(1)
Except as permitted by Sentence (4), where a fire alarm system is installed, visible signal devices shall be installed in addition to alarm signal devices
(a)
in a building or portions thereof intended for use primarily by persons with a hearing impairment,
(b)
in assembly occupancies in which music and other sounds associated with performances could exceed 100 dBA,
(c)
in any floor area in which the ambient noise level is more than 87 dBA,
(d)
in any floor area in which the occupants
(i)
use ear protection devices,
(ii)
are located in an audiometric booth, or
(iii)
are located in sound-insulating enclosures,
(e)
in public corridors serving a Group A, B, C, D or E major occupancy,
(f)
in a corridor used by the public and in a floor area or part of a floor area where the public may congregate in a Group A occupancy,
(g)
in not less than 10% of the suites of a hotel or motel, (See Note A-3.2.4.19.(1)(g))
(h)
in washrooms for public use described in Sentence 3.8.2.3.(2), (3), (4) or (6), and
(i)
in living spaces in a suite of residential occupancy in a Group C major occupancy apartment building.
(2)
Visible signal devices are permitted to be installed in lieu of audible signal devices in the compartments referred to in Article 3.3.3.6. (See Note A-3.2.4.19.(2))
(3)
Visible signal devices required by Sentence (1) shall be installed so that the signal from at least one device is visible throughout the floor area or portion thereof in which they are installed. (See Note A-3.2.4.19.(3))
(4)
Visible signal devices required by Clauses (1)(e) and (f) are not required in
(a)
a classroom, and
(b)
a Group B, Division 3 occupancy that contains sleeping accommodation for not more than 10 persons and not more than six occupants require assistance in evacuation in case of an emergency.