Tap-off box for home electrical wiring

What are the functions of the branch boxes? This question is quite easy to answer. When installing a switch, lamp, or outlet, every self-respecting electrician takes all measures to ensure that the junction box is as close as possible to the object of work. This is understandable, since it is possible to save the cable, and unnecessary work on laying the route will not have to be done, that's why there can be up to three pieces in each room.

However, their main purpose is not to save materials and working time, but the fact that they protect the cable veins from external sources, including moisture and dust, also prevents mechanical damage. Both in the first and in the second case, the consequences will be unpleasant, therefore installation of branch boxes is absolutely necessary. In each household, it is necessary to have these devices. In addition, the junction box is also needed as a subject of aesthetic perception, as it covers the unsightly ends of the cable, as well as the terminals or caps used in the wiring.

There are several types of junction boxes. Immediately it should be noted that these devices during construction and installation have been used for a long time, and during this time have undergone many changes. For use, the following boxes have appeared:

• Which are installed on hollow walls;
• Cable junction box;
• Square;
• Boxes for concealed and open wiring.
  

Let's consider some of them. Without a doubt, the "queen" is the junction box, which is used for outdoor wiring, which is a usual round glass made of a thin metal, covered with a lid on top. Since they are hermetic and do not give in to burning, the function assigned to them is fulfilled by one hundred percent. They can still be seen today in houses of ancient construction. Quite often, when there were no such boxes available, cans were used instead of them. Undoubtedly, such boxes are durable, they are used in modern construction, however, most often in industrial construction. But in spite of everything the given device remains metal, and it is rather expensive material, it is inexpedient to spend it on such a trifle as a box. To be honest, such a device is not always convenient, because if necessary, an additional hole for the input will be difficult, and if necessary, it is difficult to increase its diameter.

Therefore, with the development of such material as plastic, there appeared an junction box made of it, it is now becoming particularly popular. They are made of a durable material that does not support burning. This device is used when installing a hidden and open wiring.

It should be noted that the closure of junction boxes of all sorts of tiles, as well as blocking all kinds of structures is strictly prohibited. This can not be done on the basis of their accessibility considerations.