My answer is based on the following conditions (Iraq): The generator supplies power to the building without any utility service, meaning no transfer switch is needed/provided.
Answer:
The neutral conductor must be connected to the metal frame of the generator (system bonding jumper-250.2) and not the metal frame at the panel [250.24(A)(5)], since the generator has a main breaker. Doing so would create a parallel path for neutral current violation of 250.6.
You must have an equipment grounding conductor between the generator metal frame and the metal frame of the panelboard in accordance with 250.4(A)(4) and 250.118. This conductor serves as the low impedance path necessary to clear a ground fault on the premises.
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