Laying wires in corrugation: how many can be laid

General requirements

The external electrical line is laid along the architectural lines of the building.
The use of armored elements with a flammable fibrous coating is prohibited. It is unacceptable to use both power and telephone wires within the same bundle. The distance between them must be at least 25 mm. When installing several conductors, you should try to make the smallest number of overlaps. When laying SIP in accordance with the PUE, you need to maintain certain distances between it and certain parts of the building:

• above the window and door - 0.3 m;
• below the balcony and window - 0.5 m;
• height above ground level - 2.5 m;
• on the side of the window - 0.5 m;
• on the side of the balcony and door - 1 m.

When running the power cable along the wall, it is necessary to maintain minimum distances to windows

Installation of electrical wiring in corrugation - requirements

When using corrugated tubes for laying electrical cables, the following PUE standards must be observed:

regardless of the installation method, soldering, terminal strips or crimping must be used to connect individual sections;

Terminal block

all connection points of cable lines placed in corrugated channels must be equipped with distribution boxes;

the main and backup cables, working and emergency lighting lines are allowed to be installed only in separate corrugations;

non-fire-resistant plastic corrugations can only be used for internal wiring inside brick, panel and concrete walls and ceilings;

the organization of lines inside wooden walls and ceilings can only be carried out in combination with fireproof separating gaskets 10 mm thick made of cement, plaster, etc.

the permissible distance from the plastic corrugation laid on a fire-resistant base is at least 100 mm;

the height of the open cable line inside the corrugated cable above the combustible base is from 10 mm (to implement this requirement, special foam pads are used);

It is prohibited to install metal pipes in bathrooms and other rooms with high levels of humidity;

internal and external organization of cable lines in metal corrugations is permitted only if the tubes are sealed (failure to comply with this condition, even if a small amount of moisture gets inside, can result in complete burnout of the wiring).

The permissible height of open supply lines indoors is at least 2 m

Thanks to the use of corrugated casings, it becomes possible to ignore this limitation. The fact is that all products of this type have the necessary strength characteristics sufficient to ensure the safety of current-carrying lines in the event of penetrating impact from objects with a diameter of 12.5 mm or more

When using steel corrugations, they must be connected to grounding equipment and equipped with additional corrosion protection. Restrictions on the resistance of a grounded corrugated channel up to the point of commutation with the bus are 10 Ohms. When designing the laying direction, it is necessary to avoid points of moisture accumulation. All connections to distribution boxes must be insulated in a standard manner.

Is it necessary to lay the cable in corrugation?

The decision to use corrugated pipes when organizing a cable line is made in the presence of the following circumstances:

• Fire hazard. If the base for the wires is walls or ceilings made of flammable materials (wood, wood boards, lining), then to minimize the risk of fire, the wiring must be placed in fire-resistant protective shells.

• Possibility of mechanical damage. Lines placed behind wall sheathing or trim are sometimes damaged during drilling attempts. Having stumbled upon a corrugation, there is a chance to catch yourself in time and move the immersion point of the drill to another place.

• The presence of turns, bends, etc. Conventional cable ducts or pipes in this case do not have the required flexibility. Corrugated products here will be an excellent solution to the problem.

• The need to periodically replace the cable. If you simply bury a wire in a wall or floor, it will be impossible to do this without destroying the exterior finish. The corrugated pipe makes it possible to perform the procedure without the need to dismantle the coating.

• Direct climate impacts. A cable running outdoors is subject to the damaging effects of sunlight, precipitation, temperature fluctuations, etc. To maximize the safety of the power supply to a residential or industrial facility, the wiring is placed inside a protective corrugation.

• Underground installation. In addition to increased humidity and mechanical stress due to soil movement, a line laid underground is exposed to danger from rodents.

• Sites in any enclosed spaces. This refers to attics, basements and niches behind suspended ceilings and plasterboard walls.

• Increased humidity in the room. To protect the lines in this case, corrugated PVC pipes are used.

Installation of electrical wiring in corrugated open method

Installation of exposed electrical wiring in a wooden house

Installation of corrugated pipes includes several stages. Algorithm for installing electrical wiring in a corrugated open method:

1. To fix the hose, special clips made of high-quality plastic are used. They come in different sizes; the choice will depend on the diameter of the pipes used.
2. Clips are attached to surfaces at intervals of 30-40 cm. This is done using dowel screws or self-tapping screws. The choice of parts depends on the material from which the surface is made, for example, wood, concrete, brick, etc.
3. For reliable fixation, the corrugation is pressed into the clip until a characteristic click appears. If the clips were selected correctly, the possibility of spontaneous loss is excluded.

