All table values are based on NFPA 70, NEC 2014.
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Single-Phase | Three-Phase | |
---|---|---|
Voltage Drop (V) | \begin{align}\frac{2KIL}{A_{CM}}\end{align} | \begin{align}\frac{\sqrt{3}KIL}{A_{CM}}\end{align} |
Circular mil area (ACM) | \begin{align}\frac{2KIL}{VoltageDrop}\end{align} | \begin{align}\frac{\sqrt{3}KIL}{VoltageDrop}\end{align} |
Resistance change due to temperature relative to 75℃ | \begin{align}R_2 &=R_1[1 + \alpha(T_2 - 75)]\\\alpha_{cu}&=0.00323\\\alpha_{al}&=0.00330\end{align} |
Visit https://www.mikeholt.com/technnical-voltage-drop-calculations-part-two.php for a detailed explanation of voltage drop calculations.