How to Wire a 220 Outlet: 14 Steps (with Pictures) - wikiHow Check with the national and local electrical codes. Make sure you understand all the requirements Choose the correct wire size and type for the appliance. A label should give the amperage rating of Locate your outlet less than 200 feet (61.0 m) of the panel box. This will prevent a voltage drop that Determine whether to use 3 conductors or 4 conductors. If you are replacing an older appliance, See all full list on wikihow Understanding 220 and 230 Volt Wiring | DoItYourself Understanding 220 and 230 Volt Wiring Understanding 220 and 230 Volt Wiring Using 240 volt wiring for residential homes is a necessity, for powering some heating and cooling equipment as well as large appliances. 220 volt circuits are now commonly known as 240 volt circuits.