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. How to Wire a Single-Phase 230V Motor | Hunker Single-phase motors are used to power everything from fans to shop tools to air conditioners. Residential power is usually in the form of 110 to 120 volts or 220 to 240 volts. Wiring a motor for 230 volts is the same as wiring for 220 or 240 volts. Some motors allow both 120-volt and 240-volt wiring by providing a combination of wires for doing so. Home Electrical Wiring- Diagram and Installation Basics A diagram of a single-phase 120/240V service. HOME ELECTRICAL WIRING BASICS Whether you are considering a backup power system, want to add another electric circuit, or are going to install a new appliance, it is important to understand the home’s electrical wiring basics and applicable codes.