480v to 240v Transformer Wiring Diagram | Free Wiring Diagram 480v to 240v Transformer Wiring Diagram - Collections Of 480 Volt to 120 Volt Transformer Wiring Diagram Image. 480v 3 Phase Transformer Wiring Diagram Step Down Tags to 120v. Step Down Transformer 480v 120v Wiring Diagram Trusted Wiring. 480v to 120v Transformer Wiring Diagram Elegant 3 Phase Step Down. 3 Phase Wiring for Dummies – Understanding Motor A three-phase motor must be wired based on the diagram on the faceplate. The first step is to figure out the voltage of your phases. In the United States, for low voltage motors (below 600v), you can expect either 230v or 460v. That being said, there is a wide range of different motors and what you have on hand can be completely different.