ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Furnace igniter leaking noise to stereo
by geoff in UK. 05/23/18 01:18 PM
Opinions Please
by Keith_Mc. 05/23/18 09:22 AM
Quickbooks
by Keith_Mc. 05/23/18 09:19 AM
Accounting
by Keith_Mc. 05/23/18 09:16 AM
Don't you buy this stuff
by gfretwell. 05/23/18 01:41 AM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 37 guests, and 9 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
supplemental grounding electrode #97487
02/22/06 08:55 PM
02/22/06 08:55 PM
G
gserve  Offline OP
Member
Joined: Mar 2003
Posts: 92
1)When a ufer ground is installed is a supplemental electrode required? (2) If one is required do I need 2 rods and do they have to be 6' min away from each other and the foundation?(as this is used for an electrode)(3)Can the #4 grounding electrode conductor be run through bored holes in the 2x10's to the panel?

2017 / 2014 NEC & Related Books and Study Guides
Re: supplemental grounding electrode #97488
02/22/06 09:31 PM
02/22/06 09:31 PM
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
I remember reading Mr. Ufer's reports on his grounding electrode. Under extremely adverse conditions, his method always performed far better than the 25 ohms code calls for. This was confirmed by Max Macomb, in his documentation that finally persuaded the code panels to accept the "Ufer ground."

If you're measuring over 25 ohms, I would suspect a problem with the measurement method.

But, there is no rule agains adding an electrode if you want to....but it needs to be six feet, or more, from the Ufer...which, in this case, means the entire slab. With a "Ufer," your slab is the electrode- not just that little copper wire!

While many measure the resistance of the ground by simply sticking their meter probe in the dirt....there has to be a reason for those pricey clamp-on meters, and other fancy equipment, used to measure grounding impedence.

Re: supplemental grounding electrode #97489
02/22/06 09:47 PM
02/22/06 09:47 PM
HotLine1  Online Content

Member
Joined: Apr 2002
Posts: 6,965
Brick, NJ USA
Gserve:
In NEW construction, where a footing/foundation is being installed...it is mandatory that a Ufer be installed.

With a Ufer, no supplemental electrodes are required. (You may if you choose; they must be bonded together)

Yes, you may route the GEC thru wood framing.

As to the 'spacing'; IF you install, 6' spacing, like Reno stated above.

PS: You also have to 'bond' the water piping, jump the meter, bond the H&C at the wtr htr, etc.

John


John

Featured:

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

 

Member Spotlight
sbi
sbi
indiana
Posts: 47
Joined: March 2008
Show All Member Profiles 
Top Posters(30 Days)
twh 12
Popular Topics(Views)
246,882 Are you busy
184,227 Re: Forum
173,461 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.025s Queries: 14 (0.004s) Memory: 0.9518 MB (Peak: 1.0771 MB) Zlib enabled. Server Time: 2018-05-23 20:34:52 UTC