Check end-of-line voltage
Cable Voltage Drop Calculator
Estimate copper loop resistance, voltage drop and device voltage at the circuit end.
Method context
BS 5839-1:2025 Clause 25 / BS 7671 conductor data
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.