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9.10.9.15.(2)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Fire-resistance rating of fire separations that separate public corridors from the remainder of buildings, where:
  • the floor area is sprinklered,
  • the sprinkler system is electrically supervised in conformance with Sentence 3.2.4.9.(2), and
  • the operation of the sprinkler system will cause a signal to be transmitted to the fire department in conformance with Sentence 3.2.4.7.(4).
This applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Exceptions: 
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Intent
Intent 1: 
To exempt public corridor separations from the application of Sentence 9.10.9.15.(1) by waiving the requirement for a minimum 45 min fire-resistance rating if certain conditions are met [i.e. the floor area is sprinklered throughout and the sprinkler system meets certain operational requirements].
This is to limit the probability that a fire will not be controlled or suppressed, which could lead to:
  • the spread of fire into the public corridor, or from the public corridor into a suite, which could lead to delays in the evacuation or movement of persons to a safe place, or
  • delays or ineffectiveness in fire emergency response operations, which could lead to
    • delays in the evacuation or movement of persons to a safe place, or
    • the spread of fire to other parts of the building.
This is to limit the probability of harm to persons.
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