- Phased
In the context of an Emergency Warning System as described in Australian Standard AS 1670.4 and AS 2220, the term "phased" or "cascade" refers to the structured and sequential activation of alarm signals or warning signals in different areas of a building.
This process is designed to manage the orderly, efficient and effective evacuation of a building. Phased evacuation is often used in large or complex buildings, such as high-rise structures or hospitals.
Benefits of Phased Warning Signals
Sequential Notification
- Alarms are activated progressively, starting with the area closest to the emergency.
- Adjacent areas or those requiring preparedness for potential evacuation receive warnings next.
Controlled Evacuation
- Limits evacuation to occupants in immediate danger are evacuated first;
- Adjacent areas are alerted to prepare for potential evacuation or to remain in place.
Purpose
- Reduces the risk of congestion in the paths of travel such as stairwells and exits;
- Minimises disruption in unaffected areas of the building.