3 Wire 220V Wiring Diagram - Wiring Diagram And Schematic Description: How To Wire 240 Volt Outlets And Plugs within 3 Wire 220V Wiring Diagram, image size 750 X 328 px, and to view image details please click the image. Here is a picture gallery about 3 wire 220v wiring diagram complete with the description of the image, please find the image you need. Understanding 220 or 240 volt Electrical Circuits That is why some 240 volt circuits have four wires: 1) A black wire which is often known as the "hot" wire, which carries the current in to the fixture. 2) Another "hot" wire which is red, which also carries current in to the fixture. 3) A white wire called the neutral which completes the electrical circuit for the 120 volt accessories only. 240V 3 Phase and 240V Single Phase • OEM Panels 240V power is used in the US and parts of the world. In the US 120 / 240V 1 Phase 3 Wire is the standard for homes and 240V 3 Phase Open Delta is the standard for small buildings with large loads. In parts of the world 240V Single Phase 2 Wire is the standard for homes's more. electrical - How can I make a 240 volt 4 wire to 3 wire The air conditioner arrived today and has only 3 conductors on the power cord. I looked up the configuration and determined that it's a 240v 15 amp set up. I want to make a short extension cord, about 6 ft, to connect the 3 conductor plug from the AC to the 4 conductor 240v wall receptacle.