HDPE for underground cable laying. Why do you need a pipe for laying cables in the ground, technical specifications

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Underground routes of electrical cables and communication lines are subject to various threats - flooding, mechanical destruction due to soil movements or pressure on the soil surface, and the effects of stray currents. Although most cables are covered with strong layers of insulation and braiding, additional protection is necessary. In recent decades, HDPE pipes for cables have been used for this purpose, which you can purchase with delivery to Moscow by placing an order on the website or by phone.

Types of HDPE pipes for cable

From the entire range pipe products Almost all articles can be used for cable laying. But two types most meet the requirements - technical and electrical pipes. The first are smooth-walled black products, which are successfully used for non-pressure pipelines cold water. In the case of electrical installation, a HDPE technical pipe for laying cables is used if the lines run in a concrete screed or brick wall. They are also very convenient for installing underground lines using the puncture method (HDD). In this case, the pipe is pulled into an inclined or horizontal well along with a cable installed in it. The technology is quite complex and requires special equipment and highly qualified personnel. Smooth-walled rigid HDPE pipe with low SDR (up to 9) is ideal for laying cables at great depths - it can withstand significant soil pressure and protects the cable from possible breaks.

Special pipes for electrical purposes

In most cases, for underground and surface installation of highways, an electrical HDPE pipe is used for cable laying. It is two-layer - smooth inner (LDPE) and corrugated outer (HDPE). The internal one provides minimal resistance to cable pulling. For this, a special steel or polypropylene cable is used - a probe. Standard HDPE cable pipe can be supplied with or without a probe installed inside. HDPE pipe is produced electrical purposes according to GOST 16338 (markings 277, 276, 286, 273 and 271) or GOST 16337 you can recognize them by other markings, for example 0803-020. According to the standard, the product is divided into several types: heavy and light corrugated; double-walled; heavy smooth; halogen-free. They differ, first of all, in their ability to withstand external pressure, which determines the possibility of installation at different depths. Light ones are designed for a pressure of no more than 0.25 MPa, medium ones - 0.4 - 0.6 MPa, heavy ones - up to 1 MPa. When ordering non-standard products, the permissible maximum pressure is also selected. The weight of the pipe and its strength directly depend on the SDR indicator. For cable lines, products with SDR from 7.4 to 26 are used, depending on the operating conditions of the future line and the pulling method. For the HDD method, you can only take products with a ratio of 7.4 – 11. Also shells for various purposes differ in color: red - for high-voltage lines; blue - communications and telecommunications; black - general purpose.

Smooth HDPE pipes for cables

Smooth HDPE pipes for cables are black, they are produced with a single-layer wall and are not reinforced. Some types of two-layer ones are reinforced and are designed for use in difficult conditions. The Promtekhkomplekt company offers a full range of electrical and water pipes made of polyethylene. You can buy HDPE pipe for cable in Moscow both in coils and in sections of the required length with delivery to your destination. Our price for HDPE pipes for cable is the lowest - we cooperate with the five largest factories producing this type of product and receive the goods at a special dealer price. This allows us not only to maintain prices acceptable to the customer, but also to offer discounts and bonuses for regular partners and wholesale customers.

To protect communication lines when laying wires, it is most often used for cables in the ground. Its use as a protective shell eliminates the risk of damage to products during the construction of highways and during their operation.

Low pressure can protect wires (incl. power cable) from the influence of soil, mechanical shocks, as well as stray currents. Which ones are used for protection? utility networks and how to choose the right ones, read on.

Reasons for the high popularity of products

The most popular method of arranging electrical, communication, signaling and other networks is laying cables underground. And most often it is in the HDPE pipe. Therefore, manufacturers strive to make the range of manufactured polyethylene products as diverse as possible. special purpose. Despite the fact that this method of laying cables and wires is quite expensive, it is considered very popular.

For laying cables in the ground, they prevent the most different problems that are possible during the operation of utility networks.

The reasons for the growing popularity of these collectors in the construction of underground highways are:

Reduced risk of line damage external factors(for example, in adverse weather conditions).
Protection from vandals and frost.
Fire due to short circuit is excluded.

What types of products can be used to protect wires?

