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3.2.7.9.(2)
ApplicationIntent
OS1OP1OS3
ObjectiveOS1 Fire Safety
Attribution
[F12-OS1.5,OS1.2]
Application
Application 1: 
Design, with respect to the minimum duration of the simultaneous operation under a full load of all elevators for firefighters plus one additional elevator, of emergency generator power supplies for elevators required by Clause 3.2.7.9.(1)(a):
Exceptions: 
except as exempted in Sentence 3.2.7.9.(3), which applies when the time to recall all elevators under emergency power supply is not more than 5 min.
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Intent
Intent 1: 
To limit the probability that, during a failure of the normal power supply in a fire emergency situation, emergency generator power supplies to elevators will not be capable of performing their intended functions for a length of time sufficient for emergency responders to carry out their duties, which could lead to the inability of elevator systems to be used in emergency response operations, which could lead to delays in emergency response operations, which could lead to:
  • delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons, including emergency responders, and
  • the spread of fire, which could lead to harm to persons.
Intent 2: 
To clarify that the emergency generator power supply required by Clause 3.2.7.9.(1)(a) is required to simultaneously operate all elevators for firefighters plus one additional elevator for recall.
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