Selection of electrical outlets. What sockets to choose for the home? DKC - an individualist in the electrical market

Wiring accessories are an integral part of any electrical network. It is with their participation that the use of electricity is carried out. Therefore, in the process of repair, the question often arises of how to choose sockets and switches for an apartment in order to provide maximum convenience and comfort. There are a lot of selection criteria, but it is recommended to start by studying the varieties of these products.

Design features of sockets and switches

Nearly all switches and outlets are used multiple times throughout the day for extended periods of time. In addition, they are constantly exposed to mains voltage. Therefore, when solving the problem of which sockets and switches to choose, you should pay attention not only to external data, but first of all to ask about their reliability and safety in operation.

The main function of such products is to provide network switching with electrical appliances and lamps. During operation, there is a constant opening or closing of contacts. In sockets, the pins of the plugs are connected to the contact lugs, and in the switches, keys are provided for this purpose. The contacts are constantly heated under the influence of the flowing current. Additional negative influence has an electric arc that occurs at the moment the circuit is broken, which often leads to premature destruction of contact groups.

High-quality products with an optimal design successfully cope with all loads and meet the terms that the manufacturing company sets for 15-20 years. They are not susceptible to overheating, do not allow arcing and are resistant to high temperatures.

When choosing an electrical outlet or switch, you need to check the quality of the main structural components. In sockets, these are contacts made in the form of petals. A strong metal spring is installed at the base, connecting them to each other. If such a spring is absent, then the product is unreliable and will not last long. Therefore, this socket is not suitable for hob electric stove.

For the manufacture of high-quality contacts, a material with good electrical conductivity and corrosion resistance is used. The core of the entire socket is a core, inside of which the petals and terminals are connected. In old sockets, it was ceramic, and now it uses a special electrical plastic that is not subject to overheating and is resistant to mechanical stress.

Varieties of electrical outlets

How to choose an outlet? Usually, sockets are available with or without grounding (Fig. 1), which are selected in accordance with technical conditions... For example, or in bathrooms where powerful equipment is installed, sockets must be grounded, including those used for the hob.

For rooms with high humidity, it is better to choose sockets equipped with covers (Fig. 2). They are installed in swimming pools, bathrooms or outdoors, as is often the case in private homes. A protective cover covers the outlet and is an effective barrier against moisture ingress. In addition, such products have an additional degree of protection.

In many cases, it is much more convenient to use double sockets (Fig. 3), installed in a common back box. When buying, you should pay attention to the quality of the internal elements, since such products are often subjected to double loads.

In children's rooms, sockets are installed, equipped with a special valve or protective curtains (Fig. 4). Thus, the device is protected from childish pranks and opens only under the action of an electric plug. Another type of plug has a push-out function (fig. 5) for easy removal of the plug. The wire is additionally protected from damage, which is especially important with frequent changes of household appliances.

The so-called smart sockets (fig. 6) are equipped with a timer that turns off at a set time. In this case, the plug remains connected to the device, but it turns out to be de-energized.

There are other types of outlets used in low current networks. Antennas, radio points, etc. are connected to them. Some designs are equipped with several connectors at once. In private homes, power outlets can be installed for connecting electric motors, welding and other powerful equipment.

Electrical switches

When solving the problem of how to choose a switch, it should be borne in mind that these devices, like sockets, are presented in a wide range. Most rooms are equipped with conventional appliances. Recently, switching devices equipped with backlighting have become popular. They are installed in the darkest places - corridors, hallways, kitchens, etc.

There are switches with a basic function. They are used in conjunction with conventional incandescent lamps. By the way of switching on, they can be of a mechanical or sensor type. The light level is changed by simply turning the knob. Pass-through switches are designed to control light from different points in the room. They can be equipped with several buttons connected to different lighting groups.

By design type, the switches are divided into one-, two- and three-button devices. All devices, both sockets and switches, are designed for use with hidden and outdoor wiring. The designs of such devices are fundamentally different from each other.

Criterias of choice

Reliable and durable operation of switching devices is based on contacts that provide a connection to the electrical network.

According to their design features contact systems are divided into two main groups:

• Screw. They have been used for a long time and are still in use, including with a ground electrode. They are considered the most reliable, but they require regular pull-ups at least once every 3 months. This is due to the gradual shrinkage of the conductor under the influence of the screw pressure, as a result of which the contact with the network becomes weaker. If you do not pull up, it will gradually burn out due to repeated overheating, especially when using a socket for the hob.
• Quick-clamping. Compared to screw contacts, they have undeniable advantages. After shrinkage, the contacts are independently compressed by means of a spring, periodic tightening is not required. The minimum service life of such systems is 15 years. Ideal for use in apartments and private houses. New outlets have a grounding contact.

The material from which the switching devices are made is of great importance. The strength of the product largely depends on this. The following types of materials are mainly used:

• Metal. Applies to switches only.
• Different kinds heat-resistant and impact-resistant plastics.
• Plastic with rubber properties for waterproof products.