On the building materials market you can find all kinds of products that are suitable for laying utility lines in the ground. These can be not only HDPE collectors, but also PVC pipes, asbestos or asbestos-cement, steel. However, most often it is polyethylene materials that are used to protect the wire and power lines underground.

HDPE pipes (pipe for cable in the ground) come in several types:

or heavy
Hard with a smooth shell
(with 2 walls)
Halogen-free.

The main types of pipes that can be used in the ground.

Collectors representing one type or another are designed for specific purposes. For example, products with double walls can be used for underground wiring, one of which is corrugated, and the second is a LDPE sheath. Corrugated pipe is not suitable for laying cables in the ground. Even though it is characterized by increased elasticity and strength.

You can understand what certain materials are used for by looking at the markings on the product. It indicates (GOST, shell diameter and thickness, strength, nominal pressure indicator, product class and sometimes its purpose).

If you need an HDPE pipe for underground cables, consider its purpose further application and technical specifications. Thus, corrugated material is suitable for hidden electrical wires in rooms. Usually these are highways that are created during the arrangement of houses and run into the walls or ceiling. The most durable DSK corrugated collectors can even be used in the construction of a utility network in the floor (for pouring concrete or cement).

Depending on the number of cables in the intended network, the pipe may be different diameters. For example, if 2-3 wires with a cross-section of 95 mm² are laid, a product with an internal diameter of 63 mm can be used. They are sold in 15 m coils or in separate sections.

If it is necessary to lay a line of 2-5 cables with a cross-section of 25 mm² each, you can use collectors with an internal hole of 32, 40 or 50 mm, etc. Some manufacturers offer HDPE manifolds with large diameters ranging from 160 mm to 250 mm. Such materials are sold in 12 m lengths or 100 m (200 m) coils.

Laying methods and features

Laying cables in pipes can be carried out above ground or underground. It is also practiced to lay sheathed cables indoors. If you need to arrange electrical or communication system in a residential building, before carrying out work you should familiarize yourself with the features of the process. First of all, it is recommended to lay networks at temperatures down to -30⁰С.

It is necessary to ensure the tightness of all joints and nodes on the line to eliminate the risk of moisture and other contaminants getting inside the collector. If the operating conditions of the network suggest the formation of condensation in the pipe, additionally install a draw-through pipe to collect excess liquid.

Having made sure that such points have been taken into account, you can proceed to the next stage of work. Laying a cable in the ground in a HDPE pipe is not a very labor-intensive process, the main part of which is digging trenches. After preparing a recess of the required size, the collector is first laid, and then the cable is inserted into it. After inspecting the lines for damage and depressurization of nodes, developers fill the structure with sand and earth. Finally, warning tape can be laid around the entire perimeter.

Valuable product qualities

HDPE pipes designed for cables and their protection in the ground (their price is relatively low, if we take into account their long service life) have a huge number of valuable qualities:

lightweight and easy to guide the cable using a probe;
possibility of underground wiring with large radius angles;
resistance to different conditions operation (from mechanical influences before temperature changes);
possibility of operation for 50 years or more;
light weight;
use without additional grounding, etc.

As you can see, the use of HDPE pipes when laying underground utility lines is the key to their successful and reliable operation. Therefore, it is important to choose the right collector and take into account all the nuances of its use.

The video demonstrates testing corrugated materials for PVC and HDPE electrical wiring for fire:

When laying electrical cables, it is imperative to take care of their protection, regardless of whether communications are installed outdoors or in a building. The most common material used to protect communication networks are HDPE pipes (polyethylene pipes low pressure), providing reliable protection from any external influences. What kind of pipes the cable is laid in the ground will be discussed in this article.

Production of HDPE pipes

LDPE and MDPE polyethylene are used as raw materials for the production of corrugated pipes. Pipes that are not subject to combustion or are difficult to ignite, in addition to polyethylene, contain a fire retardant.

Production method polyethylene pipes is extrusion. All work is carried out using high-tech equipment that automatically monitors the quality of the finished product. Close control and tracking of performance indicators allows you to optimize the costs of raw materials, minimize the likelihood of defective production and reduce the cost of final products.

