12/2 with ground.
10 gauge
Use AWG # 3 copper.
To answer this question a voltage needs to be stated. Wire is sized by the amount of amperage the load takes. W = Amps x Volts. Amps = 650/ volts.
The wire size depends on the amperage, not the voltage. The fact that the welder runs on 440 volts does not affect the wire size! You need to ask this question instead: What size wire do you need for a three phase welder on an eight foot run if the nameplate amps are 45A?
You will need AWG #3 if it is a short run.
The wire size and the circuit breaker for a 125 hp motor must consider the length of lead wire to the motor (essentially the distance of the motor from the supply). 125 hp is a VERY large motor and would be used only in industrial applications. You will need to consult a technician for proper advice, but the general answer to your question follows: The current draw on such a large motor would be approximately 300 amps. That is very large, and would require a wire size of 0000 AWG or 750M. 0000 AWG is 0.46 inches (11.68 mm) in diameter. As you can see, the wire is very large. It is not something you could install yourself.
You need to know the amperage to size the wire. For 220 V at 20 A you would need 12 AWG. At 220 V at 30 A 10 AWG.
Depends upon the voltage. The formula for amperage or (wire size) is Watts / Voltage. If the voltage is 220 volts, then the amperage would be over 400 amps. This would require a large wire size to run it. If it were 440 volts, the amperage would be 1/2 or 200 amps. That would require a smaller wire size. As the voltage goes up, the amperage goes down. At a thousand volts, the amperage would only be 90 amps. A wire gauge or size of a #2 would carry 90 amps for small distances.
First of all find out what voltage the motor is designed to work on.
If the motor is operated from a three phase three wire distribution system the motor will not need a neutral wire.
A breaker is sized by the wire size. The wire is sized by the amperage. The formula for amperage is I = W/E. Amps = Watts/Volts. As you can see with no voltage stated an answer can not be given.
No, 14-2 wire is typically rated for 120 volts. For 230 volts, you would need to use a heavier gauge wire such as 10-2 or 12-2 to handle the higher voltage and current. It's important to always use the correct wire size for the voltage and current requirements to ensure safety and proper operation.