(1)
Except as provided in Sentence (3), the fire alarm system required by Sentence 2.2.3.1.(1) shall include
(a)
audible signal devices conforming to Sentences 3.2.4.18.(1) to (4), (7) and (11),
(b)
an audible alarm signal device with a sound pressure level not less than 110 dBA installed on the exterior of the farm building, and
(c)
visible signal devices installed in any floor area in which
(i)
the ambient noise level is more than 87 dBA,
(ii)
the occupants use ear protection devices, or
(iii)
the occupants are located in sound-insulating enclosures.
(2)
The visible signal devices required by Clause (1)(c) 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))
(3)
The audible alarm signal devices referred to in Clauses (1)(a) and (b) need not be provided in areas where animals are present, provided that visible signal devices are installed in accordance with Sentence (2).