When carrying out rigging, installation and construction works often there is a need to fix and lengthen the used steel ropes, as well as creating loops and eyes at their ends. For these purposes, rope clamps (rope clamps) are used.
A rope clamp is a device used to fix and secure a steel rope.
This type of rigging is not intended for work related to lifting, moving, holding on weight and lowering loads. Its main purpose is to ensure a strong tension of ropes and cables during the installation of structures and fixing objects in a fixed position, for example, on a platform vehicle during transportation.
Clamps (rope clamps) are used in conjunction with a pear-shaped asymmetrical thimble to fix the rope in the device for joining the rope.
The size of the steel cable clamp is determined by the diameter of the cable used.
Types of rope clamps
There are clamps for ropes and cables of the following types:
1) U-clamp
The clamp is a threaded u-bolt. The threaded ends of the bolt are inserted into the clamping element. When tightening the nuts of the steel clamp, the element presses the cable against the bolt.
2) Flat cable clamp
Made from carbon steel. Consists of clamping element, clamping plate, screws and nuts with metric thread. Depending on the number of screws in the design, the flat cable clamp is single (simplex), double (duplex) and triple (triplex). Tightening the nuts clamps the cable between the plates.
3) Tubular clamp
Aluminum clamps-sleeves are used for ordinary cables, copper - for acid-resistant, for work in aggressive environments stainless steel clamps are used. The tubular clamp is an aluminum flattened hollow cylinder.
Recommended for connecting cables to each other, as well as for making loops at the ends of the cable. Tubular clamps for steel ropes are compressed using a press or hand pliers. They are one-time non-removable elements.
Depending on the design and installation method, metal cable clamps are divided into:
- wedge
- bolted
- screw
- wedged
- pressed
- canine
All rope clamps are manufactured in accordance with DIN and GOST. In lifting devices, for the purpose of connecting the ends of the ropes, it is recommended to use DIN 1142 arcuate clamps. The DIN 741 rope clamp has a lower strength compared to DIN 1142, therefore it is recommended for use in work not related to moving and lifting loads.
Types of materials and coatings
Most often, cable clamps are used in work with big weights and heavy loads, therefore, strict quality control standards are applied during their production. Clamps for steel cables are made exclusively from high quality and durable materials: steel, copper, aluminum, stainless steel.
In addition, rope clamps can be galvanized. Galvanized clamps have additional protection against corrosion. When working in adverse weather conditions and aggressive environments, stainless steel cable clamps are used.
Installation of clamps on the ropes and fastening
When using arcuate clamps, it is recommended to install at least three clamps on one rope. If the load is higher than these types of clamps can withstand, then you need to use a different type of this latch, and not increase their number.
The rope clamp is mounted on steel rope so that the clamp web is always on the load-bearing side of the rope. A U-shaped clamp bolt is located on the tail of the rope or cable. The long part of the cable is bent so that the minimum required number of clamps can be positioned to create a strong loop. The distance between the clamps and the length of the free end of the rope from the last clamp must be at least 6 rope diameters.
Operating rules
Before starting work, it is necessary to check the strength of the rope fastening with clamps. After the first load has been applied to the cable, the tightening torque must be checked again and adjusted if necessary. Products need to be checked and tested regularly. This is necessary due to the fact that during operation the products are subject to wear and overload, which will lead to deformations and changes in the structure of the material. Rope end clamps should be inspected at least once every six months, and even more frequently if products are used under severe working conditions.
It is not allowed to bend or correct the shape of the clamp, as this will lead to a deterioration in the quality of the product and a decrease in its ultimate strength.
The tightness of the clamps on the cable can be adversely affected by the following factors:
- the nut sits tightly on the thread, but not tightly in relation to the jumper;
- the thread is clogged with dirt, oil, corrosion products that prevent the proper tightening of the nut.
