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How to wire a 220 outlet 
Check with the national and local electrical codes. 
Make sure you understand all the requirements for wiring a 220-volt outlet. 
Choose the correct wire size and type for the appliance.
A label should give the amperage rating of the appliance, and this will determine the wire size. An example would be a 20 amp air conditioner requiring a 12 gauge wire, typically a 3 wire plus ground romex cable.