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Depends upon how far you plan to go with it and what the ordinary operating current of the machine is.

The further away you are, the more resistance there is in the wires and the bigger the wire must be, to avoid damaging the welder with a voltage reduced by the resistance.

For instance, a 240-v 48-A appliance would only get 228 volts at the end of 100 feet of #10 AWG wire because it loses power due to the resistance of the wire.

If you want to go more than 100 feet, you would need larger wires. For 260 feet you would need #6 AWG if you want no more than a 5 percent voltage drop.

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The amperage that you are looking at is probably the secondary output. Go to the nameplate of the welding machine and look for the input voltage and amperage. Most industrial machines usually take about a 30 amp outlet for the welder to be plugged into. If this is the case then a # 10 cab-tire flexible cable will fit the bill. If it is 48 amps on the input then as suggested above a #6 conductor will handle up to 65 amps.

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Q: What size wire required for a 230 volt 48 amp stick welder?
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