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#95495 - 09/16/05 09:45 PM EGC for 4 subpanels.  
Edward  Offline
Member
Joined: Dec 2002
Posts: 308
California
I finished a fourplex four meter pack with four disconnects on one enclosure.And i have four 60Amp feed through one conduit to each subpanel that are installed side by side in a 36"x48" enclosure. I have pulled only one #10 EGC that is being daisy chained from one panel to the next.
I have a feeling that i need four #10EGC.
Am I correct?

Please show NEC reference because i can not find it.

Thank you
Edward


Thanks
Edward

2017 / 2014 NEC & Related Books and Study Guides

#95496 - 09/16/05 10:28 PM Re: EGC for 4 subpanels.  
watersparkfalls  Offline
Member
Joined: Mar 2005
Posts: 220
Washington...Not DC
And i have four 60Amp feed through one conduit to each subpanel that are installed side by side in a 36"x48"

what kind of raceway?

h20


#95497 - 09/16/05 10:59 PM Re: EGC for 4 subpanels.  
Edward  Offline
Member
Joined: Dec 2002
Posts: 308
California
One EMT conduit with four "C" conduilets that feed each panel separately. It is not a through feed installation.
I will try to submit picture.

Thanks
Edward


Thanks
Edward

#95498 - 09/16/05 11:07 PM Re: EGC for 4 subpanels.  
Larry Fine  Offline
Member
Joined: Feb 2005
Posts: 693
Richmond, VA
Ed, the EMT itself should qualify as the EGC for each panel. Otherwise, yes, each feeder should have its own EGC, I believe.


Larry Fine
Fine Electric Co.
fineelectricco.com

#95499 - 09/17/05 06:47 AM Re: EGC for 4 subpanels.  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
One EGC for all the circuits is OK.

Quote
250.122(C) Multiple Circuits. Where a single equipment grounding conductor is run with multiple circuits in the same raceway or cable, it shall be sized for the largest overcurrent device protecting conductors in the raceway or cable.


Not sure the power company will be happy with the feeders from 4 different meters to all be in the same conduit.



[This message has been edited by iwire (edited 09-17-2005).]


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#95500 - 09/17/05 07:33 AM Re: EGC for 4 subpanels.  
techie  Offline
Member
Joined: May 2005
Posts: 246
palo alto, ca usa
I don't know why the power company would care, since the feeders are all downstream of the main OCP. The AHJ might care, but I don't see any real issues with it.


#95501 - 09/17/05 07:43 AM Re: EGC for 4 subpanels.  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
Power theft would be the power company's issue.


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#95502 - 09/17/05 12:28 PM Re: EGC for 4 subpanels.  
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
I think 250.24(C) is the section we want.

As I read it, you are only required to have on GEC (wire to a ground rod). The utility neutral, however, must be bonded to the case of each of the disconects- so the egc will terminate to the neutral buss at each disconnect as well.


#95503 - 09/17/05 12:33 PM Re: EGC for 4 subpanels.  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
Reno I believe the GEC would be at the meter stacks with the service disconnect(s) the wires in the EMT are feeders not service conductors. [Linked Image]


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#95504 - 09/17/05 07:12 PM Re: EGC for 4 subpanels.  
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
I agree, Iwire.....I only brought up the GEC as this is the sort of application where things get confused easily. After all, there is the question of what to do with the EGC once it reaches the panel.



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