AC Voltage Drop Calculator

Range: at least 0.001 V

Example starting value: 480 V. Replace it with the circuit line voltage.

Range: at least 0 A

Example starting value: 100 A. Replace it with the design or measured load current.

Range: at least 0 ft

Example starting value: 500 ft one way. Enter one-way length; the phase model supplies the return path.

Range: at least 0 ohm/1,000 ft

Example starting value: 0.20 ohm/kft. Replace it with the selected conductor impedance data.

Range: at least 0 ohm/1,000 ft

Use conductor reactance for the selected configuration and spacing. Set to zero only when a resistive-only estimate is intended.

Range: 0–1

Enter the operating displacement PF for the voltage-drop approximation. For significant harmonics or variable loads, use a study method instead.