Find the lower device-count limit
Circuit Loading Calculator
Compare the panel-output and worst-case end-of-line voltage-drop constraints.
Method context
BS 5839-1:2025 Clauses 11, 15 and 24
The implementation follows the current Swift calculator in the Fire Regs Pro project. It is an estimate for revision and preliminary checking.
Check before use: Confirm the current standard, project specification, manufacturer data, environmental derating and actual site measurements. A browser result is not a design certificate.