Cable sizing & voltage drop

Voltage drop for a copper/aluminium run at a given current and cross-section.

Current (A)Run length (one way) (m)Cross-section (mm²)System voltage (V)Material (0=Cu, 1=Al)Phases (1 or 3)

Voltage drop7.47 V

Drop3.25 %

Estimate only — Resistive drop only. Copper ρ=0.0175, aluminium ρ=0.0282 Ω·mm²/m. material: 0=Cu, 1=Al; phases: 1 or 3. Not a substitute for detailed design.