Fire Alarm System Requirements: NFPA 72 and Salamah Compliance Guide

System types: addressable vs. conventional

Addressable systems

Each device has a unique digital address, allowing the fire alarm control panel to pinpoint the exact location of any alarm or fault. Addressable systems are recommended for medium and large facilities, multi-storey buildings, and any project where rapid identification of the alarm source is critical. They also simplify maintenance, since faults are reported device by device.

Conventional systems

Devices are wired in zones rather than individually addressed. The panel reports an alarm at the zone level, not the device level. Conventional systems remain acceptable for small buildings with a limited number of zones, but most new commercial projects in KSA default to addressable.

Core components of a compliant system

Fire alarm control panel (FACP)

The brain of the system. It must be UL-listed, sized for the loop count and device load of the project, and located in an attended or routinely visited area. Networked panels are required for large or multi-building campuses.

Initiating devices

• Photoelectric smoke detectors for general areas — they respond well to smouldering fires.
• Heat detectors (rate-of-rise or fixed-temperature) for kitchens, mechanical rooms, and dusty environments where smoke detectors would generate false alarms.
• Beam detectors or aspirating systems (VESDA) for warehouses, atriums, and high-ceiling spaces.
• Duct detectors in HVAC return ducts to shut down air handling on smoke detection.

Manual call points

Installed near every exit and along egress paths so an occupant is never more than ~60 metres of travel from a call point. Mounting height is approximately 1.4 metres above finished floor, accessible and unobstructed.

Notification appliances

Horns, sounders, and strobes that meet the audibility and visibility thresholds in NFPA 72 — typically 15 dBA above ambient sound level, with strobe coverage in any space where occupants may not hear an audible alarm.

Power supply and standby batteries

The system must operate on primary power and on standby batteries sized for at least 24 hours of standby plus 5 minutes of full alarm. Voice evacuation systems require 15 minutes of alarm at the end of the standby period.

Installation requirements

• Fire-rated cabling. Initiating and notification circuits use FRLS (flame retardant low smoke) or LSZH (low smoke zero halogen) cable, often in EMT or GI conduit.
• Loop continuity. Class A wiring with isolation modules is preferred so a single fault does not disable a circuit.
• Device spacing per NFPA 72. Smooth-ceiling smoke detectors are spaced at a maximum of approximately 9 metres on centre, with closer spacing required for sloped or beamed ceilings.
• Clearance from air diffusers. Smoke detectors must be kept at least 0.9 metres from any HVAC supply diffuser to avoid air dilution that prevents activation.
• Accessibility. No detector should be installed where it cannot be reached for routine testing and cleaning.

Integration with other building systems

A fire alarm system rarely operates in isolation. NFPA 72 and Civil Defense both require it to be integrated with the rest of the life safety package:

• HVAC shutdown on smoke detection in supply or return ducts.
• Elevator recall (Phase 1) on lobby smoke detection, sending cars to a designated floor.
• Magnetic door release on fire doors held open by hold-open devices.
• Activation of pre-action and clean agent suppression systems where installed.
• Interface with access control to release egress doors on alarm.
• Monitoring of waterflow, tamper, and supervisory signals from sprinkler and standpipe systems.

Testing and commissioning

Before Civil Defense will issue an approval, the installed system must pass a documented commissioning regime that includes:

• Loop testing for continuity, ground fault, and short circuit.
• 100% device activation testing — every smoke detector with smoke or canned aerosol, every heat detector with the appropriate test method, every manual call point operated.
• Audibility measurements at multiple points throughout the building to confirm the 15 dBA threshold.
• Battery discharge testing to validate the 24-hour standby + 5-minute alarm requirement.
• Verification of every integrated function — HVAC, elevators, doors, and suppression triggers.

Common compliance issues

• Detector coverage gaps left by ceiling renovations or partition changes.
• Faulty or unterminated wiring discovered only at commissioning.
• Improper zoning that does not match the building compartmentation.
• Disabled circuits or muted panels that defeat the system entirely.
• Missing or non-NFPA 72 documentation at the time of inspection.