The Ontario Building Code | Emergency Power Installations
220.127.116.11. Emergency Power installations
(1) Where a generator intended to supply emergency power for lighting="http://thehandyforce.com/electrical/" title ="East York Electrician">lighting, fire safety and life safety systems is located in a building, 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,
(i) 2 h for buildings within the scope of Subsection 3.2.6., and
(ii) 1 h for other buildings, and
(b) contains only the generating set and equipment that is related to the emergency power supply system.