Engineering Calculators
Engineering maths separated from market-specific compliance assumptions.
The Engineer Toolkit provides a suite of calculators for the most common fire alarm engineering calculations — battery standby capacity, detector spacing, cable resistance, voltage drop, PSU load, loop capacity, SPL levels, and Ohm's Law.
Universal calculations are kept separate from durations, limits and other compliance assumptions. Inputs and any sourced defaults are labelled so results can be checked against current manufacturer specifications, the adopted code and project requirements.
The toolkit is designed for use on-site and in the office. It needs a data connection; the calculators are not stored on the device for offline use.
Engineering use cases
Real examples from the work fire alarm engineers do every day.
Standby battery sizing for a panel upgrade
Input total current draw and the required standby duration. The calculator returns the mathematical minimum and worked figures; the responsible designer must select the applicable duration and manufacturer derating.
Detector spacing on an awkward floor plate
Input room dimensions and ceiling height. Any spacing limit is explicitly market- and standard-dependent and must be verified for ceiling geometry, obstructions and the adopted design rules.
Cable resistance check before commissioning
Input cable length, CSA, and device loop. Calculate end-of-line resistance to verify it falls within panel specification before commissioning.
Key benefits
- ✓10 calculators covering the most common engineering calculations
- ✓Compliance assumptions identified separately from the underlying maths
- ✓Built for phone use on site (needs a data connection)
- ✓Results formatted for inclusion in design records
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