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#69469 - 09/10/06 07:10 AM Grounding conductor
CDS Offline
Member
Registered: 06/28/06
Posts: 34
Loc: Nicholson Ga
Bidding on small welding shop 400 amp 1 ph
It is a metal butler building , already built on slab , sidewalk poured all the way around . Question is , I can tie ground to steel easily but with slab already poured , and sidewalk , I can't tie to rebar or use ground rods without cutting concrete . any advice would be appreciated .
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#69470 - 09/10/06 09:47 AM Re: Grounding conductor
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9039
Loc: Estero,Fl,usa
I have seen them drill a hole in the concrete for a rod, just bear in mind it has to be 8' in the dirt so the rod needs to be longer than 8'. If you can find a place that is out of the traffic path that may be an option.
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#69471 - 09/10/06 07:29 PM Re: Grounding conductor
Almost Fried Offline
Member
Registered: 09/04/06
Posts: 98
Loc: Madison County, Ark. USA
With the sidewalk already poured does that mean that all the plumbing lines to the street are already roughed in? That would be a readymade route to use if the plumbing is not in. Otherwise, I would use a short length of rigid steel to cross the walk with a kick down on the outside end.
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#69472 - 09/11/06 07:34 AM Re: Grounding conductor
Zapped Offline
Member
Registered: 10/01/02
Posts: 482
Loc: Huntington Beach, CA, USA
I've done this by drilling, as gfretwell suggested. I drilled through the slab with a 7/8 bit (avoiding the 2' footer around the parameter of the building if at all possible) and then drove a 10' copper clad ground rod. If I recall, I even did this with a stainless rod ages ago for one application. Some heavy duty urethane caulk in and around the hole and rod and squeezed into the hole (after you blow it out) is a good touch to avoid water intrusion.

NOTE: Be VERY carefull not to drive the rod anywhere near a possible water or waste run. Carefull note where plumbing fixtures are in relation to your desired rod location BEFORE you even think about drilling and driving. Nobody wants to chip and dig to do a reapir on a sewer line =)
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#69473 - 09/11/06 04:42 PM Re: Grounding conductor
CDS Offline
Member
Registered: 06/28/06
Posts: 34
Loc: Nicholson Ga
Thanks for advice , as simple as it sounds , I never thought of drilling through the slab
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#69474 - 09/12/06 04:34 PM Re: Grounding conductor
ShockMe77 Offline
Member
Registered: 06/11/05
Posts: 821
Loc: Rahway, New Jersey
Almost Fried...

now there's a memorable screen name!
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#69475 - 09/15/06 08:25 PM Re: Grounding conductor
skipr Offline
Member
Registered: 01/03/05
Posts: 39
Loc: Huntington Beach, Ca.
I always drill through the foundation and pound in a 10' rod,I thought this was the common way everyone does it.Takes a couple seconds with a good rotorary hammer.
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