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3.5.3.3.(2)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Fire separation that separates a room containing elevator machinery from the elevator hoistway that it serves, where the room and the hoistway are separated from all other parts of the building by a fire separation having a fire-resistance rating not less than that required for the vertical service space containing the elevator hoistway.
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A.
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], as stated in Sentence 9.10.1.2.(1).
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Intent
Intent 1: 
To supersede the requirements of Sentence 3.5.3.3.(1), which would otherwise require a room containing elevator machinery to be separated from the elevator hoistway by a fire separation, and waive such separation if certain conditions are met [the room and the hoistway are separated from all other parts of the building].
This is to limit the probability that:
  • a fire involving the room and hoistway will spread to other parts of the building, which could lead to harm to persons in other parts of the building, and
  • a fire will spread from other parts of the building into the room and hoistway, which could lead to:
    • harm to persons in elevator cars in the hoistway, and
    • the failure of the elevator machinery, which could lead to harm to persons in elevator cars.
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