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#20305 - 01/13/03 11:13 AM Residential grounding system question  
wageoghe  Offline
Member
Joined: Feb 2002
Posts: 22
Huntsville, AL
I am a homeowner, not an electrician.

Within the next couple of months, I will be having some foundation underpinning work done on my house. It will consist of 5 or 6 piers 12 feet deep and about 12 inches or so in diameter. Also within the next couple of months I will be getting a new service panel. The piers will be on the same side of the house as the service panel.

Our water supply comes in through PVC, so I anticipate that the new service panel will be grounded via ground rod(s).

Is it worth the effort to try to have the grounding system for the new service panel tied in with the foundation piers? From what I have read this will require some effort on the foundation contractor's and/or the electrician's part to ensure that the rebar in the piers are installed such that then can be used in a grounding system.

When I spoke to the electrician about the new service panel I mentioned that we were having the foundation work done. He indicated that he didn't think that there would be much benefit ( perhaps in a strict cost-to-benefit sense ) to trying to do this.

Thanks for any information.


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#20306 - 01/13/03 01:58 PM Re: Residential grounding system question  
mj  Offline
Member
Joined: Jun 2002
Posts: 186
meriidian, ms
the footing steel sould be used "if available" all of the electrodes must be bonded together as per 250.50 2002 nec


#20307 - 01/13/03 02:41 PM Re: Residential grounding system question  
ElectricAL  Offline
Member
Joined: Oct 2001
Posts: 597
Minneapolis, MN USA
The foundation piers will give you a substantial ground. The new service will be required to have a grounding electrode and a supplemental grounding electrode.

To put the ground in the piers you will need to commit to a service size in order to size the electrical work in the piers.

You will also need to have the piers inspected by the local electrical inspector before the concrete can be poured.

Al


Al Hildenbrand

#20308 - 01/13/03 05:22 PM Re: Residential grounding system question  
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,306
5 or 6 12 ft deep points of earth contact would be better than a few ground rods.

Especially if those 'footers' are used, more ground contact.

More earh contact is a good thing.....usually.

I don't see a big expense, but i do see some trade coordination to accomplish this.



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