Junction box

Why do I need a junction box? A question that is worth considering.

A junction box is an electrical device for hiding cable twists and divorces when laying an electrical network.

Boxes are made of non-flammable plastics and covered with a lid. At the ends there are necks for inputting wires.

There are two types of electrical distribution boxes. For open and concealed wiring.

Mounting the open wiring, the distribution box is placed over the wall, and for concealed wiring - mounted in the wall and fixed there with plaster mixtures.

The box is mounted in the wall so that the lid is on the outside. Having opened it, the expert in repair receives access to the wires.

To ensure the reliability and uniformity of the distribution of electrical energy in the room, the wiring is divided into a trunk. Each room has its own, and each main has its own supply wire. Switches, chandeliers, sockets and other electrotechnical devices are connected to this wire.

The electrical distribution box is designed to supply wires to one point and connect them together.

The installation of boxes is made in the punched holes of panels and walls, or on their surface with the help of self-tapping screws.

The junction box should not disfigure the design of the room, for this, it is covered with wallpaper or hidden under a layer of putty.

The union of the cable in the box is made by soldering or twisting, after which they are sealed with a special tape.

According to the existing rules, electrical wires must be connected only in a special electrical device called a junction box.

The installation distribution box is installed a few dozen centimeters from the ceiling, and the location is chosen depending on the ceiling height of the room.

To properly connect the wires in the box, you need to align the ends of the wires to a length of up to 2-3 centimeters. Further, the outer insulation of the cable is removed (if the cable is double insulated) and live wires are released. If the cables are switched by twisting, followed by soldering or welding, the stripping length will vary from 4 to 5 centimeters.

The next stage is a "ringing" of wires. For this purpose, you can use any tool with a "dullness" indication.

To cope with the installation of wiring, one must imagine that the wires are pipes, and the current passing through them is water. A phase wire is a wire through which water flows. A null conductor is a "reverse". A protective wire is a "safety alert" in case there is a leak of "water" somewhere. Such a leak instantly "merges" into the ground.

Different coloring of wires simplifies the work. Usually white is the phase wire. Blue is the "zero" wire. Green-yellow is the ground wire.

When conducting electrical installation activities, it is necessary to strictly follow the order of the colors of the conductors. This greatly facilitates the installation in the junction box.