Over a hundred years ago, with the introduction of thethe life of electricity, humanity has finally adopted the technogenic direction of our civilization. Now we are surrounded by various electrical appliances and equipment. Almost every house has electric wires, and if housing is in hard-to-reach areas, then people find a way out of the situation: install wind generators, solar panels and so on. But not all people know that almost any electrical appliance needs such an element as a terminal box. What is it and what is it for? In this article we will try to answer these questions.
The terminal box is rectangularor a round box with a terminal block inside. Typically, the shoe is designed for a maximum cross-section of a commutated wire (35 mm) and for the number of direct connections - 7-12 pcs.
The terminal box, depending on the purpose, can be:
Classification of terminal boxes
1. The installation method is:
2. Depending on the materials used:
3. By degree of protection (dust, moisture, etc.):
4. Divided according to climatic performance:
5. Depending on the form of performance are:
6. By the presence of terminal blocks:
We should also mention the instrument boxes.They are slightly larger in size than terminal boxes. Allowed to place in themselves, apart from pads, small-sized appliances, switches, sockets.
The terminal box can have in its housingHermetic glands for the supply of wires and cables. Omentums are often replaced by metal or plastic pipes. Seals can be rubber with cut concentric circles or plastic, allowing you to adjust the mounting hole. The use of oil seals can significantly increase the leaktightness of the product. The box is closed with a lid, which is fixed to the body with screws or snaps with gaskets.
All terminal boxes, depending on the destination,applications and designs have different markings. This allows the consumer to quickly select the desired product. After all, the terminal junction box can be used both under water and at a height (say, five thousand meters above sea level), can be sewn in the wall, and can be constantly exposed to aggressive influences in the chemical industry. All this information is contained in the product code. For example, the explosion-proof terminal box is marked with 1ExeIIT5. There are many types of markings, even among explosion-proof boxes. In the labeling, information is also encrypted about the degree of explosion protection, and the place of application of the product, and much more.
