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 gfretwell. 07/20/17 01:08 PM
600 KW 120/208 3 Phase Y protection
by gfretwell. 07/20/17 01:02 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:
SE cable question
Popular Topics(Views)
239,166 Are you busy
174,551 Re: Forum
166,987 Need opinion
Who's Online Now
0 registered members (), 58 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#72994 - 12/14/06 09:39 PM ground size  
bdonus  Offline
Junior Member
Joined: Oct 2005
Posts: 5
chicago, il
need to know what size groung conductor to use for the main ground to the water pipe for a 1600 amp service with 4 sets of 600 mcm cables to the utility transformer.


Work Gear for Electricians and the Trades

#72995 - 12/14/06 10:24 PM Re: ground size  
Luketrician  Offline
Member
Joined: Jul 2006
Posts: 272
Sale Creek, TN USA
With the information given, table 250.122 shows 4/0 if the egc is copper, or 350 if it's al/cu. 250.122 (F) talks about conductors in parallel also. This should get you started.


Luke Clarke
Electrical Planner for TVA.


#72996 - 12/14/06 11:58 PM Re: ground size  
gfretwell  Online Content


Member
Joined: Jul 2004
Posts: 9,099
Estero,Fl,usa
You use 250.66, not 250.122
I read it as the max required will be 3/0 copper or 250 MCM al.


Greg Fretwell

#72997 - 12/15/06 12:23 AM Re: ground size  
Luketrician  Offline
Member
Joined: Jul 2006
Posts: 272
Sale Creek, TN USA
Thanks, and apologies for the mix-up, 250.122 is for grounding raceway's and equipment. Seen that first part, where it says minimum size egc, and the rest is history. [Linked Image]


Luke Clarke
Electrical Planner for TVA.


#72998 - 12/16/06 10:10 PM Re: ground size  
Yoopersup  Offline
Member
Joined: Mar 2003
Posts: 822
Michigan
If under the Chicago code its 18-27-250.66 page 93
copper (300) in a 1 1/4 inch conduit or tubing.



Member Spotlight
Scott35
Scott35
Anaheim, CA. USA
Posts: 2,707
Joined: October 2000
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.012s Queries: 14 (0.002s) Memory: 0.7671 MB (Peak: 0.9074 MB) Zlib enabled. Server Time: 2017-07-20 18:35:19 UTC