Before choosing a certain product, you need to make sure of its quality. To do this, pay attention to the following points:
- clamps must be legibly marked;
- there should be no visible burrs, cracks, grooves and other manufacturing defects on the surface;
- clamps must be selected according to the characteristics of the ropes used;
- the type of material/coating of the clamp must be suitable for the external factors and conditions in which the work is performed.
All these types of rope clamps are designed and manufactured to order by GPO-Snab. You can pick up and order them in our catalog of rigging products.
There are situations during electrification when you need to conduct electricity in a separate room. At the same time, it is not possible to lay a cable in a trench, due to the complexity of the terrain or architecture. Therefore, along with such types of outdoor laying as trays, cable channels, pipes, corrugations, fastening to the wall, there is such a type of laying as cable wiring. In this article, we will consider the technology of mounting a cable on a cable with our own hands.
Application area
According to this method, it is applicable for networks up to 1000 volts. Most often, cable wiring is used in places where the organization of overhead lines does not make sense, but it is enough to throw the cable attached to the cable, and this will be enough to electrify the object.
In this way, lighting networks and electrical wiring for sockets are carried out in warehouses, power cables in production shops, as well as between two separate buildings.
For a home master, this wiring method is of particular interest. All because with the help of simple technology it is possible to electrify outbuildings in the country. Thanks to the cable wiring, it is possible to conduct light from the house to the bathhouse, garage, barn, gazebo and other spaced at some distance along personal plot buildings and lighting fixtures.
Preparatory work
First you need to decide on the wire and its cross section. About that, we talked about in the corresponding article. After that, you need to measure the length, taking into account the entire route of wiring from the machine to the distribution panel. When choosing a cable and suspension elements, it is necessary to take into account the weight of the wire in this area, with a threefold margin of safety. Since in difficult weather conditions the load on suspended structure increases, can cause a break and blackout. Basically, a galvanized steel cable with a diameter of 4.6 to 6.8 mm is used. In cases where the length of the suspension is small, and the weight is such that it can be neglected, instead of cable wiring you can use a string (galvanized steel wire is pulled or varnished hot-rolled wire from 5 to 10 mm).
Mounting technology
First you need to fix on the selected section of the anchor and the fastening elements of the cable wiring. For the most part, these are steel plates pulled together on both sides of the wall with studs, and rings welded to them for hanging the cable. Fastening tension is done to strengthen and avoid their falling out, distributing the weight of the load evenly along the wall, and not at the fastening points.
The suspension height should not be less than 2.75 meters above the pedestrian area, and at least 6 meters above the road. All norms of overhead electrical wiring, including the distance between the supports, are indicated in the diagram:
After mounting the strings, they begin to tie the cable with a bandage. To hang cable wiring on the street, you can use plastic clamps, galvanized iron strips, galvanized knitting wire. The distance between the bandage is 50-80 cm.
When using a binding wire, it is necessary to prevent the core from cutting into the insulation; for this, a gasket is made between the bandage and the wire of insulating material. The winding area of the bandage should be distributed as much as possible by laying 7-10 turns of the bandage. When using plastic clamps, check their performance data. Otherwise, in winter in frost or very hot summer, you will find crumbled clamps.
When laying the cable outside along the cable, it is also necessary to protect the line from the effects of the environment on the insulation, so it is recommended to stretch it in the corrugation, as shown in the photo below. This will then reduce the cost of operation and restoration of cable wiring.
With a short span or the absence of the possibility of attaching a cable to the cable at the installation site, it is possible to assemble the suspension on the ground. An already prepared structure can be stretched and attached.
Following our instructions, you can independently conduct electrical wiring to separate buildings in the country. We also recommend watching a useful video that shows how to make a loop on a cable with your own hands:
Rope preparation
That's all I wanted to tell you about how to install cable wiring with your own hands. As you can see, laying a cable along a cable is a rather laborious undertaking, but still a home master can do it!
To connect the ends of a cable or rope, as well as to form loops at the ends, various types of steel, copper or aluminum clamps are used. Relating to rigging fasteners, cable clamps are used in the elevator industry, when carrying out various installation work as well as at home.