At the design stage, when laying out a schematic wiring path, you need to take into account the following important points:

• The maximum and permissible radius of rotation of the corrugation is 90 degrees. The smoother the angle, the better.
• Turns should not be located close to each other; the optimal distance between them is 4-5 meters. If this is not possible, for safety reasons the wiring is additionally equipped with a junction box.
• The maximum length of an individual section is 25 meters, the permissible number of turns is 4.

How many wires can be laid in one corrugation

Selection table for corrugated pipes depending on the number of wires and cross-sectional sizes

According to the rules for installing electrical installations, it is necessary to lay the main and backup cables, as well as the cores of emergency and working lighting, through different channels.

Approximate calculation of how many cables can be laid in one corrugation:

• With a diameter of 16, 3 cables fit.
• If it is 20, 4-5 will fit.
• Diameters greater than 25 accommodate 5-6 cables.

The exact quantity is calculated provided that the pipe length is at least 35 meters.

The advantages of corrugation are its affordable cost, light weight, which greatly simplifies the process of transportation and installation, high resistance to thermal and mechanical influences, and long service life.

As a rule, there are no difficulties when choosing and installing corrugated pipes

During work, you must observe personal safety precautions; when working with electrical cables, it is important to de-energize the room and check the voltage in the conductors

Non-standard cases

The first and most common situation is when the string is pulled away from the conductor due to strong tension. In this case, it is recommended to cut off the part of the corrugation that has already been threaded and leave it, then reconnect the wire to the end of the cable and finish pulling. The two pieces of corrugated pipe are then connected with electrical tape.

Pulling the wire through the corrugation, if there is no broach, is also not difficult. It is enough to simply bend the end of the conductor 180° and insulate it so that it does not cling inside the pipe, and then push the product through the entire required length. This technology is clearly demonstrated in the video below:

How to start a wire without a probe

If you have little space in your apartment and you need to thread a long section of corrugated pipe yourself, for example, 30 meters, it is not always possible to do this in a room without experience. In this case, it is recommended to first connect the cable to the string, then go out into the entrance and secure the free end of the wire to the railing on the top floor. After this, stretch the corrugation until the problem is solved. Or use the Health disk as shown in the following video (second minute):

Sometimes it becomes necessary to stretch a conductor in a corrugated pipe along the ceiling, or rather inside a suspended plasterboard structure. This is quite difficult to do, because... if the sheets are already sewn up, installation must be done through grooves under the lamps. In this case, a regular string will help to insert the corrugated pipe through the ceiling. In the video tutorial, the masters clearly demonstrated the essence of the work:

How to lay a corrugated hose through a plasterboard ceiling

Well, the last situation that I would like to describe is laying a cable with rubber insulation in a corrugated area. The difficulty lies in the fact that when pulling, strong friction occurs between the walls of the corrugated pipe and the insulation of the conductor. As a result, even the wire does not facilitate the process, and if there is no broaching, in this case it is generally unrealistically difficult to complete the installation. A special lubricant comes to the rescue, for example Wire Pulling Lubricant from 3M, with which you can quickly pull the cable through a corrugated pipe. The cost of such a lubricant is a little high, however, if you often perform electrical installation work, we recommend purchasing it, because One bottle lasts a long time.

That's all the information we wanted to provide

Please note that it is better to tighten a cable with a cross-section of 3*1.5 mm2 into a pipe with a diameter of 16 mm. At the same time, for a section of 3 * 2.5 mm2, a diameter of 20 mm is needed

Now you know how to pull the cable into the corrugation with your own hands and what to do if there is no pull!

It will be interesting to read:

• How to conduct electrical wiring in a wooden house
• Electrician tool set
• Methods for attaching the cable to the wall

Wiring protection

Modern cable for electrical networks is made of copper and covered with a special sheath. When installing systems under a plasterboard finish, there is a high probability of damage to the wires, since the gypsum boards are attached directly to the perforated frame with self-tapping screws

Thus, it is important to use protective corrugation to eliminate the possibility of damage to the wire by self-tapping screws

Corrugated tubes are characterized by increased flexibility, so they do not complicate the installation process, providing reliable protection from mechanical stress. This approach eliminates the risk of short circuit

Additionally, such products increase the waterproofing properties of the wiring, which is important when using the network in the kitchen, bathroom or toilet, and also protect the cable from rodents (in private homes)

Installation of wiring under plasterboard in corrugation

Alternative options are polyvinyl chloride tubing and plastic cable ducts. Their protection is slightly better, but the installation process is significantly more complicated. Unlike corrugation, it is almost impossible to bend ordinary plastic.

