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#72994 - 12/14/06 08:39 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.


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#72995 - 12/14/06 09:24 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 10:58 PM Re: ground size  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,140
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 - 12/14/06 11:23 PM 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 09:10 PM Re: ground size  
Yoopersup  Offline
Member
Joined: Mar 2003
Posts: 840
Michigan
If under the Chicago code its 18-27-250.66 page 93
copper (300) in a 1 1/4 inch conduit or tubing.



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