Electrical Voltage Drop Calculator (Single & Three-Phase)

Check voltage lost over long wire runs and automatically find the minimum Copper or Aluminum wire gauge to stay under the NEC 3% branch limit.

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3. Voltage Drop Calculator (NEC 3% Branch / 5% Feeder Rule)

System Phase

Conductor Metal

System Voltage (V)

Wire Gauge

One-Way Run Length (Feet)

Load Current (Amps)