Trying to fully grasp 690.47 (C) (3) in 2011. If I'm landing an inverter output circuit with a backfed breaker in a sub panel am I required to bring the combined unspliced/irreversibly spliced GEC/EGC all the way to the ac grounding busbar in the main service panel where the AC GEC is located or can this terminate at the sub panels grounding busbar? If its is allowed to terminate the GEC/EGC at the busbar in the sub I would assume that the EGC protecting the sub panel must be now be properly bonded on both sides of the raceway between the main and the sub if it is ferrous to prevent inductive choking? I suppose if this is done the EGC between the sub and the main now becomes a continuation of the DC GEC/AC EGC and therefore must be irreversibly crimped together in the sub? Did I just answer my own question?