3.1Categories of fire alarm system
BS 5839-1 groups fire alarm systems in non-domestic buildings by what they are designed to protect. The right category depends on the building, how it is used and your fire risk assessment.
| Category | Designed to |
|---|---|
| M | Manual system: call points only, raised by people who discover a fire |
| L1 to L5 | Protect life, with automatic detection from the whole building (L1) down to specific areas (L5) |
| P1 and P2 | Protect property, with detection throughout (P1) or in high-risk areas (P2) |