HDPE pipes consist of one layer, characterized by a smooth surface. Such a pipe does not pass electricity, has excellent strength characteristics and can withstand most aggressive chemical substances. The standard color of polyethylene pipes is black. Flexible HDPE pipes are well suited for installing electrical networks in a building.

HDPE pipes for laying cables in the ground

Pad electric cable underground can be done using the following types of HDPE pipes:

Lightweight corrugated;
Heavy corrugated;
Halogen-free;
Rigid smooth-walled;
Double-walled.

To give the corrugated pipe greater rigidity, you can use metal wire as a reinforcing element. Double wall pipes feature a smooth polyethylene inner lining and a corrugated top layer. Such a device has an increased degree of ring rigidity, which provides the structure with additional strength.

Smooth-walled pipes are best option for installation of electrical cables, which greatly simplifies the process of laying communications. The ease of installation is also supported by the low weight of polyethylene products, the installation of which does not require complex and bulky equipment. Pipe connection technology involves the use of couplings without sockets.

Double-layer corrugated pipes have all the advantages of polyethylene products, including the ability to be installed at sub-zero temperatures. Standard pipe for laying cables in the ground can last more than 50 years, which is considered a very good indicator in comparison with other building materials.

Classification of HDPE pipes for cable laying

When laying electrical networks, standard black pipes are usually used. A corrugated pipe for laying in the ground is excellent for arranging various communications whose power does not exceed 1 kW - and these are telephone and television cables, computer and household electrical networks.

Cable installation can be done in three ways:

Open;
Half-hidden;
Hidden.

All these methods are used to one degree or another both on the street and in the building. A corrugated pipe for laying cables in the ground has all the necessary characteristics, including high strength, flexibility, the ability to change linear dimensions and ease of installation, which greatly contribute to this.

Polyethylene pipes can be produced with or without a probe (broach). A broach is a special structural element that allows you to pass the cable along the inner surface of the pipe. Pipes with a probe are very convenient and can significantly reduce the time required to lay a communication line.

In addition, cable pulling in a pipe can be done using special devices, but this is very difficult and requires special equipment. Pipes that do not have a broach are quite suitable for reusable, but laying the cable in it requires a lot of labor.

Technical characteristics of HDPE pipes

According to the standards, ready product must not have any damage - various sagging, swelling, cracks and other defects are not allowed. In addition, the pipe should not delaminate. Interior pipes must be perfectly smooth, and the outer one must have a uniform structure.

Any HDPE pipe for cable laying must have high degree wear resistance. Polyethylene products are able to withstand internal pressure up to 20-38 MPa with a linear expansion coefficient of 140 Pa, depending on the type of pipe.

The working pressure value for different types pipes is as follows:

Light electrical pipes – 0.25 MPa;
Medium light – 0.4 MPa;
Medium HDPE pipes – 0.6 MPa;
Heavy pipes – 1 MPa.

Advantages of HDPE pipes

Among the advantages of HDPE pipes, one cannot fail to note their long service life, which under reasonable operating conditions reaches 50 years. To a large extent, this is due to the complete resistance of polyethylene products to corrosion and aggressive environments, as well as the absence of condensation on the surface of the pipe. Working temperature plastic pipes, at which they do not lose their characteristics, ranges from -25 to +70 degrees.

Installation of small diameter pipes is quite simple and does not require the use of special equipment. Various connecting elements are also not required - the possibility of free bending (of course, within reasonable limits) allows you to lay the pipeline in almost any conditions. Besides, polymer pipes They are not current conductors, so their installation does not require grounding, and their non-flammability prevents the structure from burning even in the event of a short circuit.

Marking of low pressure polyethylene pipes

All HDPE pipes must be marked in accordance with the standards. Labeling not only allows you to classify different types pipes, but also makes it possible to control the quality of products - the applied markings are a guarantee of the suitability of the material for use.

Each pipe has symbols that display the trademark or full name of the manufacturing company. Labeling can be carried out according to national or international standards. The next element is the material of manufacture. For example, a pipe made of PE 80 is displayed as MRS 8. The pipe must also have a designation of the minimum wall thickness, outer diameter and nominal pressure (bar).

A separate paragraph may indicate the suitability of the pipe for constructing a gas pipeline network or transporting drinking water. The last marking point is the batch number and date of manufacture of the pipe.