Types of clamps
To ensure durability and reliability, all structural elements clamps are made of stainless steel, and for light operating loads - also made of copper, brass or aluminum.
The most popular are:
Features of using different types of cable clamps
Main technical parameters The products under consideration are the limiting cable diameter and the guaranteed clamping force. The dimensions of the clamp are also important, since it is recommended, regardless of type, to use several clamps in series (at least three), especially if the mass of the load does not guarantee its safe movement or lifting.
Clamps according to DIN 741 are used for ropes with a diameter of 5 ... 62 mm, in the presence of a spring washer in accordance with GOST 6402-70 and a nut in accordance with GOST 5915-70. The design of such a clamp provides for the possibility of installing a locking bar, which provides a more reliable clamping of the cable to the bracket. The clamping block must be made by stamping from steel grade not lower than St.3kp in accordance with GOST 380-94 (only for small clamping force cast pads made of steel 25L are allowed according to GOST 977-75). It is not allowed to use cable clamps, the parts of which do not have a protective anti-corrosion coating from zinc.
AT fasteners flat clamps should be threaded according to GOST 24705-81. The lining material is St.3 steel, the plates should be used for fastening cables with a diameter of 4.6 ... 30 mm.
In the case of successive use of several clamps, the distance between them should not be less than six cable diameters.
In Duplex type double clamps, the shear force is absorbed exclusively by the bolted connection, so the choice of fastener diameter is determined by the diameter of the cable. The following ratios are recommended:
- For a cable with a diameter of 2 mm and 3 mm - M4 fasteners;
- For a cable with a diameter of 4 mm and 5 mm - fasteners M5;
- For a cable with a diameter of 6 mm - fasteners M6;
- For a cable with a diameter of 8 mm - fasteners M8;
- For a cable with a diameter of 10 ... 12 mm - M10 fasteners.
Wedge clamps are not recommended for lifting loads. Because the operational loads on the fasteners are reduced, since the axes of the forces during the operation of such a clamp coincide, and, therefore, shear stresses do not occur. Operating parameters wedge-type clamps are regulated by DIN 15315. For helical clamping of a cable or rope to the supporting surface of the wedge, high-strength fasteners are used (strength class not lower than 5.6), with a protective anti-friction coating. Periodically, the connection needs to be tightened.
The barrel clamp is often made of aluminum and is not designed for large diameters cable: the rational range of diameters is 2 ... 8 mm. The absence of protruding elements and the compactness of such a clamp allows it to be used in confined spaces.
Is it possible to make a cable clamp with your own hands?
The price of clamps, depending on their size and permissible load capacity, is, rub / piece:
- For Simplex clamps - 4 ... 14;
- For Duplex clamps – 7…24;
- For clamps according to DIN 741 - 4…160;
- For wedge clamps – 200…250;
- For barrel clamps - 3 ... 40 (aluminum), and 60 ... 160 (stainless steel).
In everyday life (for example, for motorists), there is often a need to manufacture cable clamp with your own hands. To form a reliable loop, it is advisable to use an ordinary aluminum (not duralumin!) tube, inside which a cable of the desired diameter should freely enter. The tube is bent in an arc, after which a cable is inserted there at a distance of 120 ... 150 mm, its ends are covered with brackets, and connected with a bolt.
When building up parts of the cable, the diameter of the pipe is chosen so that both cables freely enter there, and from different ends. All other actions are performed in a similar way. It should be noted that load bearing capacity of such a cable clamp will be determined by the bending strength of the pipe material, therefore the allowable force homemade device clamp will be noticeably lower than that made by a specialized company.
We can safely say that almost everyone has seen this useful device like a cable tensioner. Many even know how to use this device. However, few people know that this device has a name - it is a lanyard. This word was coined by professional riggers. In our article we will talk about lanyards, their key features as well as tips for proper use.
