This product is a twisted metal pipe, covered with a layer of polyvinyl chloride insulation. This technical solution provides strength and flexibility of the structure in the transverse and axial directions. The metal sleeve in PVC isolation is widely applied to protection of electric cables against mechanical damages and influence of environment. in addition, it minimizes the level of produced electrical interference.
Steel sleeve with polyvinyl chloride insulation is used in the installation of electrical networks to protect the cable
Characteristics and features
Cables of various networks are laid with the use of metal hoses:
- wiring systems;
- communication lines;
- air conditioning systems;
- ventilation and heating.
You should know, that the direct purpose of the flexible pipe in PVC insulation is not only to prevent damage to electrical communications, created by increased external load. The presence of a protective polymer layer also provides fire safety in the event of a short circuit.
The following factors testify in favor of the choice of a metal sleeve in a cover from polyvinylchloride in comparison with the simple device of similar type:
- long service life due to good corrosion resistance of the material;
- the possibility of creating a tight cable wiring;
- the material copes well with the negative effects of the environment;
- increased water and dust resistance;
- high strength of the material prevents rupture of the flexible pipe.
Installation of the product is allowed at a temperature of -5 ? T ? +60 ?WITH. However, the metal sleeve itself in PVC insulation is able to work at lower temperatures - up to - 45 degrees. Another advantage of this product is the compliance of the degree of protection of the shell from the penetration of liquid and mechanical foreign particles of the IP index 65 international system Ingress Protection Rating. The number "6" means, that dust does not get inside the device at all. And the number "5" indicates the impossibility of penetrating moisture, even if you water the metal sleeve with jets of water from any direction.
There are models of hoses with dust - and moisture-proof properties
The diameter of the flexible pipe in polyvinyl chloride insulation varies in the range 10 ? D ? 80 millimeters, and the length of the product - 10 ? L ? 50 meters. The metal component is made of galvanized steel strip. PVC shell does not support combustion and has high fire resistance. The combination of these properties allows you to use such a metal sleeve for the installation of electrical networks there, where the production facilities of enterprises require compliance with increased fire safety measures.
Alternative systems
Today a wide variety of products is available, allowing to carry out installation of a cable conveniently and quickly. They are used for this purpose:
- plastic corrugation. Among the advantages are the lightness and flexibility of the material.
Useful to know! You can use corrugation for both types of wiring - external and hidden. The disadvantage is its fragility. May be cracked or broken by mechanical impact.
- perforated and simple cable ducts. These products are intended for installation of external wiring only. A big advantage of the cable channel is the presence of a removable cover. It will provide access to the wire, when the need arises. Manufacturers have also taken care of the aesthetic appeal of such products. Therefore, not only white cable channels can be found on the market today, but also products in the color of wood. They, that the material is inflexible, is their disadvantage, as installation is associated with some difficulties
- metal trays of appropriate design and geometry. Most in demand in the field of industrial production, as effectively prevent damage to the cable under significant mechanical impact.
Metal sleeves are available in different colors of the outer coating, so you can choose a shade, which will suit the color scheme of the room
Advantages of metal sleeves in PVC insulation. How to choose
In part, these issues have been addressed above. But there are some points to be specified. Example, continuing the conversation about the non-flammability of these products should be noted, that this property provides reliable protection of electrical communications, laid even in structures prone to ignition and combustion.
We already know, the metal sleeve in a PVC cover is the flexible pipeline. But, unlike pipes, made of sheet metal, when this product bends, its internal cross section does not change. in addition, under such influence in the metal component of the flexible pipeline the appearance of microcracks is excluded.
No special tools are required for installation, enough Bulgarian or pipe cutter. Metal sleeves are connected with brass fittings. By the way, even the IP-68 protection index can be achieved with special fasteners, and not just IP 65. The number "8" says, that during work immersion of a metal sleeve in PVC isolation more than on 30 minutes to depth, exceeding 1 meter. Shipment of these products from the warehouses of manufacturers is carried out in bays: large diameter - for 30 meters, small - by 50 meters.
The choice of flexible PVC-insulated pipeline involves determining the internal cross section, sufficient for laying the cable.
Useful to know! When performing this procedure it is necessary to pay attention to the marking of metal hoses.
The type and size of the sleeve is selected depending on the purpose of its installation, cable thickness, which will take place in it and other factors
Consider its structure on the example of products such as "MRPI P3-CPU 20 ng "in PVC insulation.
The abbreviation MRPI stands for flexible metal-polymer sleeve. The letter "P" -actually the sleeve. The next three corresponds to the type of product and in this case indicates that, that it is leaky. "C" - a metal component made of steel, coated with zinc. The letter "P" indicates the presence of PVC insulation. The combination of the characters "ng" denotes, that the flexible pipe is non-combustible. Number 20 - the diameter of this product in millimeters.
Execution of works on installation of a metal sleeve in a cover from polyvinylchloride should be entrusted only to highly skilled experts. Without professional skills in connecting flexible pipe elements, you can't count on success here.