Understanding 120/240V Wiring Color Code | DoItYourself Homes in North America are supplied with a 120/240V single-phase electrical service. The incoming 240V power is split onto two legs. Each leg can provide 120V hot-to-neutral, and the two legs together will supply 240V, which is used to supply heavy loads such as air conditioning compressors andAuthor: DIY Staff How to Wire a 240V AC Outlet - instructables How to Wire a 240V AC Outlet: We were given a welder that has a big 240 volt plug, but our home doesn't have any 240V outlets already wired. What to do? Wire your own! Turns out the plug we had is NEMA 6-50. You can probably figure out what yours is from a chart. If it's clo..