Voltage Drop Calculator

STEP BY STEP

How to use voltage drop calculator

1. Check the input units and assumptions.
2. Review the result and example.

IN PRACTICE

Example

Copper, 20°C, DC, 20 A, 30 m, 6 mm²: 3.448 V (1.499% at 230 V).

GOOD TO KNOW

Which formula and assumptions are used?

ΔV = k × I × ρ(T) × L / A; ρ(T) = ρ20 × (1 + α × (T − 20)); k = 2 (DC / 1φ), √3 (3φ). Resistance-only approximation, unity power factor, one-way length. Excludes reactance, connections and ampacity. Three-phase voltage is line-to-line.