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3.2.4.21.(2) | Application | Intent |
OS1 |
Objective | OS1 Fire Safety |
Attribution | |
Application | Application 1: Provisions in voice communication systems for silencing alarm signals in single stage fire alarm systems when
voice messages are being transmitted. This applies to
voice communication systems required by Sentence 3.2.6.8.(1) in buildings:
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Intent | Intent 1: To supersede the requirements of Sentence 3.2.4.6.(2) and
permit manual [alarm and alert] silencing switches outside the fire alarm
control unit, if silencing can only be done after the alarm signal has sounded
initially for not less than 60 s. This [the
silencing provision] is to limit the probability that voice messages will
not be heard or understood, which could lead to persons not being instructed
in a fire situation, which could lead to inappropriate action by such persons,
which could lead to delays in evacuation or moving to a safe place, which
could lead to harm to persons.
This [the alarm signal sounding for not less than 60 s]
is to limit the probability that persons will not be aware of a fire situation,
which could lead to delays in evacuation or moving to a safe place, which
could lead to harm to persons.
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