ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Lowes Selling this fan
by timmp - 07/25/21 10:58 PM
How's all our Non-US folks doing?
by djk - 07/23/21 09:13 PM
Switched Receptacles -Top or Bottom?
by donles - 07/23/21 10:51 AM
Do You Travel?
by Bill Addiss - 07/20/21 04:26 PM
Backup Generator Done Right
by timmp - 07/18/21 12:20 PM
New in the Gallery:
February, North East Indiana
February, North East Indiana
by timmp, July 25
Red Green would be proud
Red Green would be proud
by timmp, July 25
Who's Online Now
1 members (NORCAL), 26 guests, and 15 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#90583 12/01/04 12:30 AM
Joined: Nov 2004
Posts: 1
T
Junior Member
This is not a code issue but I don't know who to ask. I am a small electrical contractor in Houston, TX. In my 46 years in the trade I haven't done much residential work, just for friends and family.

I recently built a second residence in an un-incorporated area in the Texas hill country between Austin and San Antonio. There is no inspection of any kind. I had a builder build the house but did my own electrical. The builder and all the subconractors did an excellent job. I drove a ground rod on my 225 amp service and bonded to the cold water pipe. The water pipe is PVC up to the house then copper in the fill under the slab. The hot water pipes are copper and run in the slab also except on the second floor. I was even planning to bond the cold water to the hot water at the electric hot water heater. A friend of mine up there got shocked in the shower when the hot water heater element went out.

In that area of Texas builders use a real fine crushed limestone for fill since there is no bank sand available. The builder jumped on me for bonding to the cold water pipe, that it caused electrolysis. I asked the plumber his opinion and he said he thought it did too.

I told them I thought a water pipe ran in this semi-moist (maybe) limestone fill would not be able to make up its mind whether it was at ground potential or not and if I bonded it to ground I thought there would be less chance of elctrolysis than if I didn't. They are not convinced but I am still bonded to the cold water pipe.

I don't know of any experts on this subject. Can you either advise or recommend someone to talk to?

Tom Fitch

2017 / 2014 NEC & Related Books and Study Guides
#90584 12/01/04 08:33 AM
Joined: Jan 2004
Posts: 1,507
G
Member
Tom- this is a code issue and I don't know if you are able to have access to a National Electric Code book or not but if you go to the local library and look in the 2002 edition of the National Electric Code Book published by the National Fire Protection Association and look on page 104 and page 110 there is considerable information that would have us grounding to the water piping system and including all piping systems, on the premise. As for electrolysis, you will have that whether or not you hook your ground wire up to the piping since electrolysis is a DC phenomenon. You might improve the situation if you ground it [Linked Image] The well drillers quite often use that as an excuse for not allowing the electrician to ground the submerged water pump. A myth at best.

[This message has been edited by George Little (edited 12-01-2004).]


George Little

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Bill Addiss
Bill Addiss
NY, USA
Posts: 4,039
Joined: October 2000
Top Posters(30 Days)
timmp 7
Rachel 4
Popular Topics(Views)
281,535 Are you busy
215,174 Re: Forum
202,017 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5