What is the maximum time allowed between the start of water flow in a fire sprinkler and the activation of the alarm signal?

In fire protection systems, the timing between the start of water flow in a sprinkler system and the activation of the alarm signal is crucial for ensuring rapid response to a fire. The maximum allowed time is typically set at 90 seconds. This guideline is in place to ensure that an alarm sounds quickly enough to alert occupants and facilitate the appropriate emergency response before a potentially dangerous situation escalates.

The 90-second window aligns with standards established by fire protection codes, recognizing that a timely alarm can significantly enhance safety by providing warning while also ensuring that personnel can react promptly to evacuate the building or begin firefighting efforts if it is safe to do so. Delaying the alarm beyond this threshold could lead to unnecessary property damage or danger to life, as it would reduce the time for effective evacuation and response.

Understanding this standard is essential for anyone involved in the design, installation, or maintenance of fire sprinkler systems, as it highlights the importance of timely notifications in fire safety measures.