Today, all the available switches and sockets of Fede, which exist a great many on sale, differ by the type of attachment to the wall. Selectless devices are highlighted, as well as screw devices. Let’s talk about this in more detail.
If we consider the base type, then in this case the wire should be attached using a screw. It is clamped with two layers of contacts. This method is good for aluminum wires, which often heat up, and over time change their shape. In this situation, the contact sparkles, but if you start twisting the screw, the situation returns to its circles. Naturally, copper wires can also be attached in this way. For this you will need terminals.
In addition to the above classification, switches are divided into devices for hidden and for open wiring. If the wiring is open, then the switches can be installed on a socket, the size of which is 70 millimeters in diameter, and the thickness is 10 millimeters. In the case of hidden wiring, the design itself is installed in boxes of plastic or metal, types of KP-1,2 and U-196, and then their size should be 69 millimeters in diameter, and the height is 40 millimeters.