Application of lanyards - where they are used
This type of tensioners has found wide application in the field of cargo and shipping. To date, it is impossible to imagine any heavy or oversized cargo that would be fastened without the help of lanyards. Due to the special design, the device has the ability to cope with very heavy loads, the mass of which reaches several tens of tons. Initially, craftsmen used a mechanism to connect metal and wooden structures different types and types.
The lanyard is a device that is ideal for securing loads during rigging, as well as transporting goods. For example, the mechanism will be indispensable in cases where it is required to install bulky antennas or metal structures.
Modern lanyards are made from high quality stainless steel. Due to this, the mechanisms are resistant to the destructive effects of corrosion. For amplification performance characteristics, as well as to increase the level of reliability, strength and durability of the device, they are often coated with various coatings. Galvanized lanyards are very popular, the cost of which is slightly higher. average price to similar devices.
At the same time, the cost is fully justified. The bottom line is that metal cable tensioners are usually used to secure loads from the outside, under open sky. Therefore, they are subject to environment. If you purchase a tool coated with zinc, then about the problems associated with deformation or destruction due to the action precipitation, you can forget forever.
When buying cable tensioners, first of all, attention should be paid to the thickness and length of the ropes and cables that require a turnbuckle to work with. Despite the fact that they are able to withstand the enormous loads created by multi-ton objects, the parameters of the lanyards themselves are compact. So, the sizes are in the range from several to tens of centimeters. By choosing the right mounting tensioner for cables, you can count on the successful fixing of the necessary objects.
Lanyard from the inside - how it works
Outwardly, the lanyard resembles a conventional clutch, which consists of several screws. The peculiarity lies in the fact that the threads with the opposite course are applied on the screws. Another important element of any lanyard is the metal base on which the screws are screwed. Usually the base is different. cylindrical shape. However, bases are not always used. More simple and primitive models are equipped with special rings. Naturally, the metal base provides greater strength and reliability of the device. In any case, the operation of the mechanism is carried out by tightening the screws closer to the center. The result is maximum tension in cables, ropes, belts or ropes, depending on what exactly is being pulled together by a turnbuckle.
Cargo transportation and rigging is far from the only scope of tensioners. For example, turnbuckles can be used in everyday life, in particular, for piano tuning (stringing the strings to achieve a better sound), as well as, if necessary, tightening curtain fasteners.
In most cases, cable devices are made open, that is, the screws for adjusting the tension force are in sight. The body can be made by casting, welding or forging. Next stage technological process consists in milling two holes, through which you can change the force and length. Regardless of the method of production of each specific part that is part of the tensioner, the device itself is made by turning.
The design of any lanyard is represented by the following main components:
- metal case
- Two screws with opposite threads
- The head of a screw, which is made in the form of a ring, hook or fork.
It should be noted that there are also models with closed type screws that are required to ensure additional protection transported goods, because you have to spend large quantity time to loosen the screws. In addition, closed turnbuckles are in demand when working with heavy huge objects in difficult weather conditions.
Lanyards for ropes - their main types
When buying a lanyard for stretching cables, you must decide on its marking, as well as the features of each particular model. There are several types of devices for fastening goods:
- 1. O + O - rings are located on each head of the screw
- 2. C + O - there is a ring and a hook on the heads
- 3. С+С - the lanyard is presented in a configuration with two hooks
- 4. B + B - there are plugs on the screws
These are the most popular models, which are on this moment presented on the market. To increase or decrease the tension, it is necessary to rotate the screws, as a result of which they will move either from the center or towards the central part of the device. In the first case, the tension force will decrease, while the movement of the screws towards the center indicates an increase in the cable tension force. There are reinforced models called cargo turnbuckles. A feature of such devices is strong and durable steel, capable of withstanding huge loads. Thus, cargo mechanisms weighing about 25 kilograms ensure the fastening of objects with total weight up to 90 tons.
