When designing a fire alarm system, the first decision is the type of system: conventional or addressable. Both are acceptable and perform the alarm function, but each suits a different building size. The wrong choice can mean a system that is cheap at first but costly to maintain and troubleshoot, or an advanced system a small shop does not need. This guide explains how each system works, compares them on location, cost, wiring, faults, expansion and integration, and helps you choose for your facility.
How Does Each System Work?
- Conventional: detectors are wired on circuits called zones. On alarm the panel knows only the zone, then the team searches for the detector within it.
- Addressable: each detector or device has its own address. The panel shows the exact location (for example: third floor, room 305).
Comparison
| Item | Conventional | Addressable |
|---|---|---|
| Location | Zone | Specific device |
| Initial cost | Lower | Higher |
| Wiring | A circuit per zone | One loop serving many devices |
| Faults | Harder to locate | The panel identifies the faulty device |
| Expansion | Limited | Flexible |
| Integration with systems | Limited | Wider (suppression, ventilation, lifts, doors) |
| Event log | Limited | Detailed, helping maintenance and investigation |
A Practical Example
In a five-floor building with a conventional system, the panel shows "alarm in zone 3", which may cover a whole floor with twenty rooms, so the team searches room by room. An addressable system shows "smoke detector, floor 3, room 305", so the team goes straight there. For faults, an addressable system identifies the failed or dirty detector instead of testing the whole circuit.
Which Should You Choose?
| Facility | Likely system |
|---|---|
| A small shop or office | Conventional |
| A medium restaurant or salon | Conventional or addressable depending on area |
| A hotel or hospital | Addressable |
| A multi-storey building or shopping complex | Addressable |
| A large factory or warehouse | Usually addressable |
In large buildings, the time saved locating a fire and device faults justifies the higher cost. Read examples: Requirements for hotels and Requirements for shops.
Integration With Building Systems
On alarm, an addressable system can shut down air conditioning to stop smoke spreading, send lifts to the ground floor, release magnetic doors, and trigger gas suppression systems. Read: The FM-200 system.
The Reference
System design is subject to the Saudi Fire Code (SBC 801), and the designer chooses the type according to the building. Read: Fire alarm system requirements.
Frequently Asked Questions
Can a conventional system be converted to addressable?
It is possible by changing the panel and devices, and some wiring may be reused depending on the case.
Is an addressable system mandatory?
The type is set by the design, building size and code requirements; it is not mandated by name in every case.
Is addressable more expensive to maintain?
It is usually easier to maintain because it pinpoints faults, saving technicians' time.
Can both be combined in one facility?
Some conventional devices can be connected to an addressable panel via special modules, depending on the system design.
What does the design need?
Approved drawings showing devices, loops and the control panel. Read: Fire system drawings.
How Abak Engineering Consultancy Helps
Abak is an accredited engineering office in Riyadh that selects the right alarm system type for your facility and designs it to SBC 801, integrated with building systems and with approved drawings. See our alarm and fire-fighting systems design service, or contact us.
Regulatory information is based on the Balady platform and the Ministry of Municipalities and Housing, and procedures may be updated by the competent authority. Last reviewed: October 2026.