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Estimate voltage drop in DC, single-phase or balanced three-phase wiring from cable size or resistance.
Use one-way length and identical parallel conductors. Multiply I·L·R by 2 for DC or single phase and √3 for balanced three phase. For lagging AC, R and X contribute through the power factor. Wire-size estimates use nominal resistance near 20 °C; use manufacturer data for the actual cable.
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