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#61316 - 01/21/06 05:39 AM arcing ground connection
sandro2 Offline
Member
Registered: 03/26/05
Posts: 49
Loc: philadelphia,PA
I went to a house and at the cold waterpipe the ground was arcing against the water pipe.
I checked the neutral at the tap,meter socket and panel all were tight and made sure the neutrals and grounds were tight inside the panel. I tightened the ground connection and it stopped what could be the cause?
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#61317 - 01/21/06 05:42 AM Re: arcing ground connection
iwire Offline
Moderator
Registered: 01/05/03
Posts: 4391
Loc: North Attleboro, MA USA
The problem was a loose connection at the water pipe.

The 'cause' is required by the NEC.

The bonding of multiple services to a common underground water pipe results in current being carried on the water pipes.
_________________________
Bob Badger
Construction & Maintenance Electrician
Massachusetts
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#61318 - 01/21/06 06:22 AM Re: arcing ground connection
sandro2 Offline
Member
Registered: 03/26/05
Posts: 49
Loc: philadelphia,PA
Thanks I just wanted to make sure I wasn't overlooking anything. I ran into this problem once before and it was a losse neutral at the taps along with alittle loose on the water pipe.
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#61319 - 01/21/06 07:06 AM Re: arcing ground connection
Rewired Offline
Member
Registered: 01/01/06
Posts: 558
Loc: Hamilton, Ontario, Canada
I have seen grounds carry current even with the mains to the house open!
Sometimes your ground connection is a path for current should one of your neighbours say have a bad or open neutral somewhere in their service..
A.D
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#61320 - 01/21/06 08:14 AM Re: arcing ground connection
HotLine1 Offline


Member
Registered: 04/03/02
Posts: 6776
Loc: Brick, NJ USA
Sandro:
A posibility also could be a 'bad' neutral connection on the utility side. Had that quite a few times, both OH & BUD.

John
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John
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#61321 - 01/21/06 03:16 PM Re: arcing ground connection
LK Offline
Member
Registered: 01/21/03
Posts: 1429
Loc: New Jersey
Just came back from job plumber left and told homeowner to call electrician, we found loose neutral at service head, cut back. and cleaned, new bug, and we hope the plumber will return.
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#61322 - 01/21/06 06:13 PM Re: arcing ground connection
jdevlin Offline
Member
Registered: 08/07/02
Posts: 402
Loc: welland ontario canada
Bad neutral at a neighboring property could be putting current onto the water pipe and back out your client's neutral.
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#61323 - 01/22/06 11:24 AM Re: arcing ground connection
winnie Offline
Member
Registered: 09/15/03
Posts: 649
Loc: boston, ma
Check for a bad water heater element or another high resistance ground fault. A high resistance ground fault can cause significant current flow and power consumption, without tripping a breaker.

After you tighten the ground connection, it is worth putting a clamp meter on the GEC and flipping breakers to see if some particular circuit is causing the current flow.

-Jon
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