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3.2.4.21.(3) | Application | Intent |
| OS1 |
| Objective | OS1 Fire Safety |
| Attribution | |
| Application | Application 1: Provisions in voice communication systems for silencing alert signals and alarm signals in
2 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 alert signal has sounded
initially for not less than a certain period of time. 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 alert signal sounding for not less than a certain period
of time] is to limit the probability that designated persons [staff] will
be unaware or misinformed of a fire situation, which could lead to:
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