Quiescent current
The current a system draws in normal standby, from panel and all devices together; the first input to any battery calculation.
Loop devices often dwarf the panel's own figure — never use the panel datasheet alone.
Fire Engineering Glossary
Technical terms spanning standards, manufacturers, commissioning, networking, testing and fault finding.
Technical guidance only. Confirm current project requirements against the applicable standards, legislation, system documentation and site-specific fire strategy.
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Standby battery calculation
Sizing batteries from standby current × standby duration plus alarm current × alarm duration, with the required safety margin, rounded up to a standard battery size.