To increase the tension, you need to turn the screws
We also note that hook-hook turnbuckles have found application in cases where the load is attached to durable products like antennas, masts, as well as cables or ropes. If you purchased a ring-to-ring type device, then a hook-shaped object is required to secure such a lanyard. Otherwise, the O-shaped tensioner cannot be fixed. The moving elements of such mechanisms have a special thread that is necessary to adjust and change the length of the cable. AT modern appliances additional devices appear, the task of which is to change the level of tension smoothness. The scope of such devices is the pulling of fiber-optic cables under small loads.
When working with lanyards of the above varieties, one should take into account the fact that their use is strictly prohibited for fixing load-bearing structures. In this case, the "fork-fork" option on the screw heads can help. A very popular and demanded version of the tensioners. Through such a device, riggers get the opportunity to as soon as possible adjust the length of the cable and the level of its tension. However, this tool is not suitable for lifting objects. Its main purpose is to belay, stretch, and also tune the suspension.
In some situations, chain turnbuckles are used, which boast a significantly longer length. Thanks to this feature, the tool can be used to grab two or even more objects in order to pull them together, setting a certain level of tension.
Proper operation of lanyards - what is the secret of successful work
It is necessary to subject the lanyard for the cable only to such loads for which it is designed. In the event of any deformation individual elements due to increased loads, it is necessary to immediately respond to what is happening: reduce the level of cable tension and replace components that have failed. Moreover, such actions must be carried out with the utmost care and attention in order to tight rope did not destroy the mechanism and did not harm you.
Radial or side loads, significantly reduce the life of devices, since turnbuckles are not intended for testing such loads. In this regard, constant monitoring of the tool before work, during and always after is required. Any, even the smallest and seemingly insignificant deformations at first glance, are unacceptable. By choosing the right device for handling loads of the appropriate dimensions and weight, you will minimize the likelihood of device failure.
- Lubrication
- Felt polishing
- Flushing with gasoline
- Tool run dry
One of the most common problems with tensioners is a tightly stuck turnbuckle, the screws of which can be incredibly difficult to unscrew even for physically developed men. To avoid such problems, it is necessary to use special lubricants, including those with the addition of molybdenum bisulfate or graphite, and also periodically rinse the device in clean fresh water.
As you can see, the lanyard is an excellent tool for performing complex work related to the transportation of heavy loads, as well as their fastening. BUT proper care ensures long and trouble-free operation of the mechanism.
By various reasons it is not always possible to spend underground electrical cable to an object that needs to be supplied with electricity. In such cases, the technology of laying cables or individual wires through the air on a cable is successfully used. In the article, we will consider how the cable is installed and laid on a cable to the house, garage, what types of fastening are used.
Scope of technology
Such technologies are used only in electrical networks with a voltage not exceeding 1000 volts, PUE requirement chapter 2.1. In most cases, stretching cables are used from buildings or power lines to individual structures over short distances. Where the installation of power transmission towers or digging trenches for cable is not possible due to specifications production during the operation of facilities, or unjustifiably in terms of the volume of work performed, is expensive from a financial point of view.
In production workshops, warehouses, facilities with large areas, high ceilings, for lighting the best option is the use of these technologies. Cable extensions are used for electric networks of street lighting of certain territories.
For owners of a private house, this wiring method allows you to get rid of the laborious work of digging a trench. It is easier to stretch the cable through the air from the switchboard in the house to the outbuildings:
- workshop;
- summer kitchen;
- gazebo with barbecue;
- chicken coop;
- bathhouse and other possible facilities in the yard of a private household.
Cable wiring allows you to run light three-wire wires for electrical consumers without high power and cables with wires large section for power supply household appliances. Before proceeding with the installation of cable wiring, preliminary calculations are required.
Preliminary measures before installation
At the first stage, it is necessary to determine how much power will be consumed by electrical appliances in the facilities that are planned to be provided with electricity. Based on the power consumption, the cross section of the cable wires is calculated, its length and weight are taken into account. These parameters determine which fasteners to use, the diameter and material of the cable. To calculate the power consumption and cable cross-section, a more detailed study of a separate topic is required. In simplified form, it looks like this:
- The power of all electrical appliances is summed up, which are supposed to be used in the calculated network. The power on each device is indicated in the passports for the products or nameplates on the case. The simplest example of a lighting lamp is always written 40 on them; 60; 75 or 100 or more watts.
