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Voltage Drop Calculator
This calculator computes voltage drop in a cable line using the formula from IEC 60364 and GOST R 50571. All calculations are performed client-side — your data never leaves the browser.
How the calculation works
• For single-phase (230 V): ΔU = (2 × I × L × ρ × cos φ) / S • For three-phase (400 V): ΔU = (√3 × I × L × ρ × cos φ) / S • ρ (copper) = 0.0175 Ω·mm²/m, ρ (aluminum) = 0.028 Ω·mm²/m • ΔU% = (ΔU / U_nom) × 100% • Limits: < 3% — excellent, 3–5% — acceptable, > 5% — exceeded per IEC.