The neutral of each grounded generation and distribution system must:
(a) Be grounded at the generator switchboard, except the neutral of an emergency power generation system must be grounded with:
(1) No direct ground connection at the emergency switchboard;
(2) The neutral bus permanently connected to the neutral bus on the main switchboard; and
(3) No switch, circuit breaker, or fuse in the neutral conductor of the bus-tie feeder connecting the emergency switchboard to the main switchboard; and
(b) Have the ground connection accessible for checking the insulation resistance of the generator to ground before the generator is connected to the bus.