This product is a metal twisted pipe, coated on top with a layer of PVC insulation. Such a technical solution provides strength and flexibility of the structure in the transverse and axial directions. A metal hose in PVC insulation is widely used to protect electrical cables from mechanical damage and environmental influences. In addition, it minimizes the level of electrical noise produced.
PVC insulated steel sleeve is used in the installation of electrical networks to protect the cable
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Feature and Features
Using a metal hose, cables of various networks are laid:
- electrical wiring systems;
- communication lines;
- air conditioning systems;
- ventilation and heating.
You should be aware that the direct purpose of the flexible pipe in PVC insulation is not only to prevent damage to the electrical communications created by the increased external load. The presence of a protective polymer layer also provides fire safety in the event of a short circuit.
The following factors speak in favor of choosing a metal sleeve in a sheath of polyvinyl chloride compared to a simple product of this type:
- long service life due to the good corrosion resistance of the material;
- the ability to create a sealed cable wiring;
- the material copes well with the negative effects of the environment;
- increased level of water and dust resistance;
- high strength of the material does not allow rupture of the flexible pipeline.
Installation of the product is allowed at a temperature of -5 ≤ T ≤ +60 ºС. However, the metal hose in PVC insulation is able to work at lower temperatures - up to - 45 degrees. Another advantage of this product is compliance with the degree of protection of the shell from the ingress of liquids and mechanical foreign particles to the IP 65 index of the international Ingress Protection Rating system. The number “6” means that dust does not enter the device at all. And the number "5" indicates the impossibility of penetrating moisture, even if you water the metal hose with water jets from any direction.
There are models of sleeves with dust and moisture protection properties
The diameter of the flexible pipe in the PVC insulation ranges from 10 ≤ D ≤ 80 millimeters, and the length of the product is 10 ≤ L ≤ 50 meters. The metal component is made of galvanized steel strip. PVC sheath does not support combustion and has high fire resistance. The combination of these properties allows the use of such a metal hose for the installation of electrical networks where production facilities of enterprises require compliance with increased fire safety measures.
Alternative systems
Today, a wide variety of products are available that allow you to install the cable conveniently and quickly. To do this, use:
- plastic corrugation. Of the advantages, one can highlight the lightness and flexibility of the material.
Good to know! Corrugation can be used for both types of wiring - external and hidden. The disadvantage is its fragility. When exposed to mechanical stress, it may crack or break.
- perforated and simple cable channels. These products are intended for mounting only external wiring.A big plus of the cable channel is the presence of a removable cover. It will provide access to the wire when such a need arises. Manufacturers also took care of the aesthetic appeal of such products. Therefore, on the market today you can find cable channels not only in white, but also products in the color of wood. The fact that the material is inflexible is their minus, since installation is fraught with some difficulties
- metal trays of appropriate design and geometry. Most in demand in the field of industrial production, as they effectively prevent cable damage during significant mechanical stress.
Metal sleeves are available in different colors of the outer coating, so you can choose a shade that suits the color scheme of the room
The advantages of a metal hose in PVC insulation. How to choose
These issues were partially addressed above. But some points are subject to specification. For example, continuing the discussion about the incombustibility of these products, it should be noted that this property provides reliable protection for electrical communications laid even in structures prone to ignition and burning.
We already know that a metal hose in a PVC sheath is a flexible pipe. But, unlike pipes made of sheet metal, when this product is bent, its internal bore does not change. In addition, with such an impact, the appearance of microcracks in the metal component of the flexible pipe is excluded.
For installation, special special tools are not required, just a grinder or pipe cutter. Metal hoses are connected using brass fittings. By the way, with the use of special connecting elements it is possible to achieve an enclosure protection index of even IP 68, and not only IP 65. The number "8" says that during operation the metal hose can be immersed in PVC insulation for more than 30 minutes to a depth exceeding 1 meter. Shipment of these products from manufacturers' warehouses is carried out in bays: large diameter - 30 meters each, small - 50 meters each.
Choosing a flexible PVC insulated pipeline involves determining the internal cross-section sufficient to lay the cable.
Good to know! When performing this procedure, you must pay attention to the labeling of metal hoses.
The type and size of the sleeve is selected depending on the purpose of its installation, the thickness of the cables that will pass through it and other factors
Consider its structure on the example of a product of the type "MRPI R3-CPU ng 20" in PVC insulation.
The abbreviation MRI stands for flexible metal-polymer sleeve. The letter "P" is actually a sleeve. The following three corresponds to the type of product and in this case indicates 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" means that the flexible pipe is non-combustible. The number 20 is the diameter of this product in millimeters.
The installation of a metal hose in a sheath of polyvinyl chloride should be entrusted only to highly qualified specialists. Without professional skills in connecting the elements of a flexible pipeline, one cannot count on success here.
