How quickly must alarm or notification appliances activate after the initiation of a device?

The requirement for alarm or notification appliances to activate within a specific timeframe after the initiation of a device is critical for ensuring a timely response to a fire situation. The correct answer, which states that the appliances must activate within 10 seconds, aligns with the standards set forth by the National Fire Alarm and Signaling Code.

The 10-second timeframe is designed to facilitate quick notification of occupants in a building in the event of an emergency, allowing them to take appropriate action, such as evacuating or seeking assistance. This quick activation is particularly important in fire scenarios, where every second counts and delays can lead to increased risks to life and property.

While other options suggest longer activation periods, they do not conform to the established best practices and standards aimed at maximizing safety during emergencies. Meeting the 10-second requirement ensures that fire alarm systems can effectively alert individuals in a timely manner, which is essential for minimizing potential harm and ensuring a swift evacuation process.