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The question is one of voltage loss. The goal is to have enough ampacity in the selected conductors to run the maximum load with only 3 percent voltage drop, caused by the resistance inherent in the wires.
Plug your numbers into a voltage drop calculator online and see what pops out.
At 120 volts you would get 3.1 percent drop using 3/0 wire.
At 240 volts you could drop down three sizes to #1 AWG for 3.1 percent at max load, or 1/0 size for 2.5 percent drop at max load.
Assuming copper wire at normal conditions of temperature.
Wiki User
∙ 11y ago
To determine the wire size needed for a 100 amp load 250 feet away, you will need to consider the voltage and allow for voltage drop. For a 100 amp load at 120V over 250 feet, you would need a wire size of at least 1/0 AWG. It's recommended to consult with a licensed electrician to ensure proper wire size for your specific situation.
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