Corrugation for electrical wiring underground. Laying cables in the ground in plastic pipes. Criteria for choosing plastic pipes? Special corrugation is important

Plastic pipes are used today both by professional installers and in everyday life on the most different stages construction or renovation work. In sewerage systems, hot and cold water supply, heating, there is a steady trend to use plastic pipes instead of cast iron or metal.

Corrugated PVC pipes production Russian company"Promrukav" are intended for wide use in a single laying: in domestic electrical installations inside or outside the premises. For computer, telephone, television, electrical networks in the case of their construction with insulated wires and non-combustible cables. The maximum allowable voltage is 1000V. Made from PVC compound high class. Thanks to the use of corrugated pipes, the time for installing the electrical network is significantly reduced.

The corrugations are stiffening ribs and therefore provide protection to the wires, excluding any mechanical impact. If you mount cables along the walls, you will provide yourself with easy access to cables, repair, replacement at any convenient time. This is much easier than arranging wiring deep in the wall.

Corrugated HDPE (polyethylene low pressure, material) pipes also designed for single laying of non-combustible materials. They are uniform along all lengths, do not form cracks. Outperforms PVC pipes in terms of wear resistance.

orange corrugated pipes HDPE halogen free they are made of HDPE with the use of special additives to reduce the combustibility of the material. The abbreviation NG in the name means "non-combustible".

smooth hard pvc pipes used in open wiring - along walls and ceilings. The format is three meters long. For solutions in corners and ledges, fasteners and other accessories that are convenient and easy to use should be used. Pipes have a high degree of protection IP65, prevent the penetration of moisture, protect against mechanical damage.

Smooth HDPE pipes provide additional insulation of networks and protect against mechanical damage. They are durable - the service life is over 50 years. Resistant to temperature extremes, withstand severe frosts.

Plastic pipes allow you to collect all the cables in one place and provide equal access to each of them.

When reconstructing wiring or installing a new one, it is recommended to “pack” it in a protective sheath. Most often, corrugated electrical pipes are used, which are usually called "corrugations for cables and wires." It is a round hose with a ribbed surface. Due to the ribbing, its flexibility is significantly increased.

Why do you need a corrugation

In general, from mechanical destruction of the corrugation, even metal, - not best protection. One can only hope that, having felt that the drill has failed, it will be possible to stop in time. And in order not to get into the electrical wiring, it is better to have an exact plan for laying it with measurements and binding to the corners. After all, not everyone determines the cable in the corrugation, even under load. So do not forget before pouring the screed, before finishing, take pictures, sketch the distances.

Types of corrugations for laying cables

The corrugation for the cable is different in strength:

As you can see classification is in progress by strength properties, which determines the area of ​​​​use.

Varieties

In addition to all this, there is also a corrugation with and without broach. A broach is a thin cable or wire that facilitates pulling the cable into the corrugation. The cable is tied to the end of the cable, pulled by its other end, tucking the cable inward. It is problematic to cope with this task without a broach - with sufficient rigidity, you can simply put a few meters of cable inside, but if the route is long, it will be too difficult.

Cable corrugation can be with a broach ( correct name"probe") and without

If we talk about the types of plastic corrugations, it should be mentioned that there is a two-layer corrugation. Outside, it has the same ribbed surface, but inside it is smooth. Corrugation for this type of cable is expensive, but if necessary, you can really stretch a new cable into it. In those types where the inner wall is ribbed, this is far from always possible - if the track has a minimum of turns, and even those along a wide radius.

Metal corrugation for cables is also different. It is made from galvanized or of stainless steel. In addition, there is a metal corrugation with a polymer coating. She has best performance protection against dust and moisture ingress. Such a protective shell is also called metal-polymer.

What materials

Corrugation for cable and electrical wires is made of plastic and metal. The materials used are different, with different characteristics. They must be selected based on the tasks that they must perform.

When it comes to compliance fire safety when installing the gasket in combustible walls, perfect option — metal pipe. It saves from the loads that may arise when changing the size of the building. Rodents cannot cope with it either. Also this the best option from the point of view of fire safety: even in the event of short-circuit currents and failure, the probability of burning a pipe with a wall thickness of 2 mm is very small. So the fire won't start. If the laying of electrical cables in pipes does not appeal to you at all, then you can use metal or stainless steel or galvanized corrugations.

Corrugation for cable, dimensions, prices

Corrugated pipes for electrical networks are available in sizes from 16 mm to 65 mm. When choosing a size, it should be borne in mind that these products have two diameters - outer and inner. If you are going to lay several conductors - wires or cables - the diameter must be selected so that there is a gap of at least half the radius. This requirement is based on the fact that during group laying (it is necessary, by the way, to take a special cable), it will heat up more and the presence of an air gap will contribute to the best challenge heat.

