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Voltage Drop Calculator

Article Details

Last Updated
6th of October, 2018

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Select wire type:
Enter wire diameter size:
Enter wire length:
Select current type:
Enter voltage in volts: V
Enter current in amps: A
Voltage drop in volts: V
Percentage of voltage drop: %
Wire resistance: Ω

* @ 68°F or 20°C; ** Results may change with real wires: different resistivity of material and number of strands in wire,
DC Vdrop / AC single phase calculation,
Vdrop (V) = Iwire (A) × Rwire (Ω) = Iwire (A) × (2 × L(ft) × Rwire (Ω/kft) / 1000(ft/kft)),
AC three phase calculation,
Vdrop (V) = 0.866 × Iwire (A) × Rwire (Ω) = 0.866 × Iwire (A) × (2 × L(ft) × Rwire (Ω/kft) / 1000(ft/kft)),

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