How to connect the double control switch?

Generally, the switch panel bought back has the signs of L, L 1 L2. Remove the plastic skin of the thread ends with tools, and do not leave too much to prevent the thread ends from touching each other. First, connect the line at the L end with one end of L 1L2. After the switch is turned on, the other end is connected to L 1L2 and L. Take L 1L2 as the live wire of the left switch, and then connect the L point on the right to one side of the lamp and the other side to the zero line.

In a double-control switch, the live wire should be connected to the L connector of the switch, and the other switch L should be connected to the lamp wire. 2. Connect two switches L 1 and L 1 with wires to connect L2 and L2. Finally, connect the other end of the light bulb to the zero line.