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New tool
by SMOKEYBOB - 02/15/21 04:59 PM
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1 registered members (Scott35),
18
guests, and 17
spiders. |
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Key:
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 ground size
#72994
12/14/06 08:39 PM
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Joined: Oct 2005
Posts: 5
OP
Junior Member
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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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Re: ground size
#72995
12/14/06 09:24 PM
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Joined: Jul 2006
Posts: 272
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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.
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Re: ground size
#72996
12/14/06 10:58 PM
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Joined: Jul 2004
Posts: 9,569
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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
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Re: ground size
#72997
12/14/06 11:23 PM
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Joined: Jul 2006
Posts: 272
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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]](https://www.electrical-contractor.net/ubb/frown.gif)
Luke Clarke
Electrical Planner for TVA.
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Re: ground size
#72998
12/16/06 09:10 PM
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Joined: Mar 2003
Posts: 849
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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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