What is the minimum water flow for a water flow alarm to activate?

The minimum water flow necessary for a water flow alarm to activate is based on the requirement to ensure that there is adequate water being delivered through the system to indicate a potential fire event. When the flow of water is equal to or greater than what would be expected from four sprinkler heads, it suggests a significant demand on the system that is typically associated with a fire incident. This threshold helps in providing an effective response to potential emergencies.

In fire protection systems, the activation of the water flow alarm at this level serves a crucial purpose. It alerts building occupants and fire safety personnel that a fire has likely occurred, prompting a swift response. By establishing this standard, safety regulations ensure that the monitored water flow indicates a real threat, allowing for timely evacuation and firefighting efforts.