ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
220/230/240V 60Hz Systems
by gfretwell. 09/16/18 12:37 PM
Acronis Backup 2017
by gfretwell. 09/16/18 12:46 AM
Inspection camera help
by Bill Addiss. 09/15/18 11:32 AM
Tingle off the water spigot
by Trumpy. 09/15/18 03:24 AM
Lighting Load questions
by HotLine1. 09/14/18 07:04 PM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 7 guests, and 21 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
UFER ? #77546
06/20/01 10:19 PM
06/20/01 10:19 PM
electure  Offline
OP
Member
Joined: Dec 2000
Posts: 4,274
Fullerton, CA USA
In 2 cities right next to each other, Ufers are required to be installed in 2 different ways. One inspector wants the Cu tie wired right to the rebar. The other wants the Cu totally away from the rebar in the footing, but bonded together above the slab. Up until now I just have tried to remember which guy's city I'm working in.
Who's right???

[This message has been edited by electure (edited 06-20-2001).]

2017 / 2014 NEC & Related Books and Study Guides
Re: UFER ? #77547
06/20/01 10:53 PM
06/20/01 10:53 PM
A
Anonymous
Unregistered

I think Ufer himself allowed the copper to be under the concrete. But in a wet area, the copper could possibly corrode away.

The place that is right is the one that requires a stainless steel rod to be welded to the rebar and left sticking out for the purpose of attaching the copper GEC.

Re: UFER ? #77548
06/21/01 06:31 AM
06/21/01 06:31 AM
S
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,360
what is the rationale? is the voltage gradient affected either way?

Re: UFER ? #77549
06/21/01 01:25 PM
06/21/01 01:25 PM
W
WARREN1  Offline
Member
Joined: May 2001
Posts: 176
Greenville, SC, USA
Searched "Ufer" and got an article published by Chris Scott in December of 1989 in Radio World magazine. According to the article, Mr. Ufer's findings were published in IEEE Transaction paper #63-1505.
"After much research and testing Mr. Ufer advised the Army to make connection to the steel bar that would internally reinforce the concrete foundation. He had determined that concrete was more conductive than all but the best soil, and that this improved semiconducting characteristic would enhance surface area contact with the surrounding soil. The wire ties normally used would be extra secure, and attention would be given to bonding or welding the lattice- type network together." We use this type system often doing design. The cage is wired together and a piece of CU is brought out to the steel column. This is all tied to the building ground loop, etc, to have a better than adequate grounding system.


Featured:

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

 

Member Spotlight
NickD
NickD
Amish Country, PA
Posts: 46
Joined: March 2013
Show All Member Profiles 
Top Posters(30 Days)
Admin 13
Trumpy 11
sparky 11
Popular Topics(Views)
249,264 Are you busy
187,194 Re: Forum
176,547 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.014s Queries: 14 (0.003s) Memory: 0.9573 MB (Peak: 1.0907 MB) Zlib enabled. Server Time: 2018-09-18 19:27:39 UTC