In which case would partial evacuation be activated?

Partial evacuation is typically activated when there is a fire on the floor where the alarm has been triggered and on two floors below that level. This scenario is critical because it indicates that the fire poses a direct threat not only to the occupants of the involved floor but also to those on the adjacent lower floors.

In this situation, a partial evacuation allows for the safe movement of occupants from floors that are at risk while still enabling those on floors above the fire to remain where they are, assuming the conditions are safe and they are not directly threatened by smoke or fire. This strategic approach to evacuation can help maintain order, reduce panic, and prevent unnecessary exposure to danger for occupants who are not in the immediate vicinity of the fire. It serves to streamline evacuation processes in high-rise buildings where full evacuations may not always be feasible or necessary for all occupants.

Other scenarios mentioned may lack the urgency or specifics needed to warrant a partial evacuation. For instance, if the building does not have at least two floors below the alarm, deciding to evacuate would be questionable since there are not enough lower floors to consider. Similarly, the instruction for occupants to leave immediately does not specify conditions that influence a partial evacuation. Lastly, the presence of a working fire alarm system alone does