These options are considered the best, providing high quality products. Devices made of them are not destroyed by accidental shock, they are resistant to high temperatures and do not ignite in case of short circuits and other network damage. Anti-vandal products used for outdoor installation and in public places.

The main facing materials are thermoplastic and duroplastic. The first option is highly plastic and is used in most products. The only drawback is the appearance of scratches from any mechanical stress. The second material has higher strength and rigidity. It is not subject to fire, and there are no scratches on its surface. Duroplast is very fragile, but subject to the rules of operation, this drawback is completely invisible.

When decorating the interiors of premises in design solutions are used non-standard materials... The color of the rosettes imitates wood, stone, glass. They are not as safe to operate, therefore they require additional measures and better wiring.

Electrical outlet safety

Compared to switches, sockets carry higher loads and are destructive electric current... In this regard, safety issues during the operation of these devices are in the first place.

First of all, for each device, you need to determine what current and voltage are best for it. For most outlets, select values \u200b\u200bthat correspond to 6A and 250 volts. Before choosing, you must make sure that the degree of protection is suitable for the future location.

The packaging of sockets and switches is marked with an IP code that corresponds to a certain level of protection. It contains two digits. The first digit is in the range from 0 to 6 and the degree of protection from dust and small objects is selected using it:

• 0 - no protection at all.
• 1 - protection against objects over 50 mm in size.
• 3 - the same for items over 12 mm.
• 4 - the same for items over 1-2.5 mm.
• 5 - dust protection.
• 6 - complete protection against dust and objects, regardless of size.

The second number corresponds to the degree of protection against moisture. In this case, the range is 0 to 8:

• 0 - the product is not protected in any way.
• 1 - protection against drops falling vertically.
• 2 - drops fall at an angle of 15 degrees.
• 3 - splashes of moisture at an angle of 60 degrees.
• 4 - splashes of any format other than those listed.
• 5 - light water streams.
• 6 - strong water jet.
• 7 - short-term immersion in water.
• 8 - long stay in the water (full protection).

The most prestigious are products from manufacturers Legrand, Schneider, ABB and others. Their advantages are known to all, it remains only to choose a specific product for certain operating conditions. The high cost is due to the same high quality and durability of these devices.

More economical options for the home are offered by Viko and IEK. They are of quite acceptable quality for a reasonable price. As a rule, these products fulfill the stated service life. Which one to choose, everyone decides for himself.

There are a lot of fake products currently being produced under famous brand names. In order to accurately select the switches of the desired type, you must follow some rules:

• Fake plastic is smelly. Therefore, it is best to sniff such outlets right away.
• Estimate the weight of the device in your hand. The chosen expensive outlet cannot be light, since they are made of high-quality and durable materials with normal thickness. The fakes feel too light, which is noticeable almost immediately when you choose them.
• You need to carefully examine the case. There should be no cracks, and technical clearances are visible in a minimum amount. Original products can be easily disassembled and assembled, and fastened with latches. If the case is fastened with screws or sealed, then this device is counterfeit and can punch to the ground.
• Verify appearance and the state of the contacts of sockets and switches. They are normally golden in color and will not corrode. Darkened metal parts indicate poor quality.

Outlets and switches are essential companions for the convenience of electricity. They are completely different shapes, purpose and configuration. You can choose exactly the product that will best fit into the interior and will best suit the purpose. In addition, a wide range of prices for electrical fittings will allow you to choose what is ideal for your pocket. It will be very easy to do this if you read and follow the suggested purchase rules below.

Both sockets and switches have a wide variety of functions depending on the type of product.

Socket types

Before choosing an outlet, first determine suitable view products, considering that they are of the following types:

• Sockets without grounding. They are used in cases where grounding is not provided or is not required, for example, in residential premises.
  
• Sockets with grounding. Installed in places where it is important to have grounding. Most often, these are a kitchen or a socket for connecting a computer. They are also used in private homes.
• Sockets with a cover. The use of such an outlet is important in rooms with high humidity, such as a bathroom, a boiler room, a swimming pool, and an external outlet on the house. Such products have a special cover that covers the entire area of \u200b\u200bthe outlet and actively prevents the ingress of water or moisture. In addition, it is important to know that sockets for use in wet areas must have a special IP rating.
  
• Twin sockets. They are mounted in a socket box, allowing you to use two connections to the mains at once. The not very reliable mechanics of such an outlet can be unsafe.
  
• Outlets with a protective shutter or valve. Children's rooms are equipped with such sockets to prevent the possibility of sticking something thin there. The openings of such an outlet are covered with a kind of curtain that opens only if you insert an electrical plug into it.
  
• Push-out sockets. Equipped with a special button, by pressing which a person can easily remove the plug from the socket. Protects the wire from damage, are relevant in places where equipment is frequently changed, for example, in the kitchen or in a hairdresser.
  
• Sockets with off timer. The timer function allows you to independently set the operating time of the outlet. It is important to disconnect the network at night or in production at the end of the working day if necessary. Also used in combination with timer-equipped appliances such as air conditioning, electric oven, multicooker or TV.
  
