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3.6.2.8.(1)
ApplicationIntent
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
[F03-OS1.2,OS1.4] [F06-OS1.2,OS1.5]
Application
Application 1: 
Minimum fire-resistance rating of fire separations separating service rooms containing a generator to supply emergency power for lighting, fire safety and life safety systems from the remainder of the building.
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A.
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Intent
Intent 1: 
To supersede the requirements of Sentences 3.6.2.1.(1) and (3) to (6), which would otherwise require a minimum 1 h fire separation, and require a higher minimum rated separation, on the basis that there is a higher risk of fire or explosion where there is a generator.
Intent 2: 
To limit the probability that fire will spread from a service room containing a generator to other parts of the building, which could lead to harm to persons in the other parts of the building.
Intent 3: 
To limit the probability that a fire originating in a location outside a service room containing a generator will spread into the service room, which could lead to the disruption and discontinuation of service from equipment located in the service room, which could lead to an undue fire hazard in the building, which could lead to harm to persons.
Intent 4: 
To limit the probability that the generator will prematurely fail when exposed to fire, which could lead to fire alarm systems, sprinkler systems and other emergency equipment not operating properly in the fire situation, which could lead to:
  • fire emergency response operations being delayed or ineffective, which could lead to:
    • delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons, and
    • the spread of fire to other parts of the building, which could lead to harm to persons,
  • persons not being promptly notified of the 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, and
  • the buildup of smoke in exit stairs or floor areas, which could lead to:
    • delays or inefficiencies in fire suppression operations, which could lead to the spread of fire, which could lead to harm to persons, including emergency responders, and
    • delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons.
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