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Sources
- IAEI Magazine, "Voltage Drop Calculations" (Sept 2019): VD formulas, K = 12.9 Cu / 21.2 Al from NEC Ch. 9 Table 8 at 75 °C
- AWG diameter definition (ASTM B258), summarized
- NFPA 70 (NEC), free read-only access at NFPA
- NFPA NEC enforcement maps (which edition your state uses)
Formulas checked against the sources above and our worked-example tests on 2026-10-16. Code sections are cited by number only; read the text in your adopted edition. Planning aid, not engineering, legal or code advice.