Understanding 120/240V Wiring Color Code | DoItYourself Understanding 120/240V Wiring Color Code By Plastic sheathed, or Type NM (NonMetallic), cable, is widely used for home wiring circuits. Modern Type NM cables have different color sheathing which indicates the size of the conductors: White for 14AWG (American Wire Gauge) conductors, Yellow for 12 AWG conductors, and Orange for 10 AWGAuthor: 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..