the driven ground rod has to do with the service entrance ONLY not the sub panel! the sub panel is fed with the two hots from the main, the white from the main and the bare equipment ground from the main. the white and equipment groundcomes off the neutral bar. they are split up at the sub panel. the neutral bar is not bonded to the cabinet. the aux ground bar and the bare earth ground is bonded to the cabinet. no ground rods are used here.
don't even think you need a ground rod here - you don't!
don't even think you need a ground rod here - you don't!
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