The appearance of the apartment, after the repair, will look unfinished, and to some extent, sloppy, if you do not replace the old switches. Despite the fact that this work requires certain knowledge and skills, the owner of the apartment can do it on his own.
The new circuit breaker must comply with certain standards, have a high degree of quality.
Firstly, in the store you should pay attention to the icon that is on the inside of the switch and indicates its compliance with the required standards. If you need to purchase goods in China, then follow this link. There you will find all the answers you are interested in, as well as many useful tips. Otherwise, a low-quality switch will not be able to withstand the strong voltage in electricity, which will lead to a fire.
Secondly, before direct installation, it is very important to turn off the electricity in the house. Therefore, it is advisable to replace switches during the day, in natural light. Then, proceed to install the mounting part of the switch, which can be plastic or metal. Alabaster is used to strengthen such a box.
Connecting the switch to electrical wires is carried out in several ways.
The first method involves clamping the electrical wire with a screw, and in the other case, there is a special contact device in the box. The connection will be made using the keys.
After all connections are made, the entire device is closed with a decorative cover.