It references the earth only at the building entrance neutral-ground bond or the secondary neutral-ground ... which is often the main distribution power panel. One of the misunderstandings associated ...

Interestingly, the NEC requires raceways and enclosures that contain feeder or branch conductors to connect to the circuit “equipment grounding conductor” [250.86], which is actually a bonding ...

So, grounding is the intentional connection between the neutral wire and the grounding means of the generator, which includes its frame. The term "bonding ... ohms or less. A panel-mounted ...