The definition of "terminal boxes" is the most popular among professional electricians. However, the devices of this plan are often referred to as distribution and otvetvitelnymi. Regardless of the name, the essence of such means for performing wiring consists in organizing safe wiring nodal connections according to the developed scheme.

Connection boxes: main types, installation featuresDepending on the need for the implementation of certain tasks, the following boxes are identified:

  • For open wiring.
  • For internal wiring.

It is extremely easy to install terminal boxes for open wiring. In this case, the mounting tool is attached directly to the wall surface with screws. If necessary, the nodal connection of the conductors that are located in the thickness of the walls, it is enough to prepare a small opening where the housing of the distribution product is placed.

Application features

Thanks to the otvetvitelny devices it becomes possible to perform professional wiring, the organization of reliable wiring of conductors that feed electrical appliances and individual systems.

The terminal boxes contain a removable lid, which is easily and securely slammed upon completion of work. The enclosures of individual products in this category have marked holes for the wires, which are punched as necessary.

Regardless of the type, whether it is a box for internal or open wiring, secure fastening involves landing on dowels and screws. Fasteners for fixing the distribution device can be made of both metal and plastic. The latter option looks more preferable. Because plastic is corrosion resistant.

How rational is it to refuse the use of terminal boxes?

Is it possible to do without installing distribution products? Theoretically, yes. However, this will have to connect each zone of energy consumption with the distribution panel through separate wires. Such a decision will lead to significant costs for the purchase of funds for the implementation of electrical installation. In addition, in this case, deep gouging of surfaces will be required.

How much are the terminal boxes? The price of a standard universal plastic device starts from 10-15 rubles. Carbolite and ceramic products are somewhat more expensive. Significantly reduce the cost allows the purchase of electrical distribution boxes small wholesale.

As you can see, the reluctance to purchase the junction box leads to serious labor costs and causes even greater costs. Although there are still arguments against the use of gadgets. For example, some craftsmen consider laying individual wires as a method of strobing the walls in a safer way, since it prevents the connection of electrical conductors at numerous points throughout the house.

Without a doubt, such an opinion has the right to exist. However, the use of a correct, professional approach to installation work completely eliminates the likelihood of short circuits in the field of nodal connections and allows you to avoid cases of fire.

The installation process is not very different from fixing on the surfaces of the same floor. The difference lies in the need to create more voluminous holes in the ceiling.

The main requirement when installing terminal boxes is to maintain the required depth of the opening, at which the edges of the product will go flush with the wall surface. Based on this, it is advisable to engage in the installation of distribution tools only at the completion of plastering. Otherwise, to maintain the desired distance will be extremely difficult.

If you plan to cover the walls with a decorative layer, you need to ensure that the terminal blocks for the terminal boxes remain freely available, which may be required when servicing the line or performing repairs.

Deal with the installation of distribution devices can be the so-called fast method, which involves landing on cement or alabaster. For a start, the cable is put into special openings in the walls of the product. Then the wires are placed in the terminal blocks for the terminal boxes. In the absence of the latter, electrical conductors are connected in the middle of the body by twisting.

In conclusion, the planting hole in the wall is cleared of debris and dirt, filled with mortar. Then the box body is placed in the opening to the required depth. Irregularities are eliminated, after which it remains only to wait for the solution to solidify.

Wires in the terminal box are switched off elementary. The conductors are connected in parallel according to the colors of the insulation, the shades of which are identical regardless of the manufacturer of electrical installation products.


The terminal box is an effective tool for quickly organizing reliable electrical conductor assemblies. Placing the connections in the middle of the distribution device protects the occupants from accidental electric shock and fire situations, which cannot be said of the surface installation of the wires using the twisting method.