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6.3.1.5.(2)
OS3
ObjectiveOS3 Safety in Use
Attribution
Application
Application 1: 
Minimum distance from the ground for the lowest rungs of external ladders for chimneys or buildings, in buildings described in Sentence 1.3.3.2.(1) of Division A.
Application 2: 
This also applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], with respect to heating systems, including requirements for combustion air, and air-conditioning systems other than those serving individual dwelling units, as stated in Sentence 9.33.1.1.(2).
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Intent
Intent 1: 
To limit the probability that ladders will be used by unauthorized persons, which could lead to falls, which could lead to harm to persons.
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