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Q: Size wire for running 240v 130 amps mig welder?

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You first have to determine how many amps the welder draws. From this amperage, the correct wire size is determined. Depending on what the wire size is governs the size of the breaker to be used.

It depends on the voltage source in question. watts = volts * volts / resistance and amps = volts / resistance example 1: Producing 7kW from a 120V source will require a resistor of size: 120V*120V/7000W = 2.05 Ohm And this will pull 120V/2.05Ohm = 58.3 Amps of current. example 2: Producing 7kW from a 240V source will require a resistor of size: 240V*240V/7000W = 8.23 Ohm And this will pull 240V/8.23Ohm = 29.2 Amps of current.

It depends on the voltage source. watts = voltage * voltage / resistance and amps = voltage / resistance example 1: To produce 600W from a 120V source, you need a resistor of size 120V*120V/600W = 24 Ohm. This would pull 120V/24 Ohm = 5 amps. example 2: To produce 600W from a 240V source, you need a resistor of size 240V*240V/600W = 96 Ohm. This would pull 240V/96 Ohm = 2.5 amps.

Power= Volts X Amps. E.G. An electric heater element running on a 240V power supply, drawing 10 Amps. 240V X 10A = 2400 Watts, or 2.4 kW.

Wire size depends on amps. Use #10 for 30a. #8 for 40 or 50a. #6 for 60a.

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Generators are rated in watts or kilowatts. The formula for watts is W = Amps x Volts. To size a generator for the welder the voltage of the machine must be stated.

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 have to check the amperage draw of the welder, it should be on the welder nameplate. Use this formula Amps = Watts / Volts. 5000/220 = 22.7 amps. If you welder draws more that this figure then the generator will overload.

yes, 31watt divide 240v equals to 0.13amps.

You can using a transformer, but you won't have as many amps available. 5000 watt generator @ 120v = 41.66 amps 5000 watts / 240v = 20.83 amps

In 50 VA the V stands for volts and the A is for amps. Hence the formula you are looking for is 50/240 = Amps.

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