Voltage drop calculator
Check the voltage drop of an existing or planned line. Enter the current, length, conductor section and voltage: the tool gives the drop in volts and as a percentage, to compare with the allowed limit.
- Voltage drop
- 4.14 V
- Voltage drop
- 1.04 %
- Within limit (≤ 5 %)
Indicative result: always verify against the standards and the installation method on site.
Formula
ΔU = (k × ρ × L × I × cos φ) / S · ΔU% = ΔU / U × 100
Good to know
- Typical limits: 3 % lighting, 5 % other uses (motors).
- Above that, increase the section or reduce the length.