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Ground wire Size to water Line. #218870 12/04/17 11:10 AM
Joined: Mar 2003
Posts: 849
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Yoopersup Offline OP
Member
Question
6 - sets of 4 600 MCM copper to service .
By 250.66
Ground wire size to Water Line?

Calculations Please

2017 / 2014 NEC & Related Books and Study Guides
Re: Ground wire Size to water Line. [Re: Yoopersup] #218871 12/04/17 12:43 PM
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ghost307 Offline
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According to the table, anything larger that 1,100 kcmil requires 3/0 Copper (or 250 kcmil Aluminum).
Since you're running parallel sets, you need to run that size ground wire with each set.

Calculations are:
(6) 600 MCM = 3,600 MCM
3,600 MCM > 1,100 MCM


Ghost307
Re: Ground wire Size to water Line. [Re: Yoopersup] #218872 12/04/17 01:46 PM
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Yoopersup Offline OP
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So with the Chart 3/0 is the Size to the water line.

Re: Ground wire Size to water Line. [Re: Yoopersup] #218873 12/04/17 01:58 PM
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Posts: 849
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Yoopersup Offline OP
Member
A Ground wire does not go with the Conductors . (only Equipment Grounds go with conductors ,)
This is from the Service Panel to the water line.

Re: Ground wire Size to water Line. [Re: Yoopersup] #218874 12/04/17 05:24 PM
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gfretwell Offline
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I read the chart to say 3/0 is the biggest conductor you ever need and I agree the grounding conductor does not need to be run in each set. They are not usually even going to the same place.


Greg Fretwell
Re: Ground wire Size to water Line. [Re: Yoopersup] #218879 12/05/17 01:11 PM
Joined: Apr 2002
Posts: 7,105
HotLine1 Offline
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The water ground is max 3/0 Cu by NEC, however the design professional may spec something larger. Terminations are at the street side of the water main, and on a compliant sized lug within the main OCP enclosure on the neutral buss.

This conductor does not go with the feeder conductors, as others have said


John

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