Choosing the wrong cable size isn't just inefficient—it's dangerous. Undersized cables overheat, cause voltage drops, and can start fires. Oversized cables waste money and are difficult to install.
So, how do you calculate the exact size you need? You don’t need a crystal ball; you need and the Voltage Drop Formula . how to find the cable size formula
[ \boxedA = \frac2 \rho I LV_d ]