Fire Alarm Cause And Effect Matrix ((install))
Why a Cause & Effect Matrix is Essential for Fire Alarm Systems
What are you writing this for (e.g., data center, high-rise, industrial plant)?
Duct smoke detectors must shut down air handling units to prevent smoke from circulating through the building. In complex facilities, the matrix dictates smoke control systems to pressurize non-fire zones and exhaust the fire zone. Access Control Release fire alarm cause and effect matrix
If (Detector A activates) THEN (Alert Security Staff only). If (Detector A AND Detector B activate) THEN (Full Evacuation of Floor).
| Pitfall | Consequence | |---------|--------------| | | Smoke clears but doors stay locked, fans remain off. | | No distinction between alarm & pre-alarm | Stage 1 (staff alert) triggers full evacuation. | | Ignoring multiple simultaneous causes | Two separate fires in different zones – system may lock out second response. | | Effect overwritten by later cause | Fire in lobby recalls lift. Second fire in upper floor – lift already recalled, matrix doesn't say what happens next. | | Manual call point treated same as detector | MCP should usually give no verification delay – many matrices miss this. | Why a Cause & Effect Matrix is Essential
Fixed-temperature or rate-of-rise heat detectors.
If you are in the process of designing a fire safety system, ensuring you have a clear cause and effect matrix is paramount. Access Control Release If (Detector A activates) THEN
Listed on the horizontal axis (columns). These include notification appliances (horns/strobes), voice evacuation announcements, elevator recalls, fire door releases, and HVAC shutdowns.
What is the of your building? (e.g., high-rise office, hospital, industrial warehouse)
The matrix below summarizes key causes and their direct effects. Each cause is rated for (1–5, where 5 is catastrophic) and likelihood (1–5, where 5 is highly probable). The Risk Priority Number (RPN) = Severity × Likelihood.
The "Cause" column lists every device or condition that can send a signal to the fire alarm panel. Common triggers include: