ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Changing a Bulb
by mbhydro. 07/21/18 05:57 PM
Opinions & comments
by HotLine1. 07/21/18 04:44 PM
Tray cable?
by gfretwell. 07/11/18 10:18 PM
Eaton Heavy Duty 30A and 60A Safety Switches
by Admin. 07/11/18 09:49 PM
ORTOVOX Recalls Avalanche Transceivers
by Admin. 07/11/18 09:44 PM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 17 guests, and 22 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
grounding electrode conductor #100787
01/02/07 11:39 PM
01/02/07 11:39 PM
T
triple  Offline OP
Member
Joined: Apr 2002
Posts: 184
Wisconsin
250.56 and 250.64(F):
If 25 ohms or less is not achieved with one ground rod, and a second one is added, do the two need to be tied together with the same continuous wire back to the common bonding point (panel)? I realize that an irreversible connection could be used but is there any reason that a separate wire couldn't be run from each of the two rods back to the panel? BTW, Wisconsin requires two ground rods no matter what.

2017 / 2014 NEC & Related Books and Study Guides
Re: grounding electrode conductor #100788
01/02/07 11:52 PM
01/02/07 11:52 PM
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
The first rod is your "grounding electrode." The second is a "supplementary electrode" It can be attached with a separate wire to the first rod.

Re: grounding electrode conductor #100789
01/03/07 06:28 PM
01/03/07 06:28 PM
T
triple  Offline OP
Member
Joined: Apr 2002
Posts: 184
Wisconsin
If the first electrode does not meet the 25 ohm maximum requirement then the second electrode is not simply a "supplementary grounding electrode" is it? Also, since Wisconsin requires two in every case then the second one would never be supplimental (imo). Renosteinke, are you suggesting that the wire from the second rod can be simply bolted to the first rod without an irreversible connection to the first rod's conductor? How about 250.64(C)?

Thank you.

Re: grounding electrode conductor #100790
01/03/07 06:47 PM
01/03/07 06:47 PM
I
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
Triple, the conductor from one electrode to another is not a GEC.

The GEC runs from the panel to some point of the grounding electrode system.

The conductors that connect multiple grounding electrodes together are bonding jumpers. 250.64(C) does not apply to these bonding jumpers.

Here is a picture from the handbook showing different ways of connecting the grounding electrode system together.

[Linked Image]


Bob Badger
Construction & Maintenance Electrician
Massachusetts
Re: grounding electrode conductor #100791
01/04/07 09:36 AM
01/04/07 09:36 AM
R
Ryan_J  Offline
Moderator
Joined: Aug 2003
Posts: 1,374
West Jordan, Utah, USA
Jon, the second rod would be supplemental, not supplementary.


Ryan Jackson,
Salt Lake City

Featured:

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

 

Member Spotlight
sparky66wv
sparky66wv
West Virginia
Posts: 2,236
Joined: November 2000
Show All Member Profiles 
Top Posters(30 Days)
Admin 5
Popular Topics(Views)
248,158 Are you busy
185,632 Re: Forum
174,999 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.022s Queries: 14 (0.003s) Memory: 0.9685 MB (Peak: 1.1073 MB) Zlib enabled. Server Time: 2018-07-22 12:31:20 UTC