What is corrugation and where is it used?

An electrical installation corrugation is a corrugated pipe for laying an electrical cable for the purpose of protecting it or protecting structures. Laying electrical cables in corrugated tubes is used in various situations with open or hidden electrical wiring.

Hidden gasket

Hidden installation is the installation of electrical wiring inside the structures of walls, floors and ceilings, behind finishing materials. It is conventionally divided into the following types of installation:

Laying inside non-combustible structures is carried out in grooves of walls and ceilings, in floor screeds or simultaneously with the installation of load-bearing structures (for example, when concreting). In this case, corrugation is used for ease of installation, protection from cable crushing and the ability to replace electrical wiring without disturbing the finishing material, chipping or dismantling wall, ceiling or floor structures. When laying corrugated cables inside structures made of non-combustible materials, the PUE allows the use of any type of corrugated tubes.

Laying behind finishing materials or in false spaces has purposes similar to laying in non-combustible structures (protection from mechanical damage, the ability to replace wiring if necessary), but with the installation requirements being met, as when laying over combustible materials. The fact is that finishing materials often promote combustion, so the requirements for such installation are quite strict. It is important to use flame retardant or metal corrugations for such installation.

Underground installation is carried out during landscaping work for wiring electrical power lines to lighting fixtures and various equipment (sprinkler pumps, gate and door opening systems), when laying low-current networks for security systems or telephone lines, and in other situations. The main requirement for such installation of corrugated electrical cables is water resistance and high resistance to mechanical deformation (rigidity).

Cable laying without corrugation

Electrical wiring in a home can be installed in several ways, depending on:

• cable type;
• the environment in which the wiring is planned;
• base material on which installation work will be carried out.

Cable laying without corrugation can be done in an open or hidden way.

Open installation method

When installing power cables on combustible structures or in places where it is difficult to make grooves, open wiring is used. It is laid over the walls and along the ceiling with a finished finish.

Fastening is carried out with brackets (clamps) at least every 40-50 cm, and in places of bending, 10 cm on each side of the bending point. The fastening frequency should be such that the cable does not sag.

This installation method is used mainly in basements, utility rooms, and garages. It is also possible to install wiring in residential premises on walls and ceilings without corrugation, if the cable has a fireproof sheath.

Open wiring in retro style in wooden houses is performed with single-core conductors twisted together, attached to the surface of the walls (ceilings) using porcelain insulators. There may be two or three wires, depending on whether there is grounding in the house.

In the manufacture of modern retro cables, copper wires with a cross-section of 0.75-2.5 square meters are used. mm. First, they are covered with a layer of PVC, after which there is decorative insulation made of silk impregnated with a composition that does not support combustion. Fiberglass covering may be used.

Installation in a metal pipe is one of the most labor-intensive, expensive and at the same time reliable methods of open wiring. Most often used:

• in fire and explosive areas;
• when passing through ceilings and walls;
• for inputs into cable kiosks;
• for outdoor installation;
• in wooden houses, baths, etc.

Metal pipes reliably protect communication networks from mechanical damage and aggressive environments. In addition, open wiring in metal pipes can be an interesting design solution when decorating a room.

Hidden electrical wiring in the walls

To give the room the most aesthetic appearance, hidden electrical wiring is used. The cables are hidden in the wall (ceiling) material, hidden under a layer of plaster.

The cable is laid in grooves - specially cut grooves, the width of which must correspond to the thickness of the conductor. Obviously, it is better to do without corrugation here, since making furrows for it is much more difficult.

It is more convenient to install electricity before finishing work, then you can do without gating. First, the wires are fixed, and then the walls are plastered.

Before installation work, markings are made for the future electrical system of the apartment. Mark the installation locations of sockets, switches, junction boxes, and wiring lines.

Then they start cutting the grooves. To do this, you can use a hammer drill, wall chaser, grinder with a diamond blade, or impact drill.

After the places for sockets, switches, junction boxes and grooves for laying cables are ready, installation of the electrical network begins.

Errors and rules for installing corrugated cables

do not create sharp corners when designing routes

To increase the length of a single piece of corrugated tube, use special transit boxes, tees and couplings

Do not connect the tubes to each other using electrical tape. Install connecting accessories at turns, corners and closer to the middle of the entire area.

