How do I calculate Voltage Drop — Single Phase AC?

To calculate Voltage Drop — Single Phase AC: Enter Cable length (one way), Current I, Conductor cross-section and other values. Click Calculate. INDUGRID computes the result instantly using the formula: Uv = 2 × ρ × L × I × cos(φ) / A [ρ_Cu = 0.01754 Ω·mm²/m @ 20°C]. No registration required.

What units does the Voltage Drop — Single Phase AC calculator use?

The Voltage Drop — Single Phase AC calculator uses the following units: m, A, mm², V. SI units are used by default.

Is the Voltage Drop — Single Phase AC calculator free?

Yes. The INDUGRID Voltage Drop — Single Phase AC calculator is completely free, requires no account or login, and works on desktop and mobile browsers.

Electrical Engineering

Voltage Drop — Single Phase AC

Calculate voltage drop in single-phase AC cables from current or power, cable length and conductor cross-section.

Units:

in LinkedIn

💡Maximum permissible voltage drop per IEC 60364: 3% for lighting circuits (6.9V at 230V) and 5% for motor circuits (11.5V at 230V). Excessive voltage drop causes motor overheating, reduced torque and equipment malfunction.

Uv = 2 × ρ × L × I × cos(φ) / A [ρ_Cu = 0.01754 Ω·mm²/m @ 20°C]

Input

Cable length (one way) iOne-way cable length in metres. The return conductor is automatically included (factor 2).

Current I iCurrent through the cable in Ampères.

Conductor cross-section iConductor cross-section in mm². Standard: 0.75 | 1.0 | 1.5 | 2.5 | 4 | 6 | 10 | 16 mm².

mm²

Power factor cos φ iPower factor. 1.0 = pure resistive load. Motors typically 0.75–0.92.

Supply voltage iAC supply voltage in Volts.

Conductor material iConductor material. Copper ρ=0.01754, Aluminium ρ=0.02830, Iron ρ=0.12048 Ω·mm²/m.

Result

Voltage drop Uv [V] —

Percentage drop [%] —

Residual voltage [V] —

IEC 60364 assessment —