Conventional Fire Alarm Design Tool v1.0
Load your drawing, draw rooms, auto-place smoke and heat detectors to BS 5839-1 or NFPA 72, add call points and sounders, check coverage gaps, split devices into zones and sounder circuits, and export the device schedule and BOQ.
Standard
Place device (tap the plan)
I/O module by interface
Sounders & spacing
Panels & network
Battery (standby power)
Zones & display
Rooms (0)
How to use: 1) Load your plan (PDF, PNG or JPG; export DWG to PDF first) and set the scale on a known dimension. 2) Draw each room or corridor as a rectangle and set its ceiling height and detection type. 3) Auto-place fills each room with the fewest detectors on an even grid so every point is within the coverage radius: BS 5839-1 smoke 7.5 m and heat 5.3 m; NFPA 72 0.7 × spacing (smoke 9.1 m → 6.4 m; heat per listed spacing, reduced for ceilings over 3 m). Red dots show uncovered points. 4) Add call points at exits and on escape routes (BS 5839-1:2025: 45 m travel / 30 m straight line; NFPA 72: within 1.5 m of each exit, 61 m travel), sounders, beacons, modules and the panel. 5) Create zones groups rooms into detection zones (max devices per zone; BS 5839-1: 2,000 m² per zone), puts sounders and beacons on separate sounder circuits (about 1 A each) and estimates cable per circuit. Every circuit is radial and ends in an end-of-line device (EOL). Flat, smooth ceilings assumed: beams, slopes, airflow, voids and stairs need the designer's judgement. Design aid only; confirm with the standard, the product datasheets and the authority having jurisdiction (in KSA, SBC 801 / Civil Defense). Techubox.com
