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9.9.11.3.(4)
OS3
ObjectiveOS3 Safety in Use
Attribution
Application
Application 1: 
Minimum average illumination level at floor or tread level of lighting required in Sentence (1) [emergency lighting in exits, principal routes providing access to exits in open floor areas, corridors used by the public, underground walkways, and public corridors ], in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Exceptions: 
except:
  • for exits that serve only one dwelling unit, as stated in Sentence 9.9.11.1.(1), and
  • as stated in Sentence 9.9.11.3.(5), which applies to incandescent lighting.
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Intent
Intent 1: 
To limit the probability that certain areas in buildings will have inadequate illumination when there is a loss of normal power, which could lead to safety hazards [bumping, tripping, falling, etc.], which could lead to harm to persons.
Intent 2: 
To limit the probability that certain areas in buildings will have inadequate illumination when there is a loss of normal power in 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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