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3.4.6.5.(2)
OS3
ObjectiveOS3 Safety in Use
Attribution
Application
Application 1: 
Minimum height of guards for exit stairs and landings.
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 of 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 limit the probability that persons using exit stairs and landings will fall over a guard from a higher level to a lower level, which could lead to harm to persons.
Intent 2: 
To limit the probability that the absence of a high guard for exit stairs and landings will inhibit their use during an emergency situation, which could 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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