What line does the wire color represent?

Generally speaking, blue is the zero line, and yellow and green are the grounding lines. In practice, safety is red as the fire line, blue as the zero line, and yellow or yellow and white as the ground line.

1, three-phase conductors are yellow, green and red, A, B and C respectively, blue is the zero line, and yellow and green is the grounding line. When wiring, the yellow, green and red lines are connected to the zero line, and the yellow-green line is connected to the PE protection line or the equipment shell (the shell has been connected to the grounding grid).

2. Sometimes when the colors of the four lines are not clearly distinguished, the three lines with the same cross section are the live lines, and the smaller cross section is the zero line. The transformer can be the power supply of the control loop, such as 380V, connected to any two live wires; If it is 220V, connect the live wire and the neutral wire.

3. For safety, red is the fire line, blue is the zero line, and yellow or yellow and white is the ground line. Generally, the phase line is yellow-green-red, the protective neutral line (pen line) is black, and the protective line (PE line) is yellow-green. In any case, the protective wire is strictly prohibited to be used as the phase wire.

4. According to the stipulation in the Code for Construction of Residential Decoration Engineering (GB 50327-200116.1.4): "When wiring, the colors of the phase line and the zero line should be different; The color of the phase line (L) of the same residence should be uniform, the neutral line (N) should be blue, and the protection line (PE) must be yellow-green double-color line ".

5. Protection wire (PE), that is, the ground wire must be (mandatory) yellow-green double-color wire, the zero wire should be blue (optional, blue wire should be selected when conditions permit), and the phase wire is red, yellow and green if blue is not used.

Extended data:

1. Connect the socket according to the specified color: the red and blue double-color wires penetrate into the socket bottom box. Red is the fire line, blue is the zero line, and the two-color line is the ground line. Thread according to the specified color, and the construction is also convenient. The red line is connected to the L pole of the socket, the blue zero line is connected to the N pole, and the two-color line is connected to the grounding sign.

2. Wiring diagram of lamp circuit with specified color: red is incoming line, blue is neutral line, and yellow is control line (green is also acceptable).

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