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9.9.11.3.(6)
OS3
ObjectiveOS3 Safety in Use
Attribution
Application
Application 1: 
Self-contained emergency lighting units in:
This applies to 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).
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Intent
Intent 1: 
To limit the probability that the performance of self-contained emergency lighting units will fall significantly below expectations, which could lead to such devices not performing in the way intended when there is a loss of normal power, which could lead to certain areas in buildings having inadequate illumination, which could lead to safety hazards [bumping, tripping, falling, etc.], which could lead to harm to persons.
Intent 2: 
To limit the probability that the performance of self-contained emergency lighting units will fall significantly below expectations, which could lead to such devices not performing in the way intended 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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