Voltage Loss
Voltage loss is calculated using OHM's Law:
E = I x R
E is the voltage loss in volts
I is the current in amperes
R is the resistance of the wire in ohms
The diameter, length, and type of metal used in the wire affect voltage drop.
You can find a complete discussion of voltage loss at
Paige Electric's
website, including formulas for voltage loss in single-phase and three-phase
applications, examples, and wire resistance charts.