Old 05-21-03, 12:53 PM
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I need to help a friend install a 220 circuit for a welding machine. It has been a long time since I did this kind of wiring. If someone can give me a refresher.
He has a 100amp breaker box. I need to put in a 220 breaker and put that direct to a 220 receptacle. Do I need a seperate fuse between the breaker and the receptacle.
If someone can tell me where I can find a wiring diagram on line it may help.
Please respond here or direct to pulldigm@yahoo.com.
Old 05-21-03, 02:57 PM
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A 240-volt circuit is installed pretty much the same as a 120-volt circuit. The rules for wire size, type, securing and protection are the same.

What's different?
  • You need a double-pole 240-volt breaker instead of a single-pole 120-volt breaker.
  • You attach black and white to the breaker, and nothing to the neutral bar.
  • You need to reidentify both ends of the white wire with black marker.
  • You need to use a 240-volt receptacle.
All else is the same. Choose the amperage rating of the breaker and receptacle based on the requirements of the welder, and choose the wire gauge based on the amperage rating of the breaker and the distance from the panel. These latter considerations are also done in the same way for 120-volt circuits.

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