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Joined: Mar 2003
Posts: 849
Y
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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
Joined: May 2005
Posts: 984
G
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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
Joined: Mar 2003
Posts: 849
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So with the Chart 3/0 is the Size to the water line.

Joined: Mar 2003
Posts: 849
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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.

Joined: Jul 2004
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G
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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
Joined: Apr 2002
Posts: 7,283
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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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