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ground size #72994
12/14/06 09:39 PM
12/14/06 09:39 PM
B
bdonus  Offline OP
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
Re: ground size #72995
12/14/06 10:24 PM
12/14/06 10:24 PM
L
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.

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

Member
Joined: Jul 2004
Posts: 9,225
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
Re: ground size #72997
12/15/06 12:23 AM
12/15/06 12:23 AM
L
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.

Re: ground size #72998
12/16/06 10:10 PM
12/16/06 10:10 PM
Y
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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