You cannot stretch several cable lines in one corrugation at once

power networks and low current must be separated from each other, maintaining appropriate distances

if you are not running a cable in a corrugated pipe, but individual wires, here is a table for selecting the maximum cross-section of conductors and their number, depending on the diameter of the tube:

Recommended corrugation diameters for different networks:

Corrugation d=16mm is usually used on the lighting line

for power sockets with a diameter of at least 20mm

for coaxial cable for video surveillance – no less than 25mm

for low current (telephone, internet, TV cable, alarm) D=16mm

Safe installation

Before installing the cable, make sure it is intact. Special distribution boxes are used for each individual section. Avoid any twists that reduce the reliability of the system as a whole. The boxes described above are placed on the walls at a safe height to prevent moisture from entering during flooding or interference from children. In some cases, the selected height may be minimal.

The installation box can be installed directly in the floor. In this case, it should be protected by a durable removable lid that can be easily removed so that, if necessary, the master can access the contents. Don’t forget about the possibility of creating a floor wiring diagram, which will make it easier to find the right node or wire in the future.

Junction box in the floor

Another important condition for increasing the safety level of electrical wiring is the correct filling of the corrugation. Do not try to cram a lot of wires inside such a tube.

It is advisable to leave about 60% of the total tube space empty. The maximum length of one line (from the distribution panel to the socket or switch) should not exceed 20 m. When placing at right angles, make sure that there are no more than two cables. However, the recommendation is similar for situations with sharper angles. Try to avoid any sharp bends.

In wooden houses, placing wires along joists is unacceptable. Installation is carried out using pre-drilled technical holes. When using wooden parts, they must be treated with a high-quality composition that prevents combustion. Avoid branching the route directly from the panel, this will significantly complicate repair work if the electrical wiring is damaged.

Laying wires in the technological holes of the log

Laying cables in cable ducts

Electrical cables can be installed using the cable channel method. In this case, a specialized box made of aluminum, steel, and plastic is used. The power cable will be located inside this box, which provides reliable protection and aesthetic appearance of all electrical wiring. This also increases the level of fire safety.

Cable channels are most often white; there are options that imitate natural wood. Laying a power supply cable in channels is a simple process performed in several stages:

• Initially, the lid is removed from the box;
• The product is fastened using dowels;
• A box is placed in the channel and the lid is closed.

This installation of the cable channel takes a minimum amount of time and allows you to obtain an optimal aesthetic solution. Electrical installation should be carried out by an experienced specialist, which will eliminate the formation of errors and subsequent problems.

Corrugated cable laying

Laying corrugated cables along the wall can be done using special clips, the diameter of which is selected in accordance with the cross-section of the corrugated pipe. This method of fastening looks the most aesthetically pleasing, but in hidden places, as a rule, staples made of metal packaging tape are used, secured with dowel nails.

Inexpensive couplings are used to join pieces of corrugation. If there are no cable connections in this area, then the place where the pipe is attached to the coupling can be sealed with a sealant; otherwise, more reliable insulation methods should be used. For passages through walls, special sleeves are selected, which are also sealed if necessary.

When laying, it is very important to avoid bending corrugations of less than the permitted radius; such information is usually indicated by the manufacturer on the product packaging.

Practical advice on choosing corrugations

• 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.
• Even for laying in the ground, try to choose a corrugated pipe that does not support combustion.
• 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.

Features of installation of electrical wiring in corrugated open method

When installing open electrical wiring in accordance with the requirements of the PUE, the distance from the corrugated pipe to the combustible base must be at least ten millimeters. It is clear that, for example, in a wooden house such a condition cannot be met without the use of special gaskets. Penofol, which has the most balanced combination of price and quality, is often used for such purposes. It should be taken into account that in order to comply with fire safety requirements, the gasket must protrude 10 mm in all directions from the border of the plastic corrugation.

According to the PUE, installation of open electrical wiring in rooms at a height of two meters above the surface is allowed. The use of corrugations allows you to circumvent this limitation, since they all have the necessary degree of strength to protect cables from damage by penetrating objects with a diameter exceeding 12.5 millimeters (IP20). Indeed, according to the same PUE, the fulfillment of this condition allows the installation of open electrical wiring in rooms at any height, but it should be taken into account that wiring of this type cannot be used on roofs, with the exception of the place where the cable enters the building.

How many wires can be laid in one corrugation

Table for selecting corrugated pipes depending on the number of wires and cross-sectional sizes. According to the rules for installing electrical installations, it is necessary to lay the main and backup cables, as well as the cores of emergency and working lighting, through different channels.

Approximate calculation of how many cables can be laid in one corrugation:

• With a diameter of 16, 3 cables fit.
• If it is 20, 4-5 will fit.
• Diameters greater than 25 accommodate 5-6 cables.

The exact quantity is calculated provided that the pipe length is at least 35 meters.