HDPE pipes are divided into six classes, with the following designations:

Heavy - T;
Medium-heavy - ST;
Medium-lightweight – OS;
Average – C;
Medium light - SL;
Lungs – L.

Selecting HDPE pipes for cable laying

You need to choose the protective material for laying cables in the ground wisely. Perhaps the most important parameter, which must be taken into account when choosing, is the number and dimensions of the wires of the communication network. There is a direct relationship between these indicators and pipe sizes, which can be understood if we take a closer look at the most popular standard sizes corrugated HDPE pipes

When choosing a material, you need to know exactly the dimensions of the pipes. The diameter of standard polymer products can vary from 16 to 225 mm. Pipes with a small cross-section (up to 90 mm) are produced in coils, the length of which can be 100 or 200 m. If the diameter exceeds 90 mm, then the length of single pipe sections is 12 m.

To assess the strength of a pipe, you need to know what the SDR parameter is equal to. To calculate this parameter you need to divide external diameter by wall thickness. Strength based on this parameter is assessed simply: the smaller the calculation result, the greater mechanical strength has the product.

Features of laying technical pipes

Technical pipes can be laid outdoors, underground and in any buildings. When laying protection in a building, the pipeline should not be located openly, but installed in concrete, brick or plasterboard walls.

The main nuances that arise during work are as follows:

Installation of polyethylene pipes is possible at temperatures environment not lower than -30 degrees.
If the structure will be laid in a trench whose depth exceeds two meters, you need to take care of a protective concrete channel 80-100 cm thick.
If the pipeline is horizontal, the protection can be firmly concreted into the foundation.
When laying HDPE pipes for cables in the ground, it is necessary to ensure the tightness of all connections - this will protect the structure from various contaminants getting into it. For connection individual parts pipes are best suited compression couplings and butt welding. Using fittings in the pipeline design, you can simplify installation and increase the reliability of the connection.
In the event that the structure will operate in conditions where condensation may occur, care must be taken to install a draw-out tube that will collect moisture.

Laying electrical cables in structures

When settling in hidden wiring It is quite possible to use smooth or corrugated pipes - there is not a single standard that would prohibit such protection.

The installation procedure for HDPE pipe is as follows:

First you need to mark all the points through which the cable will pass;
The pipe is fixed in accordance with the selected trajectory;
An electrical cable is pulled through the pipe;
The structure closes concrete screed, if the pipeline is on the floor, or with plaster if the communication is located on the ceiling or wall. Laying the cable in a pipe allows you to later repair or update the wiring without compromising the integrity of the surface under which the pipeline is located.

If desired, pipes can be attached to the floor using metal brackets, and holders with a latch are suitable for fixing the structure to the wall or ceiling. In any case, when laying the cable, you need to make sure that there is no tension.

When arranging communications indoors, you can use connecting elements for installing sections of pipeline, but best choice there will still be corrugated elements - this will avoid kinks in the smooth pipe, due to which the material can be deformed.

Laying cables outdoors

The need to lay cables outdoors often arises on your own land plots. Certainly, we're talking about, including the protection of the electrical network. Before laying the cable in HDPE pipes, you need to make sure that there is no damage to its structure.

Laying HDPE pipe for cable in the ground is as follows:

First you need to mark a trench of suitable dimensions and dig it;
A pre-selected HDPE pipe is laid in the trench for underground laying cable;
There is a cable in the pipe (there should be no tension);
After pulling the cable, the pipe is covered with a 10 cm layer of sand and a 15 cm layer of soil.

To ensure that the laid cable can be found in the future, it is worth leaving a warning tape or similar material above it. When laying pipes in the ground, it is advisable to refrain from connecting them using couplings and other connecting elements - they can cause a seal failure. Fittings can only be used to enter an electrical line into a building.

Trenchless method of laying cables in the ground

In some situations, it is not possible to prepare a trench for laying a protective pipeline. In this case, it is possible to lay the cable in the pipe only with the help of special equipment that makes it possible to implement a trenchless installation method, for which the soil is drilled horizontally - HDD drilling technology, which often has no alternative. Before work, in addition to preparing the equipment, it is necessary to obtain a drilling permit and conduct a geological analysis of the soil.