Size selection

The choice of corrugation diameter also depends on the area where it will be laid:

The diameter of the corrugation for laying the cable is selected depending on the number and cross section of the wires. Data for copper conductors are given in the table.

This information is for reference, but you can navigate it. You can take a larger, but not a smaller diameter.

Prices

Generally speaking, the cheapest is corrugation for PVC cable, in the middle range - PP and HDPE, the most expensive of all is metal corrugation. Moreover, the option with broach is slightly more expensive than without it. When buying, you need to pay attention to the same wall thickness, to the uniformity of color.

Corrugation for cable is sold in coils of 50 and 100 meters, less often it can be found in meters, but then the price is slightly higher. In general, the price depends not only on the material, but also on the wall thickness. The cheapest is light PVC corrugation for cable, but sometimes it looks more like just a film. From what it can protect, it is difficult to say. If you are concerned about quality, it is better to purchase everything related to electrics not in construction supermarkets such as Leroy, etc. and in specialized ones. The quality there is usually better, and the prices, if higher, are justified. In order for you to have an idea about the possible spread of prices, in the table we will summarize several types of corrugations with a brief technical description.

Installation of corrugated pipes

For outdoor (open) installation, special plastic clips are used to fasten the corrugations for cables and wires, which are selected according to the outer diameter of the pipe. Clips are fixed after 20-30 cm on self-tapping screws or dowels - depending on the type of wall. A corrugation for the kbale is inserted into the installed clips, pressed until it clicks. When mounted in a strobe, it is fixed with plastic ties or dowel-ties. You can also use homemade fasteners - tin strips with nails or screws in the middle.

When developing a route, the following recommendations should be taken into account. They proceed from the fact that the route should be without sharp turns - in order, if necessary, to tighten a new piece of cable. Because:

These rules relate to the development of a route for ground (suspension) and including. If the route is long, and you want to be able to pull the cable “in case of emergency” without replacing the corrugations, develop the route with these rules in mind.

Installation of wiring in the corrugation

When installing wiring in a house or apartment, pieces of corrugation are fixed between junction boxes, from them - to switches / sockets, to lighting fixtures. Here the sections are usually small, straight, with a maximum of one or two turns. So there are no problems with tightening the cable.

If several conductors are needed to be tightened into the corrugation for the cable, they are folded, fastened along the entire length with adhesive tape or electrical tape in increments of 30-50 cm (depending on stiffness). Rigid insulation is stripped from one edge by 10-15 cm, the wires are twisted into a common bundle, a loop is formed from it (secure the loop with tape or electrical tape, too). If the tourniquet turns out to be too thick, you can form loops separately, just stretch the twine through everything. A cable is tied to this loop, and then they begin to pull it from the opposite side, pulling the sheath over the cables. At the same time, it is necessary to pull without jerking, smoothly - so as not to damage the cable or cable.

When installing, be careful not to slip the broach. To be sure, you can secure the cable with a piece of tape. There are two installation approaches:

• First fix the corrugation, then tighten the cable or wires into the finished piece.
• First stretch the cable, then mount it.

The first method is good when installing internal wiring, where the distances are small - from the box to the box, from the box to the outlet, etc. The second method is more suitable for installation of long sections.

Features of open laying on the street

When laying wiring on the street, it is usually suspended on a cable. For outdoor use, metal stainless steel is suitable, and better - metal-polymer corrugation for cable, as well as plastic polyamide (black or blue). All these materials are UV resistant and remain flexible at sub-zero temperatures.

During installation, the cable stretched into the corrugation is suspended on a cable. The cheapest mount is ordinary plastic ties. There are also special hangers.

Plastic pipes are used today both by professional installers and in everyday life at various stages of construction or repair work. In sewerage systems, hot and cold water supply, heating, there is a steady trend towards the use of plastic pipes instead of cast iron or metal ones.

Corrugated PVC pipes produced by the Russian company "Promrukav" are intended for wide use in a single laying: in domestic electrical installations inside or outside the premises. For the operation of computer, telephone, television, electrical networks in the case of their construction with insulated wires and non-combustible cables. The maximum allowable voltage is 1000V. Manufactured from high quality PVC. Thanks to the use of corrugated pipes, the time for installing the electrical network is significantly reduced.

The corrugations are stiffening ribs and therefore provide protection to the wires, excluding any mechanical impact. If you mount cables along the walls, you will provide yourself with easy access to cables, repair, replacement at any convenient time. This is much easier than arranging wiring deep in the wall.