If the integrity is damaged, metal structures are soldered using a special acid. If the integrity of the plastic corrugation is damaged, the holes are welded with polyethylene.

The advantages of corrugation are its affordable cost, light weight, which greatly simplifies the process of transportation and installation, high resistance to thermal and mechanical influences, and long service life.

As a rule, there are no difficulties when choosing and installing corrugated pipes. During work, you must observe personal safety precautions; when working with electrical cables, it is important to de-energize the room and check the voltage in the conductors.

Pros and cons of this installation

You should not lay a cable in the floor without knowing all the intricacies of this process. And you should start with the advantages of hidden electrical wiring:

• High degree of electrical safety. The floor covering (floorboard, laminate, linoleum) will become the dielectric that will prevent the spread of potential in the event of a cable breakdown. This means that a person will not be shocked by electric current even if he stands in the place under which the cable passes.
• Less spending. High-quality wiring will require less cable, which will provide significant savings.
• Ease of operation. The most difficult stage will be pouring the concrete floor. When installing electrical wiring, you need to insert the cable into the corrugation and simply lay it on the floor. Many electricians do not even attach the corrugation to the concrete base.

But in addition to its advantages, any work also has its disadvantages. The disadvantages of installing cable wiring under the floor include:

• The complexity of identifying and eliminating the malfunction. If the cable breaks down, you will have to lay a new line or dismantle the floor surface.
• Additional expenses for pouring a new floor if dismantling is required. Also included in the category of additional investments is the consumption of corrugation, without which the cable cannot be laid in the floor.

Installation technology

We suggest you familiarize yourself with the basic requirements for installing wiring in corrugated pipes, common mistakes and simple ways to stretch cable ties through the corrugation.

Requirements and errors

When laying wiring in a corrugated pipe, ensure that the following conditions are met:

• the length of one section without transit elements (couplings, tees, splitters) should not exceed 25 m, the number of turns - up to four;
• A one-piece corrugated hose cannot be installed at an acute angle;
• avoid close proximity of two or more turns of the route;
• the rotation angle should be more than 90 degrees, the radius should preferably be larger;
• two corrugated pipes should be located at a distance of at least 200 mm from each other;
• do not connect pipes using electrical tape - it is advisable to use connecting accessories, placing them in the middle of the section, turns and corners;
• one corrugation – one cable network;
• power and low-current lines should be separated from each other (standards are prescribed in the PUE).

Installation of electrical wiring in a corrugated

When installing electrical wiring by any method, a universal requirement is the use of terminal strips, soldering, crimping or brazing to make connections. The contact points of the conductors must be accessible for inspection, so if the cables are placed in corrugated pipes, the connections should be placed in junction boxes.

Another requirement of the PUE is the need to separate the main and backup cable lines, working and emergency lighting cores into different channels, that is, the corrugations with these wires must be geographically separated.

Plastic corrugation, which is not fireproof, is allowed to be placed in the grooves of walls consisting of concrete, bricks or other fireproof materials. In all other cases, for example, when installing hidden wiring in wooden houses, fireproof gaskets (cement, plaster, asbestos) should be used to separate the corrugated tubes from the surface at a distance of at least 10 millimeters. When laying plastic corrugation on a fireproof surface, the distance from combustible areas should be more than 10 centimeters.

Metalsleeve

This product has certain advantages compared to plastic counterparts. The metal corrugation for the cable is insensitive to ultraviolet radiation and temperature changes. It will withstand mechanical stress, as well as contact with aggressive chemicals. And, of course, the level of fire resistance of such a product will be higher. Therefore, when laying cables on walls made of flammable materials, it is advisable to choose a metal structure.

There are several options:

• using galvanized steel;
• with wrapped tinned steel tape;
• with PVC insulation.

If you need a high level of waterproofing, then it is advisable to choose a hose with an additional self-extinguishing plastic coating. It will protect against dust and moisture in the bathroom or in structures on the site. But the steel tape somewhat reduces the cost of the structure, but at the same time it becomes less resistant to mechanical stress.

Types of corrugations for laying cables

Corrugated cables are available in different strengths:

• Easy. It has a thin wall and the highest degree of flexibility. Recommended for installation under cladding in walls and ceilings. Doesn't hold mechanical load well.
• Average. A little thicker than light, but not as stiff as heavy. Can be used in walls and screeds. They are good for walls, but it is better to lay heavy corrugation in the screed.

This is a double-walled corrugation - ribbed on the outside, smooth on the inside. It makes re-tightening the cable no problem.

As you can see, the classification is based on strength properties, which determines the area of ​​use.

