ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 11
Recent Posts
1913 American Electrician's Handbook
by annemarie1. 07/27/17 03:10 PM
600 KW 120/208 3 Phase Y protection
by Yooperup. 07/24/17 12:20 PM
Green House wiring
by ghost307. 07/20/17 09:10 AM
Permit Snafus...AHJs and Contractors Jump in
by HotLine1. 07/18/17 08:06 PM
New in the Gallery:
Housebilding DIY wiring
Popular Topics(Views)
239,374 Are you busy
174,828 Re: Forum
167,220 Need opinion
Who's Online Now
0 registered members (), 59 guests, and 4 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
Page 1 of 2 1 2
#90778 - 12/10/04 08:45 PM Ufer  
jsherrard  Offline
Member
Joined: Jul 2004
Posts: 19
As I understand, the 05 NEC will now require the steel in the concrete slab to be connected to the other available grounding electrodes. This is something that I have not had to do before, but is being required on a job I am presently bidding. I searched some of the other posts to the ECN forums and several mentioned having the footing contractor stub up a piece of rebar to connect the GEC. How and where should this connection be made. I typically run the GEC from the ground rod up the exterior face of the building into the meterbase or CT cabinet. Could the rebar be stubbed up so as to be outside the building? Should it be inside the building? What type of connector or connection is used to attach the #4 copper GEC? Mechanical? Exothermic?


2017 / 2014 NEC & Related Books and Study Guides

#90779 - 12/10/04 10:17 PM Re: Ufer  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,099
Estero,Fl,usa
Around here they turn up the rebar into a block core and paint the block green so it doesn't get poured solid when they pour the doweled cells. (a Florida thing)
This gets a blank cover on it on the outside and they fish the #4 down to it from the panel. Use an acorn.
A more elegant solution is to hook the #4 directly to the rebar in the footer and hope nobody breaks it before you set the panel.


Greg Fretwell

#90780 - 12/13/04 05:25 PM Re: Ufer  
jkraft  Offline
Member
Joined: May 2003
Posts: 74
excuse the ignorance, but what does Ufer stand for?


#90781 - 12/13/04 06:08 PM Re: Ufer  
rmiell  Offline
Member
Joined: Nov 2000
Posts: 242
La Junta, Co. USA
It stands the H. G. Ufer, who wrote a paper on an installation of a made ground electrode on 24 buildings in Arizona. The installation met a 5 ohms maximum value. the year was 1942.

From his tests and papers, the CMP accepted into code the "Ufer" type of electrode.

Rick Miell


#90782 - 12/13/04 06:43 PM Re: Ufer  
Ryan_J  Offline
Moderator
Joined: Aug 2003
Posts: 1,374
West Jordan, Utah, USA
Just a small point here, but in your original post, you used the term "available". That is exactly what the change for the 2005 is...removing the words "if available" and replacing them with "if present". In regards to your question, the connection can be mechanical with listed fittings (there are some different types available), or you could do it exothemically if you really wanted to.


Ryan Jackson,
Salt Lake City

#90783 - 12/13/04 07:32 PM Re: Ufer  
jsherrard  Offline
Member
Joined: Jul 2004
Posts: 19
What about the benefits / drawbacks of stubbing the steel up either inside the wall cavity (seems like the connection would be better protected from corrosion and could be made accessible) or just outside the exterior face of the wall (easier to run the GEC up into the meterbase). Any thoughts?


#90784 - 12/13/04 07:37 PM Re: Ufer  
RickG  Offline
Member
Joined: Jul 2001
Posts: 37
South County, R.I. USA
I do not think that an acorn connector is rated for rebar. There are other rated types of connectors, one that resembles a water pipe clamp, and another parallel type of clamp/connector. Both are rated for rebar & concrete encasement.
Rick


#90785 - 12/13/04 07:45 PM Re: Ufer  
Ryan_J  Offline
Moderator
Joined: Aug 2003
Posts: 1,374
West Jordan, Utah, USA
I would say keep it inside, for reasons that you describe. [Linked Image]


Ryan Jackson,
Salt Lake City

#90786 - 12/14/04 01:25 PM Re: Ufer  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,099
Estero,Fl,usa
Ilsco specifically says #5 rebar in the description of the BGRC-58
It better be legal or there are a few million homes in Florida that are in violation. This is the standard way to install a Ufer and Ufer is the electrode of choice here.

http://ebusiness.ilsco.com/webapp/w...gId=-1&catalogId=1&categoryId=89


Greg Fretwell

#90787 - 12/21/04 04:48 PM Re: Ufer  
jsherrard  Offline
Member
Joined: Jul 2004
Posts: 19
I have searched the web for mechanical grounding connectors that are listed for use with rebar. Of the few that I found that specifically mention rebar, the description stated that they comply with UL 467. I don't see any other listing that differentiates them. Does anyone know if all mechanical grounding connectors that comply with UL 467 can properly be used to attach a GEC to rebar?


Page 1 of 2 1 2

Member Spotlight
togol
togol
NW In. USA
Posts: 421
Joined: September 2005
Show All Member Profiles 
Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.023s Queries: 15 (0.003s) Memory: 0.8172 MB (Peak: 0.9897 MB) Zlib enabled. Server Time: 2017-07-28 17:03:36 UTC