Terminal blocks and their application

Terminal blocks are a necessary attribute in the field of electrification. Due to their variety, it is possible to flexibly adjust the electrical circuits, closing the windings, by virtue of their uselessness, and disconnecting unnecessary chains.

Terminal blocks are made of a dielectric housing and several mounting screws. In some cases, small metal slats are used (they make it convenient to fix the wire in hard-to-reach places).

The terminal blocks are an integral part of the supply during electrical installation and commissioning. On one side of the terminal board (in accordance with the rules of the PUE) it is allowed to "plant" no more than two wires of the same diameter. Otherwise, the contact will be bad, and the wires simply will not be obovzhimsya.

Terminal blocks are often referred to as screw clamps, terminal clamps, terminal clamps, terminal blocks or terminal blocks. All this - the names of the same attribute, and a specific name is formed, relying on the location of the terminal strip.

The product allows to connect single-core wires with stranded wires. Thus both wires should be fixed from different sides of the box, on different screws. As a rule, terminal blocks are carbolitic, however, this dielectric is quite fragile, so the carbolite was replaced by more reliable plastic analogs. Basically, products are used to install lighting equipment, household sockets, to connect the circuits of the power line terminal.

Today there are several types of terminals:

• Hinged;
• Designed for installation in a junction box ;
• Intended for installation of a circuit breaker.

In addition, terminal blocks are available with screw and spring clamps.
Materials for creating the product are also used different. Pads come in polyethylene and are used quite widely. Their feature is the low cost and separation of live parts with the help of physical impact (for example, with a knife). In the body of the shoe, there is a special hole for rigid attachment. Most often in polyethylene pads all current-carrying knots are made of brass, as this is a fairly good and inexpensive conductor.

Basically, this product is used to connect wires when installing lighting devices and installing junction boxes. In addition, the terminal blocks of polyethylene are suitable for the distribution of sockets for household appliances.

Modern terminals are often made of polyamide. This material is used in professional equipment, for example, in branded protection terminals or important control boxes for controlling high-voltage equipment.

Polyamide is used in such chains consciously, because these terminals are quite expensive, but of high quality. They are resistant to external influences, and are also resilient and characterized by high electrical resistance. Unfortunately, polyethylene analogs do not.

Polyamide is characterized by high breakdown voltage , huge resistance to wandering surface current, markedly extended temperature range, at which material can be used. In addition, self-extinguishing is inherent in polyamide terminals, since the material is practically non-combustible, and there are no halogen impurities in the composition.

Typically, polyamide pads are made with live parts of brass, which are covered with galvanic film.