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3.2.4.2.(4)
OS1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Design and installation of fire alarm systems in portions of a building, where:
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.(5), which applies to service rooms and storage rooms.
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Intent
Intent 1: 
To supersede the requirements of Sentences 3.2.4.1.(2), and 3.2.4.2.(2) and (3), and permit a fire alarm system in [only] a portion of a building, if certain conditions are met.
These conditions are to limit the probability that:
  • excessive travel distances will occur, which could lead to delays in evacuation or moving to a safe place, which could lead to harm to persons,
  • the separations between the portions of the building will have insufficient fire resistance, which could lead to the spread of fire from one portion of the building to another portion of the building, which could lead to harm to persons in the other portion of the building, and
  • fire and products of combustion will spread from one portion of the building to another portion of the building through openings in the separation between building portions, which could lead to harm to persons in the other portion of the building.
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