The matrix must live for the life of the building.

Triggered by components like sprinkler tamper switches. These record events and alert the control panel but typically do not evacuate the building [1, 20].

In the United States, NFPA 72 (National Fire Alarm and Signaling Code) explicitly requires that the fire alarm system’s anticipated responses to signals be documented. International Building Code (IBC) sections related to smoke control and elevator recall mandate specific "effects" that must be documented in a matrix. During a fire marshal inspection, failing to produce an approved C&E matrix is a common reason for failing a Certificate of Occupancy test.

Over time, building layouts change, tenants move, and systems are upgraded. The cause and effect matrix must be treated as a living document. It should be re-verified during annual fire system testing to ensure that software updates or renovations haven't broken the critical logic loops. Conclusion

This is the simplest approach, where any activation triggers an immediate general alarm across the entire building. It is common in smaller, less complex buildings.

Automatic sensors placed throughout rooms and corridors.

The "effect" side of the matrix lists all the actions the system can initiate.

For example, a smoke detector in a 5th-floor elevator lobby (Cause) will have an "X" in the column for "Elevator Recall" (Effect), but a smoke detector in the basement parking lot might not. Complex Logic: Delays and Coincidence

Write down every controlled device: Sounders, Beacons, Magnetic door holders, Fire shutters, AHUs, Gas valves, Elevator recall relays, Fire phone taps.