Which scenario is most likely to require a full evacuation of a building?

In fire safety management, the presence of a public address system is critical for effective communication during an emergency. When a building does not have a public address system, it significantly hampers the ability of the management to relay important information to occupants in a timely and organized manner.

In the event of a fire or other emergencies requiring evacuation, the ability to communicate swiftly can determine whether individuals evacuate safely and efficiently. If there is no effective means of communication, it may be necessary to initiate a full evacuation to ensure that all occupants are alerted and understand the need to leave the building, as confusion can arise and lead to unsafe situations.

In contrast, having a fully sprinklered building, a functional floor warden organization, or a building under ten stories provides layers of safety and security that might allow for the management of emergencies without requiring an immediate full evacuation. These features help mitigate risks and can facilitate more controlled evacuation procedures when necessary. Thus, the absence of a public address system is a significant factor that can lead to a decision to evacuate the building entirely for the safety of all occupants.