1) Why Integrate Systems with the Fire Alarm?

NFPA 72 Chapter 21 sets the minimum requirements for Emergency Control Function Interfaces. Integration allows the fire alarm system to send control signals to other systems and monitor their status so occupants can evacuate safely and first responders can operate effectively.

NFPA 72 governs the fire alarm portion of the interconnection. The other systems remain governed by their own standards (e.g., NFPA 13, NFPA 20, NFPA 92, ANSI A17.1/CSA B44). For complex facilities, use NFPA 3 (commissioning) and NFPA 4 (integrated testing) for end-to-end verification.

2) Elevators: Recall & Power Control

• Recall triggers: Smoke at lobbies/machine rooms initiates Phase I recall to designated levels.
• Integrity & power: Interfaces must be supervised and provided with primary/secondary power per NFPA 72.
• Dedicated control: In buildings without a full FAS, use a dedicated function FACP for recall monitoring and power.

3) HVAC & Smoke Control

• Monitoring: Detectors used for AHU shutdown/dampers/fans must be supervised for integrity.
• Duct detectors: Supervisory signal by default (unless required as alarm by local codes or special conditions).
• Zone coordination: Fire alarm initiating zones must align with smoke control zones.
• Priority: Smoke-control actions override CO-based ventilation in a fire event.
• Manual control: Provide a Firefighter’s Smoke Control Station (FSCS) for manual override in combination systems.

4) Doors, Shutters & Dampers

Interconnect door and shutter hold-open releases, closers, and smoke dampers so they close on alarm. Supervise the interface and document the sequence in the cause-and-effect matrix.

5) Fire Pumps

• Pump running: Alarm or supervisory signal (per design and AHJ).
• Other signals: Supervisory (e.g., controller trouble, phase reversal).
• Valves: Supervise any valve between pump/suppression and initiating devices.

6) Suppression & Releasing Systems

• Actuation: Suppression activation annunciates alarm/supervisory at the FACP.
• Releasing service: Connect releasing FACP to the protected premises FACP and annunciate all signals.
• Integrity: Actuating device circuits must comply with integrity rules; supervise intervening valves.

7) Access Control & BMS

Program fire alarm outputs to release egress doors (fail-safe), drop magnetically locked doors, and send status to BMS/central command displays. Ensure the fire alarm retains command priority over non-life-safety systems.

8) Interface Wiring Classes & Supervision

• Pathways: Use Class A/B/D/N/X between FACP and interface device; monitor integrity per Chapter 12.
• Location: Place interface relays within ~3 ft (0.9 m) of the controlled component unless using Class D.
• Power limits: Ensure interface devices operate within FACP voltage/current limits.

9) Commissioning & Integrated Testing

Develop an integrated cause-and-effect matrix. Perform full end-to-end tests covering initiating events (smoke, waterflow) through outputs (fans, doors, elevators), including power-failure and fault scenarios. Document results for AHJ acceptance.

10) Compliance Checklist

FAQ

Do I need a separate panel for elevator recall?

If no full protected premises FAS exists, a dedicated function FACP for elevator recall is typically required so the recall system is supervised and powered per NFPA 72.

Should duct detectors trigger an alarm?

By default, duct detector activation is supervisory. Alarm initiation may be required by local codes or where no constantly attended location/supervising station exists.

What pathway class should I use?

Use Class A/B/N/X (or D for certain control circuits). The interconnection must be monitored for integrity between the FACP and the interface device.