
i would say that looking at what our nieghbors do would be a good start.

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