A, B, C, N and PE Wires

It is best to use standard and standardized wire colors in the application: yellow for A wire, green for B wire, red for C wire, blue for N wire, and yellow-green for PE wire.

The three-phase five-wire system refers to A, B, C, N and PE wires. Among them, the PE wire is a protective ground wire, also called a safety wire, which is specially used to connect to equipment such as equipment casings to ensure electrical safety. The PE line is connected with the N line on the power supply transformer side, but it must not be used as a neutral line after entering the user side. Otherwise, it will be no different from the three-phase four-wire system after chaos occurs. However, since this confusion can easily make people lose their vigilance, it may be more prone to electric shock accidents in practice.

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