∑Р = P1 + P2 +…Pn = 3.7 kW. (3700 W) - Total power.
- Determine the maximum possible current in the circuit
I \u003d ∑P / U \u003d 3700 W / 220 V \u003d 16.8 A. - Maximum current.
U is the mains voltage.
- To determine the cross section of wires in a cable, we use the table
In our case, we choose the value of the maximum current a little more than 19A, taking into account that additional Appliances. According to the table, we get a power of 4.1 kW, which corresponds to a copper wire cross section of 1.5 mm. It must be understood that the cross section is not a diameter, it is calculated by the formula:
Experienced electricians are well aware of the standards of cables, wires and determine the cross section by eye. For ordinary consumers, there are tables for determining the cross-section by diameter, it is enough to measure the diameter of the wire with a micrometer or caliper and determine its cross section from the table.
- Next stage preliminary work, cable length measurement from the switchboard in the house to the switchgear (switchgear) on the building to which the cable structure is extended. This can be done with a regular tape measure,
Tip #1. Be sure to take into account the cable margin for cutting and connecting to the switchboard, add about 30 cm from both ends.
Choice of cable diameter and material
Determine the weight of the cable and other elements that will be attached to it. If the distance between support mounts 5-6 m and the weight of the wire is not significant, it is possible to stretch galvanized steel wire with a diameter of 2-3 mm. When the distance is more than 10 m, the cable is heavy, especially if the cable structure is used with lighting elements, a galvanized steel cable with Ø 4-6.5 mm is used. Such a cable will withstand any cable with a wire cross section of up to 10 mm / sq., more is not used in private households, due to the limitation of power consumption. You can hang up to 5 pieces on such a cable. lighting lanterns in a lightweight housing.
The cable can be wound and weighed on conventional scales, or calculated, knowing its brand according to the characteristics table that is attached with the sale. The weight of the cable is indicated per 1 m, it is necessary to multiply the indicated weight by the number of meters, you will get total weight piece, which is used for fastening on a steel cable.
For living conditions in order not to spend money, you can hang the cable that was used for concealed wiring. In order for the insulation to last longer, lay it in a corrugated pipe, its weight is not significant. There are reference tables indicating the brand and weight of the cable. You can look it up on the Internet, some sites have calculators for calculating the length and mass of wires and cables.
Tip #2 Use the calculator on this sitehttp://kabelves.ru/
Table indicating the brand of cable and weight in kg. by 1 meter For high current loads, it is better to use special cables for cable air structures:
- AWT, AVTS, APT already have a built-in load-bearing steel cable;
- AVRG, ANRG, APVG, AVVG are suspended from a supporting steel cable.
Support and tension elements of cable wiring
These products are installed on the walls of buildings, structures between which stretching is stretched. Depending on the material and diameter of the cable, the fastening design is selected:
- Tension bolt, with hook and tension anchor are used for flexible stranded wire ropes industrial production carrying heavy loads, you can use rolled wire with a diameter of up to 6 mm.
- String anchors with a small diameter are designed for light wires with a cross section of up to 6 mm at a distance of up to 10 meters, without elements lighting fixtures.
- Anchors for industrial cables and wire rod are able to withstand heavy cables and lighting elements at a distance of up to 12 m without additional supports.
- Fasteners for stretching parallel lines are often used for a dual purpose, for power supply of structures and for the placement of lighting lanterns. One cable is laid power cable with a wire cross section of 10 -35 mm / sq., lighting fixtures on the second, junction boxes With copper wire 2.5 - 4 mm.
All these structures have individual characteristics when mounted on the walls of buildings.
