The neutral of an emergency power generation system must be grounded in a specific manner that differs from the main generation system. Which of the following correctly describes the required grounding arrangement for the emergency system neutral?

1. A. The neutral must be directly grounded at the emergency switchboard, with a fuse in the neutral bus-tie conductor sized at 200 percent of rated current.
2. ✓ The neutral must have no direct ground at the emergency switchboard; the neutral bus must be permanently connected to the main switchboard neutral bus with no switch, circuit breaker, or fuse in the bus-tie neutral conductor.Correct
3. C. The neutral must be grounded at both the emergency switchboard and the main switchboard, with a transfer switch to select which ground is active.
4. D. The neutral must be left floating at the emergency switchboard and grounded only through the load circuits.