Insulation is of great importance for ensuring high-quality operation of electrical equipment. Properly protected wiring is resistant to electromagnetic interference, negative temperature and mechanical influences. A universal means of providing such protection is a heat-resistant cambric, thanks to which it is possible to insulate the wires without reducing their main function.
Cambric device
This is a fairly simple device with which to isolate or seal open wiring. Cambric is a piece of elastic tube of small diameter. For example, if a connecting unit is provided in the wiring, then it is not necessary to perform complex insulation with a new coating in the form of a braid. It is enough to use heat-resistant cambric on the target site, using a simple technique of thermal installation. This device is also used at the end of the wiring when it is necessary to protect the edges from water or other negative influences.
Production material
Mostly silicone-coated fiberglass models are available for sealing. It is this combination of materials that provides insulation resistance to high temperatures and protects the wire from moisture. Glass fiber as such is an alloy of textured yarn that has undergone twill weaving. This material allows the heat-resistant silicone cambric to withstand chemical influences and aggressive environments with alkalis, acids and other solvents.
There are also specialized cambrices, which are made from cotton fabric impregnated with resins. For laying cables in rooms with a high level of humidity, tubes of cross-linked polyethylene and other polymer compositions are used.
For mechanical protection of cambric, additional insulation of the tube made of metal or carbon fibers can be used. It is a braid with an extension, due to which the position of the main insulation is stabilized relative to the wire.
Characteristics of heat resistant cambric
As electrical wires have different output formats, so cambric can be performed in different sizes. The inner diameter of the tube on average varies from 1 to 15 cm. The wall thickness is 0.2-0.3 cm. The protective and operational characteristics of heat-resistant cambric can be represented as follows:
- Dielectric strength - 7 kV.
- Operational temperature range - from -60 to 500 ° C.
- Mass - from 8 to 30 kg / km on average.
- The rated current of the protected conductor is 1000 V.
The dimensions of the product are determined by the intended purpose. The simplest models of cambric, which are produced in the form of pipe pieces, have a standard output format for solving typical problems. But there are universal devices that can stretch. If you plan to solder wires with an unpredictable length and thickness of the docking station, then it is advisable to use stretching cambrics. But in this case, there are limitations, not observing which it is possible to obtain a break in the fibers with a loss in performance. Also, depending on the modification, cambric can support the properties of dielectric, fire resistance and thermal conductivity.
Cambric application
The most common use of this device in electrics. When making twists, soldering, welding, installing terminals and terminals, the connection is mandatory insulated. However, this is not the only use of cambric. It is also used in additional insulation of mounting tools, screwdrivers, awls, and even in the design of fishing gear. For example, fiberglass heat-resistant cambric is quite suitable for fixing hooks and floats on the fishing line contour. And in each case, the marking function of the device is not excluded. Since the tubes are made in different colors, you can visually differentiate the lines of the same wiring. When fishing as part of a snap, multi-colored cambrices provide an attractive effect.
Cambric Benefits
Both universal heat-resistant and ordinary cambric have their own advantages. Of course, in the first case there are more of them, because, in addition to the convenience of installation and the durability of insulation, you can count on high resistance of the material when operating in aggressive environments. To this it is worth adding the preservation of the electrical properties of the protected cable. An improperly selected metal sheath creates a certain interference coefficient. In addition, fiberglass heat-resistant cambric due to the optimal combination of strength and elasticity allows the product to be used several times in different designs. Mounting operations with careful execution will minimize material wear.
As for the advantages of ordinary cambric, they come down to low cost and small size, which is a favorable factor in the insulation of thin wires.
Device mounting
First of all, insulation characteristics are determined, which, in principle, correspond to the operational parameters of the target circuit. For example, to protect the wiring of electric heating or electrothermal appliances, you will need a heat-resistant silicone cambrik V3, which has a dielectric strength in the range of 1500-4000 V. In ordinary insulated cables, you can limit yourself to simple tubes with a fixed diameter without special thermal protective qualities. The installation process itself is reduced to two operations:
- Install the handset. A cambric is planted on a damaged or docking open area.
- Tube shrinkage. Using a heating tool (building hair dryer, soldering iron), it is necessary to slightly heat the cambric material. With proper temperature conditions, it will instantly compress, providing a reliable tight grip.
Conclusion
Cambric is an indispensable consumable not only in the arsenal of electricians, but also in everyday life, since every home master periodically encounters repairing wiring - not only as part of appliances, but also in central communications. The key to successful use of cambric will be the right choice of model according to characteristics. Moreover, it is not at all necessary to strive to use the most expensive universal products with improved performance.
Under normal conditions, when repairing home wiring in the house, a standard heat-resistant cambric SV-13 with a thickness of 8 mm will be enough. It costs about 200-250 rubles, but at the same time it stably provides a basic level of protection - both from high temperatures (about 400 ° C) and from moisture. Also, do not forget about the functions of marking such insulation - the color with the appropriate signature on the cambric in the future will help determine what type of damage or connection will have to be dealt with in a particular area.