Requirements for the installation of end fasteners and installation features
Never fasten the end elements to the decorative cladding of the building and roofing parts. Devices designed for heavy loads are fixed on both sides bearing wall steel plates tightened with through bolts. As shown in the picture for the tension bolt with hook. They should be located above pedestrian walkways at a height of at least 2.7 m, and above traffic lanes at least 6 m. Anchors for strings with a lighter load can be fixed with simple anchor screws on concrete.
Ideally, tension anchors are embedded in the wall during the construction of the buildings according to the project. In practice, this is not always provided for, then you have to drill the walls with a puncher. A metal plate with a bolted contact is attached under the end mount for 20-30 cm to ground the cable. It is connected by a welding joint with a rolled wire with a cross section of at least 16 sq / mm, which goes to a common ground loop. In some cases, grounding is carried out with a separate copper wire with a cross section of at least 2.5 kv / mm bolted connections.
Laying cable on a cable when connecting to a wall Installation and tension of the cable
After installing the terminal fixtures, on the ground the cable is attached to the extension, the lighting fixtures with junction boxes are fixed and connected. Assembled structure is delivered to the installation site and unwound along the entire length from one fixing anchor to another.
The cable length must be at least 2 m longer than the distance between the end anchors. The stock will be needed to seal the mount to the terminal devices and bring the ends to the ground terminals, which are located below the anchors. The end loops of the cable are attached to the tension anchors, after which the tension is regulated by them. The stretching force should be for lightweight structures with cables with a cross section of 4-10 sq. / mm - up to 100 kg. / cm. For heavy cables with a cross section of 16 - 25 sq. / mm - up to 500 kg. / cm. This parameter is measured with a dynamometer, which is installed between the anchor and the brace loop.
After tensioning the cable, the ends of the cable are grounded, the cable is brought to the distribution devices and connected to the protective circuit breakers.
Elements for fastening the cable to the cable
To securely fix the cable with a cable, there are several devices:
The easiest method cable twisting with stretching with ordinary aluminum wireØ 2.5 - 5 mm with insulation. At the connections, after 50 -80 cm, 7-8 turns of wire are made, tight turn to turn. In order for the cable insulation not to be pressed through by the fastening wires, the fastening place is wrapped with a rubber plate, the wire is wound on top. It is recommended to use rubber for gaskets from old car wheel tubes;
The device is attached to the stretch, the cable is laid in the gutter, overlapped with a strap that is threaded into the lock, tightened and securely fixed. The lock is designed so that the strap cannot be pulled out in the opposite direction; to remove it, you can only cut it.
Plates are made with hinges different size. One plate is put on the cable, the other on the cable. In the center of the plates there is a hole with a thread for a bolt, they are combined and tightened with a bolt.
All connections, regardless of design, are installed after 50 - 80 cm.
Junction boxes and cable-mounted lighting fixtures
For fixing the junction boxes, special galvanized iron plates with cut-out shapes are used. A part of the plate is bent from the cut out form, a cable and a box are inserted, after which everything is fixed with folding elements.
Galvanized plates of a special shape are used to fasten lighting fixtures, but the principle of fastening remains the same, as shown in the figure.
- Cable;
- plate;
- Cable;
- Junction box;
- Plafond with lamp holder.
Frequently Asked Questions of Electricians
Question number 1. You can pull the cable, then attach the cable and other elements?
This can be done if the installation conditions on site allow it to be done without compromising safety when working at height. But after that, you will definitely have to increase the stretch, since the load on it will increase.
Question number 2. What wire should be used to connect the fasteners under the anchor to the ground loop?
Depending on your capabilities, rolled wire with a welded joint or copper, preferably with yellow-green insulation, as determined by the PUE. The cross section of the wires must be at least 2.5 kV/mm.
Question number 3. Can a cable be used as a neutral wire?
Yes, as long as it is properly grounded.
Question number 4. Which circuit breaker set for a cable routed along a cable?
The design of the cable outlet in this case does not matter, the circuit breaker is installed based on the maximum load current in this circuit.
Question number 5. Can I hang junction boxes for outdoor wiring?
