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ENGINEER TOOLKIT
Fire alarm calculations and field tools in one place.
Fast, mobile-friendly tools for calculations, addressing, manufacturer panel workflows, one-man testing, disablements, cause & effect, commissioning and fault finding.
Reference baseline
BS 5839-1:2025
Non-domestic premises
Important: This hub is an engineering aid, not a substitute for the current British Standard, fire strategy, risk assessment, approved design, panel certification or manufacturer instructions.
ENGINEER ACCESS
Protected engineer tools
The dashboard is available without a password. Calculators, addressing tools, testing guides, manufacturer pages and the knowledgebase require the site passcode.
๐Battery sizeStandby + alarm load + margin
โปLoop capacityAddresses, quiescent & alarm current
AApollo addressXPERT pips & DIL switches
โฏVoltage dropCable resistance and minimum voltage
โ Fault finderStructured checks for common faults
โCommissioningField-ready test sequence
KBManufacturer KnowledgebasePanel workflows, protocols & testing
1MOne-man testingWalk tests and safe restoration
C&ECause & effectLogic, groups and staged operation
FIELD NOTES
Engineer scratchpad
QUICK FORMULAS
Useful reminders
V = I ร ROhm's lawP = V ร IDC powerVdrop = I ร RloopCircuit voltage dropAh = A ร hoursIdeal battery capacity before marginsRloop = 2 ร L ร ฮฉ/km รท 1000Two-core DC loop resistance