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The existing 4 wires meaning Red, Black, White, Bare? Red and black are "hot" (using 120V from each phase of your service entrance), white is neutral, and bare is ground. Ground the bare or green wire to the electrical box then use red and black as your hot wires and white as neutral. You must ground the welder itself also with a jumper wire in order to be safe.

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18y ago
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14y ago

most of the time you need to run a new wire containing two lines a neutral and a ground.

If this wire is already run and it has a 3 prong outlet attached the what you need to do is turn off power. the check and make sure it is actually off. then when you disconnect the old outlet the new outlet gets wired with the two hot wires on the hot terminals the neutral on the neutral terminal and the ground on the ground terminal. If you need help determining which terminal is which let me know what type of outlet you are trying to install and i can get the schematics for it.

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Q: How do you change a 4-wire 240V plug for a dryer to a 3-wire 240V plug for a welder and which wires do you use?
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How can you connect a welder to a dryer receptacle?

First you need to know that an electric dryer is almost always a 30 amp 220 Volt power supply. Most small welders require a 50 amp 220 volt power supply. Check your welder's power requirement. If it requires 50 amps, it'll never work correctly on 30 amp.The plug conversion is simple. The wire your dryer is powered by will have two "hot" legs, the red and black wires. These supply the 220 volt. Then it has a ground (bare copper or green conductor. And last it has a white wire, the neutral.Your 3 prong plug on your welder only requires the two "hot" legs and the ground wire. You shunt the neutral white wire with a wire nut.


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