Voltage Drop Calculator
Find voltage loss in a wire from length, current, and conductor size.
CALCULATE
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Formulas
Vdrop = 2 × I × ρ × L / AFactor of 2 accounts for the return path.
Why Voltage Drop Matters
NEC recommends max 3% for branch circuits, 5% total. Copper resistivity: 0.0175 Ω·mm²/m. Aluminum: 0.0283.
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