Varieties

In addition to all this, there is also corrugation with and without broaching. A broach is a thin cable or wire that makes it easier to tighten the cable into the corrugation. The cable is tied to the end of the cable, pulled at the other end, tucking the cable inside. Without pulling it will be difficult to cope with this task - with sufficient rigidity, several meters of cable can simply be pushed inside, but if the route is long, this will be too difficult.

The cable corrugation can be with a broach (the correct name is “probe”) or without

If we talk about the types of plastic corrugation, we must mention that there is a two-layer corrugation. On the outside it has the same ribbed surface, but on the inside it is smooth. Corrugation for a cable of this type is expensive, but if necessary, you can actually stretch a new cable into it. In those events where the inner wall is ribbed, this is not always possible - if the track has a minimum of turns, and even those over a wide radius.

Metal and metal-polymer corrugation

Metal corrugation for cables also varies. It is made of galvanized or stainless steel. In addition, there is a metal corrugation with a polymer coating. It has the best characteristics for protection against dust and moisture. This protective shell is also called metal-polymer.

Laying the cable (wire) in a corrugated tube

Laying the cable in a corrugated tube It often becomes necessary to lay the cable after the entire electrical wiring system has been installed. It happens that temporary routes need to be laid, or there are no conditions at the site for capital laying, or it is not required at all. In such cases, use a cable box or corrugated tube. Corrugated pipe has some advantages: it is more flexible, cheaper, easier to install and does not require geometric accuracy when laying the line. The corrugated tube does not support combustion (conditionally non-flammable) - when the cable catches fire, it melts, covers and compresses the fire site, connects the cable leads, which leads to the activation of protection devices. Let's consider an example of laying a cable in a corrugated tube when solving a specific problem. Task:

organization of lighting and installation of sockets in a semi-basement unplastered room. You need to install:

4 lamps, 2 sockets, shield (we must install an RCD).
Preparation and materials
We select moisture-proof places for installing the panel, lamps, sockets, and junction boxes.
We outline the cable laying route. For our purposes, a fire-resistant cable with double insulation with a monolithic core, cross-section 3x1.5 or 2x1.5 - type VVG: VVGng-LS, VVGng-P or NYM: NYM-J, NYMng-LS-O is suitable. We measure the required length of the corrugated pipe from the lamps to the distribution boxes, and the common line to the switchboard. For cables with a cross-section of 1.5-2.5 mm, a corrugated tube Ø 16-18 mm is suitable. Installation
We mark the line along the laying route and install fastening clips. The distance between the fasteners is 30-40 cm. If this distance is increased, the tube will begin to sag over time. After this, we pull the cable into the tube. It is better to do this before the corrugated tube is secured in the clips - the more bends and turns along the laying route, the more difficult it will be to stretch the cable. The corrugated tube has a special conductor blank (conductor) made of fairly strong steel wire. We pierce the insulation between the cable cores at a distance of 1.5-2 cm from the edge of the cable, pass the wire through and twist it with pliers. To avoid any protruding parts, remove the end of the steel conductor and wrap the cable-conductor connection with tape or put on a small piece of heat shrink. This will keep the conductor and cable on the same axis and improve sliding in the pipe. You should not use insulating tape; it will increase friction for the cable inside the tube and make it difficult to pass through. Next, we choose one of two methods: 1. We fix the steel conductor (for example, to a nail driven into the wall), and pull the corrugated tube onto the cable like a stocking. First lay out the cable in a straight line, avoiding twisting. 2. We secure the edge of the corrugated tube, and, pulling the conductor, pull the cable into the tube. On both sides of the tube we leave a cable reserve (up to 30 cm) for installation in distribution boxes and switchboards. On the longest section, we embed the cable into the lamp so that the edge of the corrugated tube fits into the gland-cuff. If the diameter of the tube is larger than the diameter of the cuff, then secure the connection with insulating tape. We collect the lines of the remaining lamps. We install the lamps with the cable connected, and secure the corrugated tube in the clips to the junction in the junction box. We pass the cable from the luminaire farthest from the box through the distribution box and cut the tube so that the edge of the corrugation remains in the cuff of the box. We release the main cable in a 10 cm loop. We cut the top of the loop (carefully, trying not to damage the insulation), unravel the cable and remove the insulation from the cores by about 1 cm. We bend it and crimp it with pliers. Thus, we get an unbroken train and avoid unnecessary joints. We connect the outlet from the next lamp to the formed terminals of the main cable, and connect them using a terminal block with a screw clamp. There are other connection methods (soldering, twisting), but the block is both simpler and more convenient. Having connected all the lamps, we fix the corrugated tube in the clips. Next, we install the sockets, switch and panel in the same way.

How to insert the wire into the corrugation. How to route a cable through a corrugated pipe

How to stretch a corrugated cable: video with instructions

Corrugated cable installation is most often carried out when conducting electrical wiring under drywall, as well as in a floor screed. Less commonly, self-extinguishing corrugated pipes are used during electrical installation work in a wooden house. It will be quite problematic for a person without experience to thread the conductor, because... its end may cling to the inner walls of the corrugated pipe. In fact, the pulling technology is not anything complicated, so if you don’t know how to pull a corrugated cable, we recommend that you read the instructions below.

Installation technology

To make the information easier to understand, we will present it step by step:

Measure with a tape measure and cut the required amount of corrugated pipe. It is best to cut with a stationery knife. Be careful - there is a wire inside the pipe. You need to cut it with side cutters, holding it so that after cutting the wire does not sink inside the corrugation. If this happens, you can only get the broach by cutting the pipe to the required length. The end of the wire must be connected to the cable. The easiest way to do this is to carefully bend the string with a hook and break through the edge of the insulation (the video below clearly shows this technology). An alternative method is to simply wrap the string around the cable several times. After this, it is necessary to insulate the connection point so that the protrusions do not cling when pulling the conductor. The free end of the broach must be securely fixed. If you are working together with a partner, he just needs to hold the wire. If you do the electrical installation yourself, you can attach the broach to a battery, door handle or other stationary object. The purpose of the fastening is to create tension in the future to make it more convenient to pull the cable through the corrugation. The last thing left is to tighten the wire all the way in.

This must be done carefully; if you overdo it with tension, a break may occur at the junction of the broach and the cable, which will create a lot of trouble.

Overview of the entire event

That's actually the whole installation technology. As you can see, pulling a wire or cable through a corrugated pipe is not entirely difficult. The last thing left is to secure the corrugation to the clips. However, we provided the most successful situation. There are more complex cases when stretching a conductor is quite problematic, for example, if there is no broach. Below we will consider all force majeure situations.

Non-standard cases

The first and most common situation is when the string is pulled away from the conductor due to strong tension. In this case, it is recommended to cut off the part of the corrugation that has already been threaded and leave it, then reconnect the wire to the end of the cable and finish pulling. The two pieces of corrugated pipe are then connected with electrical tape.

Pulling the wire through the corrugation, if there is no broach, is also not difficult. It is enough to simply bend the end of the conductor 180° so that it does not cling inside the pipe, and then push the product through the entire required length. This technology is clearly demonstrated in the video below:

How to start a wire without a probe

If you have little space in your apartment and you need to thread a long section of corrugated pipe yourself, for example, 30 meters, it is not always possible to do this in a room without experience. In this case, it is recommended to first connect the cable to the string, then go out into the entrance and secure the free end of the wire to the railing on the top floor. After this, stretch the corrugation until the problem is solved. We also recommend visually viewing this process in the video tutorial:

How to cope alone

https://youtube.com/watch?v=wgi4VgQzgpw

Sometimes it becomes necessary to stretch a conductor in a corrugated hose along the ceiling, or rather inside a suspended plasterboard structure. This is quite difficult to do, because... if the sheets are already sewn up, installation must be done through grooves under the lamps. In this case, running a corrugated pipe through the ceiling will help

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Corrugated cable installation

So that you can easily perceive our information, we have tried to present it to your attention step by step:

• Before starting installation, measure the required amount of corrugated pipe. It is better to cut it with a stationery knife. When cutting, remember that there is wire inside the pipe and therefore you should be careful. You can cut the wire using side cutters, just do everything carefully.
• Now you will need to connect the end of your wire to the cable. This is quite simple to do and you just need to bend the string with a hook and use it to break through the edge of the insulation. There is also an alternative way to do it, which requires wrapping the string around the cable several times, after which the connection can simply be insulated. Thanks to this, the cable protrusions will not cling to the ribs of the corrugated pipe.

• The free end of the broach must be securely fixed. If you work with a partner, then he can hold the wire. If you do the work yourself, then the free end can simply be secured to the battery. The purpose of the fastening is to subsequently create tension that will allow the cable to be pulled through.

The last step is that you need to stretch the wire through the entire corrugated pipe. This must be done carefully, because if the tension is too great, then it may break and this will create a lot of trouble.

This is all the technology for proper installation. As you can see, pulling a wire or cable through a corrugated pipe is quite simple. After this stage, you will only need to secure the corrugated pipe in special clips. You may also encounter situations where pulling a cable through a corrugated pipe will be problematic. This usually occurs when there is no tension.

Application areas of corrugated pipe

Wiring in a corrugated pipe is most often used when it is necessary to protect the cable from environmental influences: moisture or temperature. Basically, corrugation can be found in the power supply of a private wooden house, as well as in the construction of industrial facilities, frame buildings and other non-permanent buildings. The corrugated pipe is both a load-bearing channel and a protective element, so its installation is especially relevant when you want to save on materials.

Electric line in the ground

Corrugation is also often used when laying cables in the ground. Plastic does not corrode, so when building an electrical line in the ground, the wires are pulled in a corrugated hose, which provides additional protection for the entire structure. In addition, when turning the trench, due to the flexibility of the material, the presence of right angles is eliminated: all bends will be smooth, which eliminates additional load on the supporting cable.

In addition, if it becomes necessary to replace the entire line, there will be no need to violate the integrity of the soil, since you can pull out the used wire and install a cable replacing it on the spot. To do this, a steel wire or flexible cord is tied to the old line, then the entire line is pulled out at one end, while the cable remains inside. After which, using a cable or cord, a new wire is pulled through the entire length of the corrugation.

Important! You should not make sudden movements, especially when turning, otherwise the wire may cut through the channel, which will not allow the cable to move further. It is worth considering that plastic corrugation has a significant drawback

When exposed to ultraviolet radiation and direct sunlight, the product becomes rigid and brittle, loses flexibility, and therefore may break or crack during mechanical stress. In this regard, if it is necessary to lay wiring along the outer wall of a building, it is better to use a metal corrugated pipe

It is worth considering that plastic corrugation has a significant drawback. When exposed to ultraviolet radiation and direct sunlight, the product becomes rigid and brittle, loses flexibility, and therefore may break or crack during mechanical stress. In this regard, if it is necessary to lay wiring along the outer wall of a building, it is better to use a metal corrugated pipe.

Thus, for the correct organization of power supply indoors or outdoors, it is necessary to strictly follow all the manufacturer’s recommendations and not violate the general rules of construction, as well as the rules for the installation and operation of power plants. If you do not have sufficient knowledge and experience in this area, then it is better to turn to qualified specialists.

Corrugated cable laying: types of flexible products

At the moment, protective polymer sleeve is produced for various construction needs, including sewer corrugation and protection for cables of different voltages. Depending on the properties of the polymer and the size of the cable corrugation, experts recommend using it for different types of wiring:

• for power cable;
• for low-current networks (telephones, television and computer UTP wires).

The protective corrugation, in accordance with its purpose, is produced not only in polymer, but also in metal versions. Flexible pipe products differ in material, color and design (for example, there is a double corrugation). A cable is pulled inside the product, often even more than one - it all depends on the operating conditions and type of wiring:

hidden internal;

Corrugated pipes vary in material, size and other technical characteristics

• external;
• underground.

There is another type of classification of products - according to the degree of strength:

• light pipes;
• heavy;
• super heavy.

The corrugation differs in strength: light, heavy and extra heavy.

Lightweight corrugation is used for hidden installation inside a building (ultraviolet sensitive). Heavy and dense corrugated products are produced for laying underground (they are characterized by increased resistance to pressure).

To make it easier to determine the purpose, a conventional color designation is used, which is reflected in the table:

This is a general industrial construction standard, but it is not always adhered to, especially if there is a small stock of product in coils after a large amount of work.

How to insert a cable into a corrugated cable

Work on laying cables in a corrugated tube should be carried out by a team consisting of at least two people. This is due to the features of the following algorithm of actions, which explains how to correctly pull the wire through the corrugation.

First, you need to remove the end of the wire from the structure and connect it to the cable being mounted. To do this, make a hole in the wire winding, insert the wire into it and secure it securely by carefully twisting it. Next, you need to level the corrugation along its entire length and you can start pulling the cable. One worker must hold the edge of the corrugated pipe from which the wire is inserted, and the second must pull out the steel wire from the other side, thus pushing the cable into the corrugation.

Often the conductor gets stuck inside the corrugated pipe; this situation arises due to weakening of its tension or the appearance of bends, so the condition of the corrugation should be monitored until the end of the pulling process. A fully extended cable should be fixed by tightly wrapping it to the pipe, this is done in order to avoid movement of parts of the structure relative to each other.

It is worth noting that there are corrugated pipes on sale that are not equipped with a steel probe; the price of such products is much lower, but pulling cables through them is not a simple, labor-intensive task. In these cases, one worker must push the cable, and the rest must ensure its progress by deforming the corrugated pipe at the location of the end of the cable.