What size Equipment Grounding Conductor would be installed with the tap conductors to a 200a switch. The feeder overcurrent protection is 600 a and the tap conductors run 25 feet and are 3/0 copper and terminate in a 200 ampere switch with 200 a fuses installed.
I agree with you iwire, but it's not thst clear in the NEC. It's one of those things left silent and you need to use logic to figure it out, like you put it, what overcurrent device will it be opening.
As usual the handbook does a better job of explaining things. This is commentary from 250.122 "Equipment grounding conductors on the load side of the service disconnecting means and overcurrent devices are sized based on the size of the feeder or branch circuit overcurrent devices ahead of them."