DEVELOPED FOR MEP ENGINEERS · DESKTOP BUILD
MEPVirtual

Fire Alarm System Virtual Lab

GENT · MORLEY · ESSER · NOTIFIER · EDWARDS · SIMPLEX · SIEMENS
Interactive · EN 54-17 / BS 5839-1

One fault
should never
silence a floor.

On a correctly configured addressable ring loop, a single open-circuit fault is detected and reported by the panel, while devices on both sides of the break can normally remain operational through communication from the opposite direction. A short circuit can remove a section of the loop from service unless short-circuit isolators (BS EN 54-17) contain the fault. Set the isolator spacing below and run a fault to see the difference between the BS 5839-1 minimum and a typical project requirement.

2000 m²
max area lost to 1 fault, BS 5839-1
EN 54-17
short-circuit isolator standard
1:1
Project spec - isolator per device

LOOP FAULT SIMULATOR

LOOP HEALTHY
24 devices on loop · 3 isolators placed · panel polling both directions. Click "Simulate short circuit" to inject a fault at a random point on the ring.

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Power + data (combined) Isolator

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About this lab: Fire Alarm Design, Loop & Battery Calculation Virtual Lab

Fire Alarm Design, Loop & Battery Calculation Virtual Lab

Explore fire alarm loops, addressing, battery calculations, drawings and commissioning checks through an interactive engineering training lab.

Topics you can explore

  • Fire alarm loop design
  • Fire alarm battery calculation
  • Fire alarm commissioning

Practical engineering example

Trace a loop fault and review which devices remain available. Check the cause-and-effect requirements and verify standby/alarm battery duty against the selected equipment data.

Developed by Eng. Mannan Maqsood. Verify design outputs against current project requirements and the applicable authority and manufacturer data.

© 2026 Eng. Mannan Maqsood | Engineering Excellence Through Interactive Labs

VERIFY ALL FIGURES AGAINST CURRENT MANUFACTURER DATASHEETS AND LOCAL AUTHORITY REQUIREMENTS BEFORE DESIGN SIGN-OFF.