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3.2.4.18.(11)
OS1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Separate signal circuits for audible signal devices [forming part of a fire alarm system] located within dwelling units or suites of residential occupancy and areas outside dwelling units or suites of residential occupancy.
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A in which fire alarm systems are installed.
Application 2: 
This also applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9] in which fire alarm systems are installed, as stated in Sentence 9.10.18.6.(1).
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Intent
Intent 1: 
To limit the probability that disconnected or damaged audible signal devices on one floor will interfere with the ability of devices on other floors to operate, which could lead to persons not being promptly notified of a fire situation, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons.
Intent 2: 
To limit the probability that disconnected or damaged audible signal devices within specified areas will interfere with the operation of devices outside these areas (or vice-versa), which could lead to persons not being promptly notified of a fire situation, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons.
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