NEC Voltage Drop Calculator
Uses NEC Ch. 9 Table 8/9 (resistance & reactance) and Table 310.16 ampacity. Always verify with your AHJ/manufacturer.
System Parameters
Input Parameters
Notes: Results use NEC Ch. 9 Table 8 (DC) and Table 9 (AC) resistance/reactance for uncoated copper and aluminum at 75°C. Ampacity per NEC Table 310.16 at the selected temperature rating. Power factor applies to AC only. Calculator is for AWG/kcmil sizes and assumes balanced loads. Always verify against the full NEC and your AHJ.
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