The level of strength and reliability of cable connections is largely dependent on the elements used. Their quality fully affects the operation of the entire communication line. The coupling for the cable stands out significantly from the rest of the assortment. This is a special design, widely used for high-quality insulation of cable systems and all joints. In addition, such parts connect the individual parts of the wires. They guarantee a high level of protection against water, tightness of fastening, resistance to corrosion and other possible malfunctions.
Coupling for cable is made of different materials. There are truly a huge number of them. These are plastic, lead, heat-shrinkable, cast-iron and other products. Also, depending on the installation, the couplings are both internal and external.
What are couplings?
In order to answer this question, we consider this construction in more detail. For example, a coupler for cable 240 is needed to connect the two ends of the wire on the same line. Allowable voltage in which should not exceed 10 kV. If the cables are of different cross-sections, then you need to use adapters. Such a coupling has a bolted method of attachment, which allows for the highest quality connection. It is suitable for use in various places: in the ground, tunnel, on overpasses, etc.
Coupling for cable: purpose
Any cable trunk, regardless of its functional purpose, is exposed to many negative factors. These include chemicals, moisture, etc. The most effective way to protect such systems from all kinds of internal and external negative influences is through high-quality cable insulation, especially at the junction points. Many domestic companies produce heat-shrinkable couplings with the possibility of operation in the temperature range from -50 ° C to + 50 ° C.
Both the insulating sheath and the heat-shrinkable sleeves are made from high quality polymer. The physico-mechanical properties of this material made it possible to overshadow all past developments.
Heat Shrinkable Cable Glands
Currently, the most common product is a heat-shrinkable sleeve for cable. Such a demand is easily explained: the product is reliable, installed without any difficulties, the use does not entail harmful consequences. A distinctive feature of this type of coupling is the ability to connect several cables at once, however, provided that the diameter of their cross section is almost the same. After they went into widespread production, almost all enterprises try to abandon other types, since when installing this particular sleeve, the cable does not lose elasticity, and the connection is quite reliable and completely protected from unwanted external influences.
Couplings Advantages
The following advantages are characteristic of thermoseated couplings:
- ease of installation, due to which this procedure can be performed by a person without specialized skills and knowledge;
- such a cable connector is universal;
- long term of operation;
- completely safe for others;
- absolute conductivity of electricity;
- good resistance to aggressive chemicals;
- biological neutrality;
- high strength and tightness of cable connections.
Application and features of the production of couplings
The main feature of heat-shrinkable sleeves is the ability to change the size when heated and adapt as easily as possible to any cable size, and any deformation of the product is completely eliminated here.
A modern heat-shrinkable coupling for a communication cable is made using a special technology called cross-linking of shape memory and polymers. Chemical bonds are formed between the molecules in the polymer chain. Due to gamma radiation, high-frequency electron irradiation, silane or pyroxide methods, linear chain molecules bind to each other in a durable and high-quality structure. As a result, the technical and physical properties of heat-shrinkable sleeves are fully fixed and thereby impede the heating of products above the melting temperature. They ultimately achieve the necessary consistency and finally harden, acquiring the necessary shape.