ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Recent Posts
Underground phone and coax depth?
by libellis - 02/08/23 08:38 PM
Al Hildenbrand - Minneapolis - obituary
by Bill Addiss - 02/03/23 07:38 PM
by renosteinke - 01/27/23 09:52 PM
Does NEC 551.71 (F) apply to dwellings?
by BigB - 01/20/23 10:46 AM
New in the Gallery:
Burger King crown sillyness
Burger King crown sillyness
by wa2ise, December 11
240/208 to a house
240/208 to a house
by wa2ise, October 9
Who's Online Now
0 members (), 23 guests, and 18 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Joined: Mar 2003
Posts: 849
6 - sets of 4 600 MCM copper to service .
By 250.66
Ground wire size to Water Line?

Calculations Please

Stay up to Code with the Latest NEC:

2020 NEC & Related Reference & Study Guides
2020 NEC & Related Reference & Study Guides
Pass Your Exam the FIRST TIME with these Exam Prep Combos:

>> Master Electrician Exam Prep     >> JourneyMan Electrician Exam Prep

Joined: May 2005
Posts: 984
Likes: 1
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

Joined: Mar 2003
Posts: 849
So with the Chart 3/0 is the Size to the water line.

Joined: Mar 2003
Posts: 849
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
Posts: 9,791
Likes: 14
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: 7,333
Likes: 7
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


Link Copied to Clipboard

Tools for Electricians
Tools for Electricians

* * * * * * *
2023 National Electrical Code (NEC)
2023 NEC Now Available!
* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman


Member Spotlight
Sebago, ME, USA
Posts: 109
Joined: January 2005
Top Posters(30 Days)
triple 2
Popular Topics(Views)
303,310 Are you busy
232,267 Re: Forum
217,023 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5