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3.2.4.5.(1)
OS1OS3
ObjectiveOS3 Safety in Use
Attribution
[F12,F11-OS3.7] Applies to voice communication systems.
Application
Application 1: 
Installation of voice communication systems.
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A in which voice communication systems are installed.
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] in which fire alarm systems are installed, as stated in Sentence 9.10.18.6.(1).
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Intent
Intent 1: 
To limit the probability that emergency responders will not be able to communicate in an emergency situation, which could lead to delays or inefficiencies in carrying out emergency response operations, which could lead to delays in evacuation or moving to a safe place, which could lead to harm to persons.
Intent 2: 
To limit the probability that persons will not be properly instructed in an emergency situation, which could lead to inappropriate action by such persons, which could lead to delays in evacuation or moving to a safe place, which could lead to harm to persons.
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