(1) Subject to sub-regulation (2), this Subdivision applies to—
(a) a Class 1b, 2, 3, 5, 6, 7, 8 or 9 building; and
(b) a Class 4 part of a building; and
(c) a place of public entertainment.
(2) This Subdivision does not apply to a smoke alarm installed in a sole-occupancy unit in a Class 1b or 2 building or a Class 4 part of a building.