Fire Alarm Cause And Effect Matrix Jun 2026
Fire Alarm Cause-and-Effect Matrix Purpose Define expected automatic and manual responses of the fire alarm system for each initiating event to ensure correct, predictable actions for life safety, alarm notification, and system control. Matrix Columns (use for each row)
Initiating Event — specific detector/device or manual action (e.g., smoke detector, heat detector, pull station, sprinkler waterflow, supervisory trouble). Detection Criteria / Threshold — alarm thresholds or conditions (e.g., smoke density, rate-of-rise temp, residual time). Alarm Classification — Fire Alarm, Supervisory, Trouble, or System Test. Audible/Visual Notification — horns, strobes, voice evacuation zones, candela, temporal pattern. Central Station / Panel Outputs — local alarm, general alarm, zone relays, NAC (notification appliance circuits). Annunciation / Graphics — LED/zone display, text message at FACU, remote annunciator behavior. Automatic Control Actions — elevator recall, HVAC shutdown, fire dampers close, door releases, fan shutdown, magnetic locks, smoke control sequences. Suppression Interface — sprinkler waterflow, pre-action valve, CO2/clean agent release interlocks, abort/reset logic. Emergency Voice Alarm Communication (EVAC) — live/recorded messages, priority levels per zone. Monitoring & Reporting — reporting to central station, local bell, supervisory signaling, fault escalation. Reset / Latching Behavior — latched/unlatched alarms, manual reset requirements, auto-reset conditions. Time Delays / Sequencing — verification delays, false alarm management (e.g., 30s verification), staged evacuation. Failsafe / Fault Tolerance — backup power behavior, degraded-mode operation, alternate routing. Logging / Forensics — event logging detail, time stamps, device IDs for post-event review. Acceptance Criteria — success conditions, test procedures for each action. References / Standards — applicable codes (e.g., NFPA 72, local building/fire codes).
Example Rows (concise)
Initiating Event: Smoke detector (Zone A) fire alarm cause and effect matrix
Detection Criteria: Photoelectric smoke threshold = X% obscuration Alarm Class: Fire Alarm Notification: Horn/strobe in Zone A (Temporal-3) Panel Outputs: Zone A NAC energized; relay FA1 closes Annunciation: Zone A lit on FACU; remote annunciator displays "Zone A SMOKE" Controls: HVAC shutdown (AHU-1), elevator recall to Level 1, fire doors auto-close Suppression: No direct suppression command; waterflow supervised EVAC: Live/recorded area message for Zone A Monitoring: Transmit alarm to central station (CID) Reset: Manual reset at FACU after condition cleared Delay: 0s verification Fail-safe: Battery backup supplies NAC for 24 hours standby Logging: Event logged with timestamp & device ID Acceptance: Functional test: trigger detector → verify all listed actions Standards: NFPA 72, local code ref
Initiating Event: Sprinkler waterflow switch (Main riser)
Detection Criteria: Flow > X GPM sustained Alarm Class: Fire Alarm / Supervisory (depending on system) Notification: Building-wide horns/strobes (Temporal-3) Panel Outputs: General alarm relay, notify suppression controller Annunciation: "Waterflow — Sprinkler Riser 1" on FACU Controls: HVAC shutdown, pressurize stair shafts, unlock egress doors Suppression: Confirms suppression in progress; interlocks prevent false agent release Monitoring: Central station immediate transmit Reset: Requires manual investigation and reset etc. Annunciation / Graphics — LED/zone display, text message
Initiating Event: Manual pull station (Exit 3)
Detection Criteria: Manual activation Alarm Class: Fire Alarm Notification: Immediate local zone and building evacuation signals Controls: Same as smoke detector alarm controls for that zone or building-wide per design Verification: Optional 30s verification for single station (if allowed by code) Reset: Manual reset at FACU
Initiating Event: Supervisory (Sprinkler valve tamper) Acceptance Criteria — success conditions
Alarm Class: Supervisory Notification: Supervisory tone at FACU; non-evac annunciation Action: Send central station supervisory signal; notify building maintenance Reset: Manual reset after corrective action
Implementation Guidance (brief)