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3.2.7.5.(1)
ApplicationIntent
OS1OP1OP3OS3
ObjectiveOS3 Safety in Use
Attribution
[F81,F30-OS3.1] [F81,F11,F10,F12-OS3.7]
Application
Application 1: 
Installation of emergency electrical power systems, in buildings described in Sentence 1.3.3.2.(1) of Division A, used to supply emergency power to:
  • emergency lighting systems, as required in Articles 3.2.7.3. and 3.2.7.4.,
  • fire alarm systems, as required in Article 3.2.7.8.,
  • voice communication systems in high buildings, as required in Sentence 3.2.7.8.(1),
  • elevators in buildings more than 36 m high, as required in Clause 3.2.7.9.(1)(a),
  • water supply for firefighting, as required in Clause 3.2.7.9.(1)(b), and
  • fans and other electrical equipment that are installed to maintain air quality and venting in high buildings defined in Subsection 3.2.6., as required in Clauses 3.2.7.9.(1)(c) and (d).
Exceptions: 
except as stated in:
  • Article 3.2.7.6., which applies to hospitals and nursing homes, and
  • Article 3.2.7.7., which applies to gas fuel-fired engines or turbines for an emergency electric power supply dependent on a fuel supply from outside the building.
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Intent
Intent 1: 
To limit the probability that emergency power systems will not operate as originally intended when there is a loss of normal power, which could lead to the inability of the emergency power systems to supply emergency lighting systems to illuminate floor areas and egress routes, which could lead to safety hazards [bumping, tripping, falling, etc.], which could lead to harm to persons.
Intent 2: 
To limit the probability that emergency electrical power systems will not meet proper standards, which could lead to emergency electrical power systems not performing as intended when there is a loss of normal power in an emergency situation, which could lead to the inability of the emergency electrical power systems to supply emergency systems, which could lead to the inability of:
  • fire alarm or voice communication systems to promptly notify persons in the building, which could lead to delays in the evacuation or movement of persons to a safe place,
  • emergency lighting systems to illuminate egress routes, which could lead to delays in the evacuation or movement of persons to a safe place, and
  • 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.
This is to limit the probability of harm to persons.
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