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3.2.4.2.(2)
OS1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Design and installation of fire alarm systems, where a building contains more than one major occupancy and a fire alarm system is required.
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).
Exceptions: 
except as exempted in Sentence 3.2.4.2.(4), which applies to a building not more than 3 storeys in building height, in which a vertical fire separation having a fire-resistance rating of not less than 1 h separates portions of the building from the remainder of the building as if it were a separate building.
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Intent
Intent 1: 
To limit the probability that different fire alarm systems will be used within a building, which could lead to confusion about the appropriate course of action to be taken in a fire emergency, which could lead to delays in evacuation or moving to a safe place, which could lead to harm to persons.
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