[Electrical Expert] How should the capacity of a diesel generator set be selected?

[Electrical Expert] How should the capacity of a diesel generator set be selected?

It should cover fire protection loads (stairwell sprinklers, smoke exhaust fans, fire hydrant pumps, etc.) and critical loads (fire control room, security systems, communication hub, guest room power). Typically, the capacity is selected at 10-15% of the total transformer capacity.