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3.2.7.9.(2) | Application | Intent |
OS1 | OP1 | OS3 |
Objective | OS3 Safety in Use |
Attribution | |
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, persons will be trapped in an elevator, which could lead to
harm to persons. Intent 2: To limit the probability that, during a failure of the normal
power supply in an 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.
Intent 3: 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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