Assuming the service voltage is 240 volts. A 2/0 aluminum conductor, with an insulation factor of 90 degrees C, will limit the voltage drop to 2% or less when supplying 125 amps for 100 feet on a 240 volt system.
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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.
The main piece of information needed is the load wattage or amperage that will be connected to the power supply. Once this is known the power supply of a greater size that the load should be chosen. Also with this information the size of the wires can be calculated from the power supply to the load. Too small a wire will create a voltage drop at the load end of the circuit. This will cause under performance of the load.
For a 30 amp load at 12 volts DC over a distance of 34 feet, a wire size of at least AWG 8 would be recommended to minimize voltage drop and ensure efficient power delivery. It is important to consult with local electrical codes and standards to ensure compliance with regulations.
AWG # 10 wire on 30 amp circuit.
The wire size needed for a 180' run depends on the voltage, current, and type of installation. It is recommended to consult the National Electrical Code (NEC) and a professional electrician to determine the appropriate wire size to ensure safety and compliance with regulations.