Corrugated HDPE (low pressure polyethylene material) pipes also designed for single laying of non-combustible materials. They are uniform along all lengths, do not form cracks. Outperforms PVC pipes in terms of wear resistance.

Orange corrugated pipes HDPE halogen-free they are made of HDPE with the use of special additives to reduce the combustibility of the material. The abbreviation NG in the name means "non-combustible".

Smooth Rigid PVC Pipes used in open wiring - along walls and ceilings. The format is three meters long. For solutions in corners and ledges, fasteners and other accessories that are convenient and easy to use should be used. Pipes have a high degree of protection IP65, prevent the penetration of moisture, protect against mechanical damage.

Smooth HDPE pipes provide additional insulation of networks and protect against mechanical damage. They are durable - the service life is over 50 years. Resistant to temperature extremes, withstand severe frosts.

Plastic pipes allow you to collect all the cables in one place and provide equal access to each of them.

When installing communication networks, HDPE pipe for cable is widely used as a protective case. It is also used when laying power lines. The HDPE pipe reliably protects the cable from the influence of stray currents, mechanical damage and the aggressive effects of the soil. Laying technology is determined by the purpose engineering networks and their location.

HDPE pipes for cable laying

The use of HDPE pipes for the installation of communications

For laying power lines and other engineering communications various HDPE pipes are used. They differ technical parameters and design features:

1. When installing electrical wiring in a floor screed or brick wall applied smooth pipe HDPE black.
2. Products with a corrugated surface are used for laying open, semi-hidden and hidden ways of electrical, telephone, television and computer networks operating under electrical voltage variable or direct current, the value of which does not exceed 1000 V. An electrical installation of this type can operate both on outdoors, as well as indoors.
3. For laying in the ground, HDPE corrugated pipes are used, which are characterized by increased elasticity and strength, the ability to restore their linear dimensions and ease of installation.

Depending on the design, the products are available with or without a probe. It is a special device that is designed to pull the cable inside the pipe. This reduces the time for laying power networks and communications.

In the absence of a probe, the cable is drawn using a reusable device. The complexity of the operation is somewhat increased, in addition, certain technical support is required. However, a HDPE pipe for laying a cable without pulling can be used repeatedly. This possibility is relevant for private repairs of communications.

Pipe for cable laying corrugated with probe

Among manufacturers of HDPE pipes for laying electrical cables, DKS products are most in demand. It is represented by corrugated products "Octopus", designed for installation of hidden wiring indoors. Expanded with accessories and various types boxes that ensure the laying of communications in strict accordance with established standards.

DKS company products: HDPE pipe "Octopus"

To protect the power and signal cables, a series of double-walled pipes "Octopus" is used. They reliably protect electrical wires from damage as a result of mechanical influences and influences. environment. The tightness of the plastic prevents the penetration of moisture even when laying the cable in the ground.

Advantages of HDPE pipes

Compared to HDPE metal protective cases, a cable pipe is much cheaper. Moreover, it is not necessary to use products that are produced in accordance with the requirements of GOST for laying power lines and various communications - it is allowed to use products from recycled materials. technical pipe HDPE is made from production waste, which is mixed with various polyethylene additives. This slightly changes the performance and color finished products, but allows you to significantly reduce costs and reduce its cost.

In addition, HDPE cable pipes have the following advantages:

• the service life under normal conditions is up to 50 years;
• individual sections can be connected without the use of a welding machine;
• have a small weight compared to metal protective cases;
• do not require grounding, as they have good electrical insulating properties;
• are not subject to destruction under the influence of an aggressive environment and corrosion;
• retain their settings even in difficult conditions operation and can withstand a temperature difference in the range from -25 ⁰C to +70 ⁰C;
• do not emit toxic substances and do not accumulate condensate on the surface.

The cable in the HDPE pipe can be laid along any curved path without the use of connecting elements because the polymer is bendable. Particularly easy to change the configuration of products of small diameter.

However, HDPE pipes should not be bent too much: this can provoke a hall and it will not be possible to stretch the cable.

Methods for laying an electrical cable

The technical features of laying HDPE pipes depend on the location of the cable and its operating conditions. This also affects the list of equipment used and the necessary components.

Installation in enclosing structures

Indoors electrical wiring using HDPE pipes, it is laid as follows:

1. outline the location of the cable;
2. fix the pipe, and it can be attached to the floor with metal brackets, and to the ceiling or walls - with special holders with a latch;
3. pull the cable so that it is located freely, without tension;
4. construction on the floor is poured concrete screed, and in the wall or ceiling they are sealed with plaster or other materials, depending on the diameter of the protective case.

Cable laying using HDPE pipes on the floor

HDPE pipe allows:

• reduce the length of the wiring;
• realize repair work and cable hauling without damaging the surface of ceilings and walls.

