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3.2.7.7.(1)
ApplicationIntent
OS1OP1OH5OS1OS3
ObjectiveOS3 Safety in Use
Attribution
[F81-OS3.1,OS3.7] Applies to the requirement for a suitably identified separate shut-off valve.
Application
Application 1: 
Identification and provision of a separate fuel supply shut-off valve for liquid or gas fuel-fired engines and turbines for emergency electrical power supplies, where the engines or turbines are dependent on a fuel supply from outside the building.
This applies to emergency electrical power systems, for 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).
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Intent
Intent 1: 
To limit the probability that fuel supplies to emergency power systems will not be maintained in the event that fuel supplies to other systems are required to be shut off, 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 fuel supplies to emergency power systems will not be maintained in the event that fuel supplies to other systems are required to be shut off, which could lead to the inability of the emergency 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,
  • 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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