ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Recent Posts
VFD MotorFeeders
by gfretwell. 10/19/17 01:02 AM
Generator Cable Sizing
by brsele. 10/18/17 07:39 PM
What do you do?
by gfretwell. 10/17/17 01:08 AM
Good ol' copper pipe in the fuse holder trick
by HotLine1. 10/16/17 07:16 PM
Another generator question
by HotLine1. 10/16/17 07:02 PM
New in the Gallery:
Gallery Test
Popular Topics(Views)
241,444 Are you busy
177,423 Re: Forum
169,010 Need opinion
Who's Online Now
0 registered members (), 14 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#16465 - 11/11/02 11:03 PM Driven Rod?  
arseegee  Offline
Joined: Jan 2002
Posts: 324
Statesboro, GA USA
On a job that has 1200A 208Y service CT can at xfmr. I have a copper water pipe ground and steel structure ground. My GEC shall be 2/0cu to structure.

My helper(lead man) is wanting to drive several rods to form a grid and take the GEC to the grid I say take it to the structure.

If we drove rods, would the GEC be a #6 as the 2002 code states (250.66)? Or is that for a single rod electrode?

[This message has been edited by arseegee (edited 11-11-2002).]

Work Gear for Electricians and the Trades

#16466 - 11/12/02 02:14 AM Re: Driven Rod?  
nesparky  Offline
Joined: Jun 2001
Posts: 642
Where is the service disco?


#16467 - 11/12/02 06:54 AM Re: Driven Rod?  
sparky  Offline
Joined: Oct 2000
Posts: 5,311
a few issues at hand here arseegee, i can realte to wanting to ground the s#@! outta everything, i think it's simply inherent in us...... [Linked Image]

IMHO,it would seem that providing g-rods to the structure would mimic a lightning rod installation, simply aiding the structure in bleeding off a lightning strike.

in terms of an incomming charge to the service itself, a closer grid is a better grid, lower ohmic value following suit....( all..)

the reduction of GEC size for "sole electrodes" , to my understanding, means they are all run back to the MBJ individually, applicable to all except A-C in 250.66
Assumably Kirchhof's laws apply here to latter charge....

as to the MBJ, ( and this is a tad of a highjack) , i've ended up in 366.7
(1000a per square inch of cu, 700a for al)
wondering about the last sentron unit's intergrity , with tape measure in hand....

Member Spotlight
Bay Area
Posts: 61
Joined: August 2007
Show All Member Profiles 

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: 0.011s Queries: 14 (0.003s) Memory: 0.7513 MB (Peak: 0.8776 MB) Zlib enabled. Server Time: 2017-10-22 11:46:12 UTC