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9.8.8.3.(3)
OS3
ObjectiveOS3 Safety in Use
Attribution
Application
Application 1: 
Minimum height of all exterior guards serving not more than one dwelling unit and serving a walking surface not more than 1800 mm above the finished ground level, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To limit the probability that guards will not be high enough to provide reasonable fall protection, which could lead to:
  • persons falling, or
  • persons falling in an emergency, 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.
Intent 2: 
To supersede the guard height requirement stated in Sentence (1), in cases where the risk of falling is limited and where occupants are likely to be familiar with their surroundings [see Sentence (2)].
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