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eng.cable-voltage-drop-IEC Calculator
Calculates cable voltage drop per IEC 60364/IEC 60228 using cable resistance and reactance at power factor and load current. Voltage drop must be limited to 3–5% of nominal voltage (IEC recommendation) — excessive drop causes motor overheating and underperformance.
Inputs
I A
Rate of charge flow (A). I = V/R. Above ~100 mA through the body can be lethal. Fuses protect against overcurrent.
L M
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Vn V
Electric potential difference (V). Drives current through a circuit. Household: 120 V (US) or 230 V (EU/UK).
Rho Ohm Mm2 M
Reference formula or conversion factor shown for context.
A Mm2
Reference formula or conversion factor shown for context.
Results
voltage drop ΔV (V)
Electric potential difference between the two terminals (V). In AC systems, quoted as RMS — 230 V mains has a peak of ~325 V.
voltage drop (%)
Electric potential difference between the two terminals (V). In AC systems, quoted as RMS — 230 V mains has a peak of ~325 V.
total cable resistance R (Ω)
Opposition to current flow (Ω). Ohm's Law: V = IR. Lower resistance means more current for the same voltage.
IEC 60364 limit
Reference formula or conversion factor shown for context.
ΔV = I·2ρL/A
Reference formula or conversion factor shown for context.