How long does the pre-alarm go off after no motion is detected?

In the context of firefighting and emergency response, the pre-alarm serves as an important alert system, typically designed to notify personnel of a potential or imminent hazard. When no motion is detected, the duration of the pre-alarm is critical for allowing responders to assess the situation and take necessary actions.

A pre-alarm that goes off for 20 seconds after no motion is detected allows adequate time for personnel to be alerted to a potentially serious situation, without causing undue alarm. This specific timeframe balances the need for vigilance with the practicality of not overwhelming responders with frequent alerts that may ultimately turn out to be false alarms. Additionally, the 20-second duration aligns with standard safety protocols designed to provide a timely response while also preventing unnecessary interruptions.

Understanding this duration is essential for firefighters as it directly influences their readiness to respond to incidents and ensures a well-coordinated alert system within a fire department.