Heat-resistant cable RKGM is used when installing electrical wiring in domestic and industrial conditions. The product is used at high temperatures created by electromagnetic induction in the circuit. It can be installed in rooms with high humidity (for example, baths and saunas). The multi-conductor cross-section makes it convenient to connect the wire to any terminals of electrical installations.
Content
- Wire use
- Cable properties
- Decoding of marking
- Features of the structure and operation
Wire use
The cable is suitable for laying high-power electrical lines in areas with temperate and hot climates. The installation electrical wire is manufactured in accordance with GOST 16039−1979 and belongs to the MSTP category, denoting a series of heat-resistant installation wires used for outdoor wiring.
In household and industrial electrical networks, machines are used that operate on the basis of the method of electromagnetic induction. Their switching connections to electrical circuits become hot due to the phenomenon's ability to create hot spots in nearby areas. The RCGM wire can withstand such drops and does not collapse.
Due to the wide range of production, the cross-sectional product can be selected for a specific situation. It is intended for outdoor and indoor installation. The cable is used:
- in housing construction - when distributing electricity in moisture-resistant rooms;
- in industrial premises - for connecting powerful units to the wiring line, making layers of winding;
- at chemical industrial facilities - in workshops with an aggressive environment.
Cable properties
The strength of the wire is provided by several layers of insulation and winding. Silicone rubber gives strength, so the cable can withstand pressure loads, breaks, and, if necessary, bends easily. The braid materials are not damaged by heating. Reduced or increased pressure of the surrounding space does not affect the functionality of the product, the technical characteristics of the wire remain at the required level.
Sheath materials are not subject to fire, therefore, they are considered fireproof. Fungi and mold do not grow on the surface of the wire, and moisture does not destroy the outer sheath. The saturation of protective layers with special chemical compounds allows to resist the penetration of moisture to the copper wire at the base of the cable. The possibility of connecting any electrical equipment is expanding without the danger of functional imbalance.
The technical characteristics of the RKGM cable do not allow its use in areas with average temperatures in the winter months below -15 ° C. The rubber coating does not withstand frost and cracks.
The products have the following technical qualities:
- AC rated mains voltage for wire use is up to 660 V;
- stranded core is made with a cross section of 0.75-120 mm;
- the bending indicator of the wire is within two diameters, the number of turns on the highway reaches ten without loss of functionality;
- the wire works at a heating temperature up to 180 ° C;
- the cable is guaranteed to last 8-10 years from the date of installation.
Decoding of marking
According to the current technical conditions, the wire is a single-core or multi-core product. In accordance with the classification presented in GOST 22 483−1977, its central copper strand was assigned IV flexibility class.
The standard regulates the cross-section of the core or the aggregate indicator of the areas of thin conductors that make up the base. For example, for a wire with a cross section of 1 mm², the maximum cross section of each wire should be 0.31 mm², but only if the core is made up of three conductors.
Certain letters are used in the designation of the RCGM cable. Their decoding shows the following:
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The first letter is sometimes A. It denotes the use of aluminum as the core material. If it is not there, then copper was used in the manufacture of the wire. Non-ferrous metal has a high electrical conductivity and does not oxidize. - The second letter P indicates the type of insulating material (rubber).
- The third letter, K, represents the characteristics of the rubber coating used for insulation. As part of the wire, silicone rubber is used, otherwise it is called silicone rubber. It is this type of insulation that gives the finished product its strength in difficult working conditions.
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The letter G means that the cable is flexible. According to the manufacturer's instructions, wires of at least class IV are classified as flexible class. - The last M indicates another braid in the cable construction, in which case a layer of glass fibers is used. To increase the protective characteristics, the layer is saturated with enamel and varnish.
- In some markings, a number is placed after the letters, which represents information about the cross-section of the cable.
Features of the structure and operation
The current-carrying conductor as part of the cable is protected by two non-metallic sheaths. Twisted wires in a common braid give the wire durability under extreme conditions. This design of the RCGM should not be confused with a multicore cable., in which each conductor is enclosed in insulation and is a separate independent element.
Single-wire products are more rigid, they are laid with fewer fasteners, the resistance of the wires at low frequencies is reduced. Stranded products allow the power line to be driven with turns, since the wire is more flexible. A cable with several twisted wires has a lower resistance when working at high frequencies due to the uniform distribution of the current density in the cross section.
Copper wires are coated with silicate rubber for improved performance. The outer layer of impregnated glass fibers makes the product resistant to chemical attack.
Silicon dioxide does not degrade at high temperatures. If the external insulation burns out during a fire, the remaining silicon oxide layer will act as a dielectric. The material has a melting limit at a temperature of +1710 ° C, has great rigidity and strength.
The coating of the wire, unlike the PVC sheath of other electrical cables, does not react to solar radiation. The thickness of the protective layer depends on the section of the product and is in the range of 0.6-2 mm. The fiberglass casing is impregnated with a composition of organic resins and glyphthalic varnish, which makes it possible to withstand heat up to 250 ° C and resist shock loads.
