1. Generally speaking, the colors of the power cords are different from each other. Generally speaking, the colors of the three-color wires are yellow, green, and red, which are three phases of A, B, and C. For example, it is like blue. It belongs to the neutral wire. The yellow, green, and red wires are connected to the ground wire. When wiring, the yellow, green, and red wires are connected to the live wire. The blue is connected to the neutral wire. The yellow and green wires are connected to the PE protection wire or connected to the equipment shell. (The shell has been connected to the ground network). Sometimes the color of the four lines is not very easy to distinguish, so you can use the same three cross-sections as the live line, and the smaller the cross-section is the zero line.
2. Speaking of the power supply of the transformer control circuit, generally speaking, it is 380V, and it can be connected to any two live wires; if it is 220V, then just connect one live wire and one neutral wire.
