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#211878 - 11/20/13 12:15 AM Common EGC for circuits in PVC raceway  
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
Michigan USA
Can I use the same EGC for running a 20a 120v.circuit and a 20a 277v. circuit in a PVC raceway? Code reference please if available.


George Little

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#211881 - 11/20/13 02:26 AM Re: Common EGC for circuits in PVC raceway [Re: George Little]  
sparkyinak  Offline
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Joined: Jul 2007
Posts: 1,327
Alaska
Yup


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#211884 - 11/20/13 03:50 AM Re: Common EGC for circuits in PVC raceway [Re: George Little]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,118
Estero,Fl,usa
If they are coming from the same service I think a single #12 would do it. 250.122(C)


Greg Fretwell

#211886 - 11/20/13 01:47 PM Re: Common EGC for circuits in PVC raceway [Re: George Little]  
twh  Offline
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Joined: Mar 2004
Posts: 918
Regina, Sask.
Can you run circuits from two different panels in the same conduit?


#211888 - 11/20/13 04:13 PM Re: Common EGC for circuits in PVC raceway [Re: George Little]  
Steve T  Offline
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Joined: Feb 2001
Posts: 306
Oak Park, IL, USA
Up to 600v you can combine circuits of different systems in the same raceway provided they are all insulated for the highest voltage-- 300.3(C).

Since a metal raceway would be allowed as the EGC for the 120v and 277v circuits, and I find no language that prohibits it, a single conductor EGC would be allowable as well. Circuitwise, the pipe and conductor work the same way.


#211890 - 11/20/13 07:34 PM Re: Common EGC for circuits in PVC raceway [Re: George Little]  
George Little  Offline
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Joined: Jan 2004
Posts: 1,489
Michigan USA
The issue seems to be, if you are coming out of two different panels, which you would be, is it proper or necessary to make a three wire splice of the ECG at the common J-box and run a separate wire from there to each panel. I say yes.


300.3(b)


George Little

#211891 - 11/20/13 08:09 PM Re: Common EGC for circuits in PVC raceway [Re: George Little]  
HotLine1  Offline


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Joined: Apr 2002
Posts: 6,864
Brick, NJ USA
George:
It sounds like you have a EGC with each circuit, going to the j-box, correct?

Then, IMHO, all the EGCs should be spliced together at that point.


John

#211892 - 11/20/13 08:11 PM Re: Common EGC for circuits in PVC raceway [Re: George Little]  
George Little  Offline
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Joined: Jan 2004
Posts: 1,489
Michigan USA
That's correct John, and I believe that the way it should be.


George Little

#211898 - 11/20/13 10:13 PM Re: Common EGC for circuits in PVC raceway [Re: George Little]  
Steve T  Offline
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Joined: Feb 2001
Posts: 306
Oak Park, IL, USA
If you had a metal raceway, that's the way it would be too, so I had imagined it the same way you are describing. If you ran separate EGCs for the whole run, you'd still have to bond them to the metal boxes, so they would be bonded together at that common point anyways.


#211917 - 11/23/13 12:26 AM Re: Common EGC for circuits in PVC raceway [Re: HotLine1]  
sparkyinak  Offline
Member
Joined: Jul 2007
Posts: 1,327
Alaska
One grounding conductor per conduit sized for the largest circuit within the conduit Doesn't matter if its six different systems in it. Only exeception is isolated grounding. In a ground fault in a properly grounded system the fault will go back to the panel with that supplied the fault. Each service if grounded properly is bonded together for zero potential. So no one becomes a bonding jumper themselves


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