(1)
Where a generator intended to supply emergency power for lighting, fire safety and life safety systems is located in a building, except where such building is used solely for the purpose of housing the generator and its ancillary equipment, it shall be located in a room that
(a)
is separated from the remainder of the building by a fire separation with a fire-resistance rating not less than 2 h, and
(b)
contains only the generating set and equipment that is related to the emergency power supply system.