Cable Cross-Section Calculator
Calculation of required cable cross-section with voltage drop.
READY
cable_crosssection_calculator.tool
READY
// HOW IT WORKS
The required conductor cross-section depends on current, cable length, voltage and the permitted voltage drop. The tool estimates the cross-section for copper cables.
Voltage drop (single-phase)
ΔU = 2 * L * I * ρ / A (ρ_copper ≈ 0.0178 Ω·mm²/m)
Example
I = 16 A, L = 30 m, A = 2.5 mm² → ΔU ≈ 2·30·16·0.0178/2.5 ≈ 6.8 V.
Notes
- For three-phase the factor 2 is dropped (√3 consideration instead).
- Standards/VDE and the installation method are authoritative — the tool is an estimate.