The matrix is constructed with listed vertically on the left and Outputs (Effects) listed horizontally across the top. Intersections indicate an action.
| Cause (Input) | Effect (Output Action) | Delay (sec) | Notes | | :--- | :--- | :--- | :--- | | | O3 (AHU shutdown) | 0 | Immediate stop of HVAC to prevent smoke spread | | | O4 (Stair fan) | 0 | Start pressurization only if multiple detectors confirm | | I2 (Area Smoke - Zone 5) | O1 (Alarm - Zone 5 only) | 0 | Local alarm | | | O2 (Door release - Zone 5) | 0 | Contain smoke | | | O6 (Damper - Zone 5) | 0 | Close associated dampers | | I3 (Pull Station) | O1 (Global Alarm) | 0 | All notification appliances building-wide | | | O5 (Elevator recall) | 10 | Allow elevator to finish descent, then shunt trip | | I4 (Heat Detector - Kitchen) | O1 (Alarm - Local floor only) | 0 | No sprinkler activation (heat detector is supervisory) | | I5 (Sprinkler Flow) | O1 (Global Alarm) | 0 | Confirms fire, overrides smoke detector logic | | | O2 (All doors release) | 0 | Entire floor | | | O3 (AHU shutdown) | 0 | Confirmed fire | | | O5 (Elevator recall) | 0 | Immediate | | I6 (Tamper Switch) | Supervisory signal only | N/A | No evacuation; alert facility manager | cause and effect matrix for fire alarm system
Project Stakeholders / Facility Management / Fire Safety Officers From: [Your Name/Department] Date: October 26, 2023 Subject: Development and Analysis of the Fire Alarm System Cause and Effect Matrix The matrix is constructed with listed vertically on
To prevent the spread of smoke through ductwork, associated Air Handling Units (AHU) are hard-wired or programmed to shut down upon detection in the served area. However, toilet extract fans may remain active to maintain negative pressure. However, toilet extract fans may remain active to