What would you do...

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iMuse97 said:
Short answer: generally anywhere the circuits branch off or are terminated at a load. For instance, if I ran two 480 circuits (3 ungrounded conductors each) for motor feeds, I would only splice the green #12AWG where the two circuits separated to each motor, and terminate each of those on a ring lug at each motor.

BTW, the note (as you quoted it in your OP) doesn't require a separate green ground conductor with each circuit, but only that the equipment grounding conductor be run with the branch circuits and feeders.
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Thanks. So your saying that the ground would go to the loads? So if you had (5) single phase 120v circuits run out to a home run box and then pipes branch out from their to the circuits would there be a separate ground in each one of those " branch" conduits to the devices/loads or would it only be run to the HR box from the panel
 
horsegoer said:
Thanks Strat. So when running the ground from the ground bar in panel through the conduit with a few ckts where does the ground get connected/spliced to for say (3 ) ckts in that conduit?
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I suggest you don't really think of the ground wire as associated with the circuit(s). Think of it as associated with all metal that may become energized by a fault along th path of the circuits. That is why, if all of the current conductors and the neutral are not spliced in a junction box, the ground can also pass through. (not likely to become energized) When one conductor is spliced, the ground MUST be bonded to the box. If you came to box and the conductors split to 2 separate directions, you have two options, one is to run two grounds in the home run pipe and one of them in each load side conduit, or cut the ground, bond it to the box and splice it with the two outgoing conductors. The green wires basically create a single path back to the point in the service where the neutral and the ground are bonded together. Like a tree from the outer branches (devices and loads) to the big branches (subpanels) to the distribution (trunk) to the service (base or roots). The size of the ground is based on the current carrying capacity of each branch, so it gets bigger the closer it gets to the base.
 
haskindm said:
The fact that you installed an additional grounding conductor does NOT mean that the metal conduit is NOT also a grounding conductor. Electrons do not know that they are supposed to travel on a wire instead of a pipe :) ! Since the conduit is required to be "complete" in most cases, it is connected to the panel and to the equipment or outlet box, so it is indeed a grounding conductor, even if it is supplemented by a wire. If the waterline ground is "supplemented" by a ground rod, are they not both grounding electrodes?
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Semantics. It does mean that the metal conduit does not need to be an intentional code required path, and as such only requires bonding like any other metal in the building. For a good example, if you have to put an expansion joint in or a piece of flex over 6 feet long, you only have to run a bond jumper over it if you are using the conduit as the grounding conductor. So you are actually 100% wrong here.
 
horsegoer said:
Thanks. So your saying that the ground would go to the loads? So if you had (5) single phase 120v circuits run out to a home run box and then pipes branch out from their to the circuits would there be a separate ground in each one of those " branch" conduits to the devices/loads or would it only be run to the HR box from the panel
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Sorry, this thread is becoming a "how to" thread and it's time to close it.

Roger
 
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