How do I install the socket? There are four wires on the ceiling, two yellow wires, a green wire and a blue wire.

The line colors of these four lines do not meet the requirements, so it is impossible to distinguish them. However, two of these four lines are bright lines, one is live line and the other is zero line. The two yellow wires should be light wires, which are connected to the light switch. The green line and the blue line are the live line and the zero line of the power supply respectively.

Test live and zero wires with electric probes. One of the fire lines is the fire line and the other is the zero line.

Connect the ground wire after cleaning, connect the lamp wire to the switch, and connect the live wire and the zero wire to the left and right sides of the front of the power socket respectively. After installation, it should be left zero and right fire.

Attention must be paid to safety during identification and testing to avoid electric shock accidents. If you can't tell the difference between installation and non-installation, please ask an electrician for operation.