Double switches are very common in our lives. You may not necessarily know what a dual switch is. A dual switch is a circuit that guarantees that when any one of the switches changes state, it can switch the electrical and power connections in the middle between open and broken. Double switches are generally used for stairs (up or downstairs can control the switch of the middle light) and the bedroom can control the light switch at the door and the bedside. With the reduction of the use of sound and light control in the popularity of double switches in the stairwell, it is mainly used in the staircases of bedrooms and villas. Double switch is divided into single control and double control: Dual single control - two single switches combined to control two point lights; Dual dual control - mostly used for the control of one point light switch in two positions, or the control of two point light switches, often used in stairwells. Double switch wiring diagram Double switch principle The above is about the basics of the double switch. Everyone knows a lot about the knowledge of the switch circuit at home and helps to better supervise the construction of the electrician's master. More exciting recommendations: What is the proximity switch and proximity switch? Switching power supply module What kind of switching power supply module maintenance How to buy switch Siemens tell you four tips Small switch of the 7 functions of the switch socket Switch socket Entrance decoration Restaurant Decoration Switch Stair socket Electrical Bedside Villa Door Villa Picture Bedroom Lamp Cottage Guangzhou Jointair Co., Ltd. , https://www.jointair.cn
First, what is a double switch 
Second, double switch wiring diagram Through different terminal connections to achieve different results, there is a live wire and a neutral wire in the wiring diagram, and the function and connection of each terminal must be distinguished when wiring. There are generally two methods, one is the traditional safety connection, one of the double wires must be directly connected to the middle terminals of the two double switches, both switches are connected to the fire wire; the other is the provincial wire method, although It is possible to save wires but the safety hazards are very large and it is relatively easy to cause short circuits. 
Third, the dual switch wiring steps First connect the middle terminal of a dual-control switch to the live wire, and then connect the middle terminal of the other dual-control switch to the lamp cap (or the center tongue of the screw base), and then connect the return line, that is, use two green lines. Wires connect any of the two upper and lower terminals; the wire is directly connected to the other contact of the lamp (or the thread of the screw base). This completes the connection. 
What is the wiring diagram of the dual switch dual switch?
There is a kind of switching school called the double switch, you may not be familiar with this term, but you must have used it. Double switches can control the same power supply in different places. In order to better understand the double switch, we need to know what the wiring diagram looks like. Know how the double switch is connected. When the double switch circuit in the home encounters problems, it will be more convenient to solve the fault. If you are not sure about the above questions, this article will definitely help you.