Cable laying in the protective pipe is carried out according to the following algorithm:

First, a pilot well is drilled;
The size of the well increases;
A HDPE pipe with an electrical cable inserted into it is installed in the well.

When drilling a well, the soil is punctured, through which a solution will be supplied into the ground, filling the well, adding strength to it and cooling the tool during operation. To expand the well, a trimmer is used, which is installed on the equipment instead of the previously used drill head. Installation of HDPE pipes into the well is also carried out using equipment.

Horizontal drilling technology has one significant drawback - the work requires specific skills and equipment. Because of this, only companies specializing in soil drilling are able to implement this method.

Conclusion

HDPE pipe for laying cables in the ground allows you to protect electrical line from possible damage caused by external factors. Polyethylene products have all the necessary characteristics and have affordable price, so they should be considered first.

When installing communication networks, HDPE cable pipe 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 aggressive soil influence. The laying technology is determined by the purpose of utility networks and their location.

HDPE pipes for cable laying

Using HDPE pipes for installation of communications

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

When installing electrical wiring in a floor screed or brick wall, use smooth pipe Black HDPE.
Products with a corrugated surface are used for laying open, semi-hidden and in hidden ways electrical, telephone, television and computer networks operating at alternating or alternating voltage direct current, the value of which does not exceed 1000 V. An electrical installation of this type can operate both outdoors and indoors.
Used for laying in the ground corrugated pipes HDPE, which is characterized by increased elasticity and strength, the ability to restore its linear dimensions and ease of installation.

Depending on the design, products are available with or without a probe. He is special device, which is designed to pull the cable inside the pipe. This allows you to reduce the time it takes to install power networks and communications.

In the absence of a probe, cable pulling is carried out using a reusable device. The complexity of the operation increases slightly, and certain technical support is also required. However, HDPE pipe for laying cables without pulling can be used repeatedly. This opportunity is relevant for private repairs of communications.

Corrugated cable pipe with probe

Among manufacturers of HDPE pipes for laying electrical cables, the products of DKS are the most in demand. It is represented by “Octopus” corrugated products, designed for installation of hidden wiring indoors. The line has been supplemented 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 Octopus pipes are used. They reliably protect electric wires from damage as a result of mechanical influences and environmental influences. 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 GOST requirements for laying power lines and various communications - the use of products from recycled materials is allowed. HDPE technical pipe is made from production waste, which is mixed with various polyethylene additives. This makes a bit of a difference performance characteristics and color of the finished product, but can significantly reduce costs and reduce its cost.

Besides, cable pipes HDPE has the following advantages:

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

The cable in a HDPE pipe can be laid along any curved path without the use of connecting elements, since the polymer can be bent. It is especially easy to change the configuration of small diameter products.

However, you should not bend the HDPE pipes too much: this may cause a bend and it will not be possible to stretch the cable.

Methods for laying electrical cables

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 necessary components.

Installation in building envelopes

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

outline the location of the cable;
fix the pipe, and it can be attached to the floor using metal brackets, and to the ceiling or walls - with special holders with a latch;
stretch the cable so that it is positioned freely, without tension;
the structure on the floor is filled with a concrete screed, and in the wall or ceiling it is sealed with plaster or other materials, depending on the diameter of the protective case.

Laying cables using HDPE pipes on the floor

HDPE pipe allows you to:

reduce the length of electrical wiring;
realize renovation work and re-tensioning of cables 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 casing: bends, couplings and other components. However, corrugated elements are most often in demand for turns 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 standards for the installation of hidden electrical 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 in summer cottages. Before starting work, you should inspect the cable and check the integrity of the sheath. If it is damaged protective function HDPE pipes will be useless.

Then during the installation process the following operations are performed:

make markings and dig a trench of the required depth;
place a HDPE pipe with or without broaching of the required diameter into it;
stretch the cable and lay it in such a way that it is positioned without tension;
fill the pipe first with a layer of sand 10 cm thick, and then with soil about 15 cm.

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

Laying cables using HDPE pipes in the ground

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

To lay the cable on 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 installation

Trenchless technology is used to lay electrical cables located in hard-to-reach places. Most often it is in demand by public utilities, as it is performed using sophisticated equipment and special equipment.

