Junction box and its purpose

You probably will not find a man who did not know that such a junction box, but sometimes just need to refresh their knowledge. In this article, we will focus on the appointment of the junction box, as well as about the advantages and disadvantages of a complete renunciation of raspredkorobok in general.

What is the distribution box

Junction Box - a special container made of a fire-retardant plastic (or metal) serving to connect the wiring conductors and insulation obtained twists in order to improve the fire security.

After all, if you make enough high-quality twist, then heating will occur over time under stress, which can lead to melting of the insulation and to further short-circuit. A box will not allow the spread and damage the lights.

It should also be recalled that, depending on the type of your postings, you can use as an external junction boxes and concealed installation. And in the case of particularly aggressive environments, e.g., bathroom, there are boxes with a high degree of security.

Is it possible to give up the boxes?

Recently, more and more gaining popularity in general rejection of the junction boxes. The main argument in favor of this assertion is the fact that there are no twists - no risk of fire.

It is certainly true, but in this case for each point (socket or switch) you will need to run separate power cable to the electrical panel, and since quality cable should decently, then this harness will almost several times more expensive than the usual standard with distribution boxes. And for the laying of a bundle of cables, you will need to implement much more cutting grooves that just as expensive and time consuming.

And it is important to include if you do the wiring in the junction box by all the rules, then it will also be absolutely safe and will last for a long time.

Correct installation of junction boxes

In most cases, the boxes are mounted in the region of 10 to 30 cm from the ceiling (the distance depends on the height of the ceiling). And if you have a hidden type of wiring, then the box is mounted so that its cover is flush with the wall.

If we refer to the technical literature, in particular to PUE 7 edition, there can be found the following requirement: "To cover the junction box must be provided with easy access."

And if you have an external box that is then typically carried out a priori, and in the case of flush-mounted need to worry, that was saved access. This means that when finishing walls necessarily in this place, leave the hatch (window) to access.

Of course the aesthetic component can be affected in this case, but it is better to make a neat access than later to pick open most of the walls in search of the junction box. The more that modern boxes are performed not only in the classic colors, but can also be found the junction box of any color and style.

Methods for connection of wires in the junction box

Again referring to the SEP, you can find the item 2.1.21, which states that in the switch box The following methods are allowed wiring: crimping, welding, soldering or squeezing (bolt, screw, and etc.).

In this case, of course, to choose for you, but I would point out molding, welding and soldering, as the most efficient and reliable types of cable connections.

After wiring is formed you selected method, carefully isolate the bare ends (e.g., the heat-don) and carefully laid wires in the box.

Do not be amiss to check the quality of the wires (after all installation work) by load switching for a while. Then check that your lay not heated, if everything is in order safely close the junction box.

That's all I wanted to tell you about the switch box and wiring installation methods in it.

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