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#93450 - 05/28/05 03:44 AM Grounding
jes Offline
Member

Registered: 07/12/02
Posts: 103
Loc: CT
Is anyone aware of a jurisdiction where it is NOT common practice to use an underground metal water piping system (where present) as part of the grounding electrode system for a residence and rely soley on a driven rod? Likewise, any jurisdictions where the grounding electrode system is NOT bonded to the interior metal water piping system (where present)?
If so...WHY?

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#93451 - 05/28/05 04:42 AM Re: Grounding
dmattox Offline
Member

Registered: 10/20/04
Posts: 267
Loc: Anaheim, CA
The 2002 code makes it clear that the cold water should be at a minimum be bonded and if 10' of metal in the ground shall be used as a grounding electrode.

250.50 requires that if available each item in 250.52(A)(1)-(6) shall be bonded together. Metal underground pipe is item 250.52(A)(1).

250.104 (A) requires bonding of metal water piping.

So any jurisdiction not using the cold water is violating the NEC. The workbook notes in 250.52(A)(1) that there has always been uncertainty about using the cold water, but that NIST has monitored the issue and found minimal problems.

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#93452 - 05/28/05 05:06 AM Re: Grounding
jes Offline
Member

Registered: 07/12/02
Posts: 103
Loc: CT
Just a P.S. folks, I know that the NEC requirements are...what I am wondering about is local practices that may vary. Thanks!

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#93453 - 05/28/05 05:08 AM Re: Grounding
dmattox Offline
Member

Registered: 10/20/04
Posts: 267
Loc: Anaheim, CA
Yes I know you know, I was just stating what the people would be violating if they didnt bond the metal water. Its very clear from the NEC to do so, so I don't think anywhere would say you shouldnt. Everywhere in SoCal you have to bond the cold water.

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#93454 - 05/28/05 05:31 AM Re: Grounding
Electricmanscott Offline
Member

Registered: 01/12/02
Posts: 1478
Loc: Holden, MA USA
Ther are places that forbid this. Where? I don't know. But I am 100% sure that this is true.

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#93455 - 05/28/05 05:44 AM Re: Grounding
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
I have to go with Scott here, I have read on these forums before that certain water companies forbid using the water supply as a grounding electrode.

Where?

Sorry I do not remember.

Bob
_________________________
Bob Badger
Construction & Maintenance Electrician
Massachusetts

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#93456 - 05/28/05 04:53 PM Re: Grounding
Dnkldorf Offline
Member

Registered: 12/12/04
Posts: 1091
Loc: nowhere usa
Bonding of the metal water pipe is mandatory in the code book, both well water or municipal.

Using it as a ground electrode is not mandatory, code simply states it can be used as an electrode, but must be supplemented if used as an electrode.

At least that is the way I read it..

Dnk......

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#93457 - 05/28/05 05:03 PM Re: Grounding
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
Dnk

 Quote:
250.50 Grounding Electrode System.
If available on the premises at each building or structure served, each item in 250.52(A)(1) through (A)(6) shall be bonded together to form the grounding electrode system. Where none of these electrodes are available, one or more of the electrodes specified in 250.52(A)(4) through (A)(7) shall be installed and used.


As far as the NEC is concerned if a metal water pipe exists on the premises that fits the criteria of 250.52(A)(1) it must be used.

These areas that do not use it are either ignoring or amending the NEC.
_________________________
Bob Badger
Construction & Maintenance Electrician
Massachusetts

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#93458 - 05/31/05 01:52 PM Re: Grounding
Dnkldorf Offline
Member

Registered: 12/12/04
Posts: 1091
Loc: nowhere usa
Iwire,

I am aware of what is states.
It is the wording that throws you off.
250.52 States that a water pipe is PERMISABLE, does not state it is mandatory.

I assume, they do not mean you have to have one or use one, but it is permissable to use it as a ground electrode, if it is supplemented by another ground electrode.

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#93459 - 05/31/05 01:59 PM Re: Grounding
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
 Quote:
250.52 States that a water pipe is PERMISABLE, does not state it is mandatory


250.50 tells us it is mandatory to use each of the items in 250.52 if they are avialable.

It is not a choice.
_________________________
Bob Badger
Construction & Maintenance Electrician
Massachusetts

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