1 conductors per phase utilizing a #4 Copper conductor will limit the voltage drop to 2.49% or less when supplying 30.0 amps for 800 feet on a 480 volt system.
For Engineering Information Only:
70.0 Amps Rated ampacity of selected conductor
0.2957 Ohms Resistance (Ohms per 1000 feet)
0.048 Ohms Reactance (Ohms per 1000 feet)
14.399999999999999 volts maximum allowable voltage drop at 3%
11.933. Actual voltage drop loss at 2.49% for the circuit
0.9 Power Factor
21 amps x 125% =26.25 round up to 30 amps for safety .
