Does the bedside chandelier need to be connected to the power supply?

Lamps need to be connected to the power supply before they can be used normally.

There are two wires near the lamp: one is the control line from the switch, and the other is the zero line. Generally, the switch is also two wires, one is the control line leading to the lamp holder and the other is the live wire.

From the normal switch position, use three wires to connect to another control switch position.

The double-control switch and the other double-control switch are connected by two wires, and the third wire is the live wire at their respective positions, but it is actually three wires. Because all the fire lines are open, they can be used as the third line.