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.
(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.