What are the functions of branch boxes? The answer to this question is quite simple. When installing a switch, lamp or outlet, every self-respecting electrician takes all measures so that the junction box is as close as possible to the object of work. This is understandable, since you can save the cable, and you won’t have to do extra work on laying the route, which is why there can be up to three such devices in each room.
However, their main purpose is not to save materials and working time, but to protect cable cores from external sources, including moisture and dust, and mechanical damage is excluded.
Both in the first and second casesthe consequences will be unpleasant, so the installation of junction boxes is a must. Each household must have these devices. In addition, the junction box is also needed as an object of aesthetic perception, since it closes the unsightly ends of the cable, as well as terminal blocks or caps used in electrical wiring.
There are several types of junction boxes. It should immediately be noted that these devices have been used in construction and installation for a long time, and during this time they have undergone many changes. The following boxes appeared for use:
- which are installed on hollow walls;
- cable junction box;
- square;
-
boxes for concealed and exposed wiring.
junction box
Let's look at some of them. Without a doubt, the "queen" is the junction box, which is used for outdoor wiring, which is an ordinary round glass made of thin metal, covered with a lid on top. Since they are hermetic and non-combustible, the function assigned to them is performed one hundred percent. They can still be seen today in the houses of an old building. Quite often, when there were no such boxes available, tin cans were used instead. Undoubtedly, such boxes are durable, they are used in modern construction, however, most often in industrial construction. But in spite of everything, this device remains metal, andthis is a rather expensive material, it is not advisable to spend it on such a trifle as a box. To be honest, such a device is not always convenient, because if necessary, it will be difficult to make an additional hole for input, and also, if necessary, it is difficult to increase its diameter.
Therefore, with the development of such a material as plastic, a junction box made from it appeared, it is now becoming especially popular. They are made of durable material that does not support combustion. Such a device is used when installing hidden and open wiring.
It should be noted that it is strictly forbidden to close the junction boxes with any kind of tiles, as well as to block with all kinds of structures. This cannot be done for reasons of accessibility.
