Mandatory design certificate per BS 5839-1:2025.
| Device | Qty |
|---|---|
| Optical Smoke | 12 |
| Multi-sensor | 3 |
| Manual Call Point | 2 |
| Sounder + VAD | 4 |
| I/O Interface | 2 |
| Total | 23 |
BS 5839-1 Cl. 33.5.1
No soak test is necessary: this system has 15 detectors, within the 50 up to which Cl. 33.5.1 requires none.
No variations from BS 5839-1 recommendations recorded for this design.
I certify that this design complies with BS 5839-1:2025 save for the variations recorded above.
As-designed device count for D-350 · Cyclic Fix Verification — L2 fire alarm design.
| Device | Category | Qty |
|---|---|---|
| Optical Smoke | detection | 12 |
| Multi-sensor | detection | 3 |
| Manual Call Point | manual | 2 |
| Sounder + VAD | notification | 4 |
| I/O Interface | interface | 2 |
| Total devices | 23 | |
Logical zones grouped by device function for D-350. Physical detection-zone boundaries (Clause 13) are defined on the as-designed drawing.
| Optical Smoke | 12 |
| Multi-sensor | 3 |
| Zone total | 15 |
| Manual Call Point | 2 |
| Zone total | 2 |
| Sounder + VAD | 4 |
| Zone total | 4 |
| I/O Interface | 2 |
| Zone total | 2 |
Departures from BS 5839-1 recommendations for D-350, recorded with justification under Clause 6.
No variations recorded — the design conforms to BS 5839-1 without departure.