The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
Wow, that was close!
by jraef
11/28/16 07:06 PM
Earthquake in New Zeeland
by RODALCO
11/27/16 11:25 PM
Calling all Non-US members!! (Non-US only)
by Tjia1981
11/27/16 06:33 AM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 14
HotLine1 10
Trumpy 8
Texas_Ranger 8
sparkyinak 7
Who's Online
0 registered (), 214 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#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 .

Top
Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#69470 - 09/10/06 09:47 AM Re: Grounding conductor
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
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.
_________________________
Greg Fretwell

Top
#69471 - 09/10/06 07:29 PM Re: Grounding conductor
Almost Fried Offline
Member

Registered: 09/04/06
Posts: 104
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.

Top
#69472 - 09/11/06 07:34 AM Re: Grounding conductor
Zapped Offline
Member

Registered: 10/01/02
Posts: 481
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 =)

Top
#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

Top
#69474 - 09/12/06 04:34 PM Re: Grounding conductor
ShockMe77 Offline
Member

Registered: 06/11/05
Posts: 823
Loc: Rahway, New Jersey
Almost Fried...

now there's a memorable screen name!

Top
#69475 - 09/15/06 08:25 PM Re: Grounding conductor
skipr Offline
Member

Registered: 01/03/05
Posts: 41
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.

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals