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3.4.6.5.(4)
OS3
ObjectiveOS3 Safety in Use
Attribution
Application
Application 1: 
Minimum height of guards for exterior stairs and landings, where the stairs and landings are more than 10 m above adjacent ground level.
This applies--in buildings described in Sentence 1.3.3.2.(1) of Division A--to:
Application 2: 
This also applies to:
  • ramps, stairways and passageways used by the public as access to exits, as stated in Appendix Note A-3.4.6.,
  • tents and air-supported structures, as stated in Sentences 3.1.6.1.(1) and 9.10.1.2.(1),
  • stairs in a means of egress from a roof, where a roof is used or intended for an occupant load more than 60, as stated in Sentence 3.3.1.3.(4),
  • ramps and stairways, as stated in Sentence 3.3.1.14.(1), and
  • ramps in a barrier-free path of travel, as stated in Clause 3.8.3.4.(1)(e).
Exceptions: 
except as stated in:
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Intent
Intent 1: 
To supersede the requirements of Sentence 3.4.6.5.(2) and require a greater minimum height for guards for exterior exit stairs and landings that are more than 10 m above ground level, on the basis that additional protection from falling over the guards is warranted.
This is to limit the probability that:
  • persons using exit ramps and landings will fall over a guard from a higher level to a lower level, which could lead to harm to persons, and
  • the absence of a high guard for exit ramps and landings will impede its use during an emergency situation, which could lead to lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons.
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