Generator Feeds transfer Switch off a Breaker. (there are several breakers feeding
other transfer switchs besides Fire Pump). Thus Ist Disconnect Neurtal Must be grounded there (Generator), So from there To Fire Pump transfer Switch only a Ground is required as the Pumps 480 volt 3 phase.
Now the power co. side :
As theres NO disconect switch ahead of the Transfer swith Except the one on the Service rated Transfer switch The Neutral Must be brought in and grounded here. (The fire Pump transfer switch is a 3 pole only .
