Fire Alarm Cause And Effect Matrix

Fire Alarm Cause-and-Effect Matrix

Scenario C: The "Complex" Story (Zones and Timers)

Part 7: The "Matrix Failure" - Common Mistakes

• Rows (Causes): These are the input devices (Detectors, Manual Stations, Sprinkler Switches).
• Columns (Effects): These are the outputs (Notification Appliances, Control Functions, Relays).
• Intersections (Logic): An "X" or specific symbol in a grid cell indicates that the Cause triggers that specific Effect.

Effect: Stairwell Fan Pressurization Logic: If (Alarm on Floor 5) AND (Floor 5 Smoke Detector) = ON, THEN (Stairwell Fan Relay Output) = ON.