What if all 4 circuits were faulted (unlikely but possible)?
You would want all the available EGCs to help them clear.
What if all 4 circuits were faulted (unlikely but possible)?
You would want all the available EGCs to help them clear.
"Electricity is really just organized lightning." George Carlin
Derek
Er,faults. Post#11
"Electricity is really just organized lightning." George Carlin
Derek
That quote is where I misunderstood where you said "all NM cable originate from the panel and end up in the J box"as to the answer to your question I would say yes, they all would terminate together to the bond jumper if your using the emt as the EGC, or if a separate EGC is pulled in the conduit (you need only one, sized for the largest ocp) all tied to it.
I understand that "can" be done, but it has to be out of sheer ignorance? Sorry, to be blunt about it... but this is a very serious matter? How does one justify the wires' existence? Any chance you could just leave the other wires in the box and have the equipment function properly? Is there not equipment on both ends of that circuit? Why do you think the wires are there to begin with? How can you know the EMT can be used as the EGC, yet think to just leave the NM grounds in the box???
I will have achieved my life's goal if I die with a smile on my face.
I agree sometimes one has to be blunt but I know what the purpose of the EGC and why wires are installed and furthermore agree that the EMT may not be relied on as an EGC.
maybe i didn't explain the situation clearly. The existing conduit with single conductors was from the panel to the loads that i had mention in my OP without an EGC. So when the panel was upgraded the existing conduit couldn't be bent in the wall to enter the new panel, so it was cut and a junction box installed, then that box was fed with NM cable (the NM cable originates from the panel).
So theoretically instead of the NM cables i could have installed EMT to the Jbox without any EGC. So between the panel and the J box, what is the difference between the EMT acting as my EGC vs only one of the EGC from the NM cable?
I hope this is clear.
Edward
The only thing I know, is the progressive discovery of my ignorance
If he had 4 circuits all in same raceway there only needs to be one EGC and it only needs sized to largest overcurrent device protecting conductors in that raceway. Now he has replaced the raceway with 4 separate cables - each with its own EGC. Similar yet different - does each EGC need to be connected even though effectively one would work? I think that is the question the OP is asking. I have not always connected all of them myself when they go to same point on each end, doesn't mean that it was right though.
I was wondering why you had multiple NM cables and then transition to a raceway - usually it is raceway transitioning to cable methods.
I think as long as the #10 is connected in the j-box, the continuity between the emt and the #10 to the panel meets the requirement of 250.148 is meant.
gusco
I commend you for not taking insult by it (or at least not appearing to), and persuing the issue diligently.
Clearer... but for the purpose, it was clear to me before.
Actually, I've heard from other posts on using conduits as an EGC, EMT (properly installed and maintained) is a better EGC than a single #10 copper wire. Because it is in essence redundant grounding, the code allows a single EGC run in a conduit with multiple circuits. Nevertheless, a single #10 in a non-metallic wiring method is not equivalent to just EMT, and definitely not equivalent to EMT with an EGC.
On the code side of the issue, 330.3(B) general applies. Subsections (1) through (4) do not alleviate the general requirement in your case.
I believe the requirement assumes the conductors to be properly terminated at each endOriginally Posted by 330.3
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I will have achieved my life's goal if I die with a smile on my face.
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