Three-pin plug, one of the three thin wires must have a plastic outer covering that is not a plain color (a plain color refers to one color), but must contain two colors, usually yellow and green. This wire is called a flower The wire, we call it the ground wire in the electrician, must be inserted into the hole in the middle of the Swiss plug.

In addition to the ground wire, the left and right wiring are also regularly followed.
There are L, N, E letters on or inside the plug L is Line, live wire; N is Negative, neutral wire; . E is Earth, ground wire.

Corresponding wire color:
The yellow, green, and red colors of the three-phase insulated wire represent the three-phase A, B, and C phases of the AC voltage, respectively.

220V civil electricity, the phase wire is the live wire, generally red or brown, because these two colors are hot colors;

The zero line is blue or green or black;

The ground wire is green and yellow.

Generally, the most commonly used is that the phase wire is red, the zero wire is blue, and the ground wire is yellow and green.

IEC 60446 Specified Cable Colors:
Phase conductors: black, brown, shear, orange, yellow, green, purple, gray, white, pink shear and cyan.
Neutral conductor: blue (light blue), white or grey.
Protective conductor: yellow and green.



example,

Swiss socket