Wire Size (A):

\[ A = \frac{10.8 \cdot Nw \cdot L \cdot I}{Vd \cdot E} \]

Where:

• \(A\) is the area of the wire in circular mills.
• \(Nw\) is the number of wires.
• \(L\) is the length of the wire in feet (ft).
• \(I\) is the current flowing in amperes (A).
• \(Vd\) is the allowable voltage drop (decimal, typically 0.02).
• \(E\) is the voltage in volts (V).