The essence of the method is 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:

Drilling a pilot well. The soil is pierced using a drill head, which has a bevel in the front part and built-in radiation. As it enters the ground, a solution is supplied through special holes to fill the well. It reduces the risk of collapse and cools the hot tool.
Well expansion. It is performed with a rimmer, which replaces the drill head.
Laying HDPE pipes with cable inside. They are pulled into the well using a drilling rig.

Cable laying using horizontal drilling method

The main disadvantage of horizontal directional drilling of soil is the complexity of its implementation, therefore, for such work, an agreement is concluded 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 ensure reliable protection for a long period of time; you just need to follow the technology for installing power lines and other communications.

The concept of “dacha” often implies the presence of not only the main residential building, but also several additional economic facilities.

Garage, summer cuisine, gazebo, sauna - these buildings are necessary on the farm and must be uninterruptedly supplied with electricity.

Subtleties of underground wiring in a summer cottage. How to choose a cable corrugation

One of the ways to lay an electrical cable through a summer cottage is underground. This option is solid, reliable, aesthetic (wires do not spoil appearance courtyard). However, it requires strict adherence to technology and instructions. A mandatory item is the purchase of cable corrugations and a special protective sheath.

Of course, you need to pay special attention to choosing a cable suitable for laying in the ground - this cannot be done without consulting an electrician. But it is equally important to choose the protection in which it (the cable) will be “packed” when laid at depth in order to ensure its integrity and functionality for the entire period of operation.

The main thing you need to know: underground wiring requires the use special corrugation HDPE. “HDPE” is an abbreviated name for the main material of such a pipe, low-density polyethylene. This corrugated pipe is characterized by increased strength and has a number of specific characteristics. The installation process itself is another story, but below we will share what we obtained from an electrician advice on selection.

The main differences between corrugations for underground cable laying and conventional ones

Double-walled design: the outer shell is corrugated, which guarantees high strength of the pipes, and the inner wall is smooth (this ensures easy cable pulling along the entire length).

Resistance to shock loads and vibration and at the same time plasticity in operation. This allows you to use HDPE corrugation for laying cables on open areas, and in soil or concrete screed.

A wide range of operating temperatures that the corrugation can withstand without damaging consequences (from -40 to +90°C).

The double-walled corrugated pipe in coils is equipped with a special broach (probe) for the convenience of threading the cable along long sections. Bays are found in lengths of 20, 50 and 100 meters (larger lengths for wiring on private properties are rarely required).

Visually, a corrugated pipe suitable for underground use also differs from a regular gray PVC pipe in red or orange(less common, depending on the manufacturer, is black).

The diameter of the HDPE corrugation depends on the characteristics of the cable selected for laying in the ground. For dacha underground wiring, most often a pipe with an external Ø40 mm and an internal Ø32 mm (also the minimum possible) is chosen. For example, .

Why? The fact is that for underground installation in the courtyards of private cottages, electricians often recommend VVG 3x2.5 with an external Ø10.5 mm (the cross-section of such a cable is sufficient for the household power supply of most outbuildings). Judge for yourself: a cable of this girth fits into double layer pipe with internal Ø32 mm. The maximum possible values of corrugated pipes reach Ø200 mm, but these are used for purely industrial purposes.

When purchasing corrugated pipes in pieces 6 meters long (by the way, not all specialized stores sell such pieces, check this point right away) be prepared for the fact that there is no broach in them. And this is justified because It is not difficult to stretch the cable over a short length without pulling.

Try to choose even a corrugated pipe for laying in the ground, non-flammable.

The compressive strength of the selected pipe should be high - focus on a minimum of 6-8 kPa.

But the level of resistance to ultraviolet radiation can be neglected here, because underground the issue of sun protection is not relevant.

Special corrugation is important

Imagine the titanic physical, time and material costs that will entail replacing a failed cable buried in the ground summer cottage at a depth of 70-80 cm. This is not for you to dig up potatoes! Purchasing a special protective corrugation is not an extra (note, one-time) expense, but the necessary insurance in order to enjoy the benefits of your dacha comfortably and easily for many decades.

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