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24.4.9.1*
Undivided fire or smoke areas shall not be divided into multiple notification zones.
24.4.9.2
If multiple notification appliance circuits are provided within a single zone, all of the notification appliances within the zone shall be arranged to activate or deactivate simultaneously, either automatically or by actuation of a common manual control.
24.4.9.3
Where there are different notification appliance circuits within a signaling zone that perform separate functions, such as presignal and general alarm signals and predischarge and discharge signals, they shall not be required to activate or deactivate simultaneously.