What is the requirement for pre-alarm signals?

What is the requirement for pre-alarm signals?

• A. Must be distinctive from other signals
• B. Must be identical to alarm signals
• C. Must be slower than alarm signals
• D. Must be audible only without vibration

Answer: (A)

The main idea is that pre-alarm signals must be clearly different from the actual alarm signals. This distinction lets occupants and responders recognize that something is detected, but not yet a full fire condition, so they can investigate or take precaution without evacuating. If the pre-alarm sounded the same as the full alarm, people could mistake it for a real evacuation cue and react inappropriately, causing confusion or delays. Therefore the pre-alarm signal should use a different tone, cadence, or modality from the alarm signal so it stands out as an early warning.

The main idea is that pre-alarm signals must be clearly different from the actual alarm signals. This distinction lets occupants and responders recognize that something is detected, but not yet a full fire condition, so they can investigate or take precaution without evacuating. If the pre-alarm sounded the same as the full alarm, people could mistake it for a real evacuation cue and react inappropriately, causing confusion or delays. Therefore the pre-alarm signal should use a different tone, cadence, or modality from the alarm signal so it stands out as an early warning.