bonding of the neutral and ground / breaker trip

[Little Bill]

So I am pretty sure that the equipment ground would still be required to bond all metal parts it enters. Does your state have a requirement to remove the ground wire. Here clipping that wire would get me in a bit of trouble and if I came to a new romex to re feed the old home run with a new grounded circuit to find that I need to completely rewire this new wire because the ground is clipped off I'd be mad. I think there's a mike holt pic showing connecting the ground to the gfi to bond metal boxes after the initial device.

If there was no EGC, connecting the bare conductor to the metal box would not be bonding anything since there is no grounding conductor back to the panel. In fact, it would "spread" a fault to another location rather than a fault path back to the source. So you are not supposed to connect the EGC/bare conductor to anything (receptacle or box) unless there is an EGC back to the source.

 

[Krusscher]

Suppose you use a GFCI device to allow use of grounding receptacles on a non-grounded circuit. Now, suppose you want to add a receptacle or two. You would use NM cable, which has a ground. You should not connect the ground wires to any receptacles or other ground wires. Clip them off.

Suppose an internal hot wire energized the external metal parts of a load with a grounding plug. If you connect the ground between two receptacles, the metal parts of a second load with a grounding plug would also become energized, interconnected by the ground wire in the new cable.

But if you were adding on to this circuit wouldn't you be required to bring the rest of it up to code?

 

[letgomywago]

If there was no EGC, connecting the bare conductor to the metal box would not be bonding anything since there is no grounding conductor back to the panel. In fact, it would "spread" a fault to another location rather than a fault path back to the source. So you are not supposed to connect the EGC/bare conductor to anything (receptacle or box) unless there is an EGC back to the source.

If the whole circuit is on the load size of the device from the gfci and there is a ground wire connection to the gfci it will trip the gfci with EITHER nuetral to bare wire fault or a hot to bare wire fault. The CT will still detect an imbalance. The only way there would be danger would be if the bare wire was not connected to the actual gfci device and a fault occurred to that. Do you need a bench experiment to demonstrate this to you?