Voltage Drop Calculation: Worked Examples
5:32
The farther the wire run, the more voltage lost — there's an exact formula for it.
In this lesson: the voltage drop formula (single-phase and three-phase), K values for copper and aluminum, five full worked examples (including upsizing a failing circuit until it passes), why motors are extra sensitive to voltage drop, the one-way-vs-round-trip trap, and the alternate I×R formula.
Based on the 2023 NEC (210.19(A) and 215.2(A) Informational Notes).