When installing communications indoors, it is possible to use various connecting parts to fix individual sections protective cover: bends, couplings and other components. However, corrugated elements are most often in demand for turns at the points where the pipe enters the floor slab or the transition from the floor to the wall. In this case, the HDPE pipe for electrical wiring must be bent at an angle of 90⁰, and this is impossible without crushing and deforming the material.

According to current regulations for installation concealed wiring, which is located inside floors or walls made of non-combustible materials, it is allowed to use smooth or corrugated HDPE pipes.

Laying in the ground with digging a trench

This technology is in demand when laying communications on summer cottages. Before starting work, you should inspect the cable and check the integrity of the sheath. If it is damaged, the protective function of HDPE pipes will be useless.

Then, during the laying process, the following operations are performed:

1. make markings and dig a trench of the required depth;
2. a HDPE pipe is placed in it with or without a broach of the desired diameter;
3. pull the cable and lay it in such a way that it is located without tension;
4. the pipe is first covered with a layer of sand 10 cm thick, and then with soil by about 15 cm.

To quickly locate the cable, you can lay a special signal tape over it.

Cable laying using HDPE pipes in the ground

When using HDPE pipes for laying power networks in the ground, it is desirable to exclude the use of couplings and other connecting elements, since this makes it difficult to ensure sealing. However, when the cable is brought into the building, fittings are simply necessary.

For laying the cable in a straight section, use solid pieces with a cross section of at least 4 mm. If the section is too long, then an elastic metal wire or a special nylon broach should be used to tighten the electrical wiring. They are first launched into the pipe, and then the tied cable is tightened.

Trenchless laying

For laying the electrical cable, which is located in hard-to-reach places using trenchless technology. Most often, it is in demand by public utilities, as it is carried out with the involvement of complex equipment and special equipment.

The essence of the method lies in horizontal directional drilling, which allows you to lay underground communications without disturbing the surface layer of the soil. First, they study the composition of the soil and obtain permission to carry out earthworks. Then the cable is laid in the HDPE pipe, which includes the following steps:

1. Drilling a pilot well. The puncture of the soil is carried out using a drill head, which has a bevel in the front and built-in radiation. When it enters the ground through special holes, a solution is supplied that fills the well. It reduces the risk of collapse and cools the heated tool.
2. Well expansion. It is performed by a rimmer that replaces the drill head.
3. Laying HDPE pipes with cable inside. They are pulled into the well using a drilling rig.

Cable laying by horizontal drilling

The main disadvantage of horizontal directional drilling of soil is the complexity of its implementation, therefore, for such work, they conclude an agreement with an organization that specializes in such activities and has the necessary equipment.

Horizontal drilling rig

Laying a cable using HDPE pipes allows you to provide reliable protection for a long period of time, you just need to follow the technology for installing power lines and other communications.

When laying an electrical cable, you should definitely think about its protection. Protection is required for outdoor communications, for electrical wiring inside the building, for cable running underground. In the latter case best solution there will be the use of hollow pipes made of low-pressure polyethylene (hereinafter - HDPE).

HDPE pipes are produced in the factory by extrusion. The standard pipe consists of homogeneous plastic with smooth surface. The color of the product is black. From mandatory requirements to HDPE pipes allocate the following:

• The pipe material is a dielectric (does not require grounding).
• The product has good durability.
• It is resistant to the destructive effects of many chemical compounds.

The production technology of HDPE pipes is regulated by GOST 16338 and 16337. The standards describe in detail appearance products - without blisters, cracks, sagging and other defects. The pipe cannot delaminate, while its inner surface should be as smooth as possible. More a budget option- pipes made from recycled materials (a mixture of production waste and polyethylene additives). Such strict requirements are not imposed on their production technology, however, the service life of such products will be much less.

Other performance features:

• The working pressure indicator is determined by the type of pipe and can be from 0.25 MPa for light varieties to 1 MPa for heavy ones.
• The service life is about 50 years, under normal operating conditions.
• Temperature range from -25 to 70°С.
• HDPE pipes are environmentally friendly, do not emit harmful substances.
• Pipes can be easily bent without loss of performance.
• They have high elasticity, are able to restore the linear size.
• Products are lightweight, especially in comparison with metal counterparts.

It is important! The HDPE pipe must not be bent too much. This can lead to the formation of kinks, pulling the cable through which will be very problematic.

The use of HDPE for laying cables in the ground

The laying of electrical communications underground is justified primarily in regions with frequent manifestations of adverse weather conditions: strong gusts of wind, lightning discharges, etc. In the cold season, underground laying will help protect the cable from icing and possible gusts.