Classification of appliance industry report: appliance industry report is a switch with normally open and normally closed contacts. Double-control switches can be classified into single-link double-control, double-link double-control, triple-link double-control and quadruple-link double-control switches, etc.
The wiring steps for the engineering wall switch are as follows: Each connection of the double-control switch contains one normally open contact and one normally closed contact. Each connection has three terminals, namely the normally open terminal, the normally closed terminal and the common terminal.
From left to right, they are single-pole double-control switches, double-pole double-control switches and triple-pole double-control switches in sequence.
When identifying the terminals of a double-control switch, you can directly check the markings beside the terminals for identification. For example, the common terminal is generally represented by l, and the normally open and normally closed terminals are represented by L1/12. Some switches also use other indication methods. If it is impossible to identify each terminal from the markings, a multimeter can be used for detection.
It can be seen from the picture. No matter how the switch is switched, the resistance between the normally open and normally closed terminals is always the maximum, while the electrical limit between the common terminal and the normally open or normally closed terminal will vary between 0 and 00 as the switch is switched.
When testing a single-terminal dual-control switch, select the R×1Ω range with a multimeter, connect the red and black probes to any two terminals. If the measured resistance is oΩ, keep one probe still and connect the other probe to the third terminal. The measured resistance should be 00. Then switch the switch. If the resistance becomes oΩ, the remaining probe is connected to the common terminal. If the resistance is still 00, Then the terminal other than the current two test leads is the common terminal, and the normally open and normally closed terminals are usually not distinguished. A multi-terminal dual-control switch can be regarded as composed of multiple single-terminal dual-control switches. The connection terminals between each terminal switch are clearly distinguished. The method for detecting the three connection terminals of each terminal switch is the same as that for detecting a single-terminal dual-control switch.
Using two appliance industry Reports to control the wiring of a lamp from two locations. A typical application is to achieve the control of a lamp from two locations. It requires the use of two dual-control switches, and the wiring is as shown in the following figure:
This line can achieve turning on the lights at location A and turning them off at location B, or turning off the lights at location A and turning them on at location B.
The use of controlling one sardine from two places is very widespread. When used as A staircase light control, the switch on floor A is installed at the staircase entrance on the first floor, the switch on floor B is installed at the staircase entrance on the second floor, and the light is installed above the rest platform in the staircase (at the staircase turn). When used for controlling indoor hall lights, the A floor switch is installed at the main entrance, the B floor switch is installed in the indoor corridor, and the lights are installed in the hall. In this way, the hall lights can be turned on at the main entrance when entering and turned off when leaving the hall to rest in the bedroom. When used for controlling bedroom lights, the A floor switch is installed at the bedroom door, the B floor switch at the bedside, and the lights are installed in the bedroom. The lights can be turned on at the door when entering. Turn off the light at the bedside when you are resting.
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