My local road commision has purchased a 90KW generator with a 400A automatic transfer switch, suitable for use as service equipment, and wants me to connect it. The building is one of their maintenance garages and has a 2000A service with a 800A main. The supervisor wants me to down size the fuses to 400A saying that's all the service they need. I haven't done an actual load survey yet, but am concerned if the local inspector will even allow this. Any ideas?