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#61316 - 01/21/06 09:39 AM arcing ground connection  
sandro2  Offline
Member
Joined: Mar 2005
Posts: 49
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 09:42 AM Re: arcing ground connection  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
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

#61318 - 01/21/06 10:22 AM Re: arcing ground connection  
sandro2  Offline
Member
Joined: Mar 2005
Posts: 49
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.


#61319 - 01/21/06 11:06 AM Re: arcing ground connection  
Rewired  Offline
Member
Joined: Jan 2006
Posts: 558
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


#61320 - 01/21/06 12:14 PM Re: arcing ground connection  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,824
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


John

#61321 - 01/21/06 07:16 PM Re: arcing ground connection  
LK  Offline
Member
Joined: Jan 2003
Posts: 1,429
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.


#61322 - 01/21/06 10:13 PM Re: arcing ground connection  
jdevlin  Offline
Member
Joined: Aug 2002
Posts: 402
welland ontario canada
Bad neutral at a neighboring property could be putting current onto the water pipe and back out your client's neutral.


#61323 - 01/22/06 03:24 PM Re: arcing ground connection  
winnie  Offline
Member
Joined: Sep 2003
Posts: 649
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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