• Special sockets. Designed for antennas, telephones, radio sets, computers, etc. There are both built-in and overhead options. There are also types that combine several connectors at the same time.
  
• Power connectors. Special plug connections, which are mainly used on construction sites to connect especially high power devices, such as a welding machine.
  

Types of switches

To more clearly imagine how to choose a circuit breaker or a manual one, also initially familiarize yourself with the existing varieties provided by modern manufacturers:

Important! All sockets and switches are also divided into two types, depending on the type of wiring:

• outdoor wiring;
• hidden wiring.

When choosing a device, pay attention to this, since they are not interchangeable, and you may have to go to the store to make a replacement, if, when deciding which sockets to choose, you preferred the wrong option.

How to choose a switch by type of design?

As already mentioned, switches can have several design options:

Considering the sockets and switches, which ones to choose, decide based on the criterion of maximum convenience and the features of the network wiring. Also take into account the number of bulbs in the fixture.

How to distinguish quality products from fakes?

To be able to determine the quality of the product yourself, do the following:

Which contact system is best?

There are two types of systems:

Considering all of the above, quick-clamping systems have the following advantages:

Which material is better?

Since the switch and socket are a device that is regularly exposed to mechanical force, it is important to choose a product made of materials of increased strength:

To understand why it is better to give preference to such options, we note some advantages:

Cladding material

As facing material two types are applied:

In addition to products made from the two materials described above, which have a simple design, there are more sophisticated options, but less safe:

Safety indicators

The main indicators that determine the degree of reliability and safety of the device are its technical specifications: voltage and current of precisely calculated strength. These are the characteristics that should be considered in the first place if you yourself cope with the task of how to choose the right outlet.

The main number of outlets is designed for the following conditions:

To determine the level of protection yourself, be sure to find a special IP code on the outlet packaging, which is a conditional indicator. It is indicated by two numbers:

Of course, the higher the IP rating, the better the protection and the more expensive the outlet. Therefore, keep in mind that the standard values \u200b\u200brecommended for different types premises correspond to the following parameters:

Price categories of sockets and switches

There are several price groups of electrical outlets and switches. Each of them has advantages and disadvantages.

What color should you choose?

The color palette of modern products is quite diverse, so it allows you to choose a suitable outlet or switch that will perfectly and very organically fit into the interior with any choice of shades.

The following design options are distinguished in it:

Which manufacturer should you choose?

All manufacturers presented below have already proven themselves in the electrical fittings market. You can find information about each of these brands on the Internet. There is also a full range of products on offer.

Check out several well-known manufacturers to make your purchase choice easier:

Video

Watch the video overview of outlets and switches to get a clear understanding of distinctive features different types.

Conclusion

Installing sockets and switches is the final chord in your renovation. High-quality products will serve you for many years, but it is worth remembering that it is permissible to make the choice on your own, and it is better to trust the installation of such products to professionals. The safety of your home directly depends on this.

The choice of the socket and the switch must be carried out taking into account the specifics of the use of the room, the reputation of the manufacturer of the corresponding equipment and the characteristics of the devices for connection.

The choice of such products can make even a professional electrician ponder: the range on display, presented in a specialized store, is wide and varied. And it is not easy for an ordinary consumer to navigate the criteria and safety requirements for the simplest type of electrical equipment that has to be used daily and repeatedly.

What sockets and switches need to be installed in the apartment

Two common groups that do not leave much choice to a person living in a residential area:

• securely fixed hidden (or internal) sockets;
• as safe as possible, with wires laid in special grooves (overhead or external).

The second group is used exclusively for specific decorative purposes or is recommended by fire safety regulations for installation in wooden rooms. In an apartment, an office or an institution, internal sockets are used, in which only the rim and holes for the plug remain for a visual view.

In fact, everything turns out to be not so simple: you can only decide on the subject of preference if you know your own requirements: for which room the structure is intended, what security measures are necessary, and even what style correspondence is planned to be achieved. Since these are functional devices, for constant operation, they will need reliability and additional gadgets.<

The right choice parameters

Categories of sockets and switches for an apartment are divided into simple and special. Expensive innovations controlled from the Internet, with a special type of grounding, or designed for low-power carriers, with voltage indication and even a special mechanism that allows you to pull the plug without any effort. All this is not a cheap pleasure, but if they are produced by a manufacturer, then there is a demand.

Most of these devices are designed for special cases, for example, with child protection - for installation where there are small children, with protection from dust and moisture - in the bathroom, pull-out - in the kitchen.

For bathroom

The rules of the PUE previously prohibited the installation of a socket and even a switch in the bathroom, in order to avoid electric shock. Even the washing machines had a longer cord length to allow connections outside the room with moisture. There are now sockets with a spring-loaded cover that provide protection against drips and splashes even when the plug is connected. There are overhead waterproof ones - for those who thought about installation too late, but built-in ones are safer, although more effort is needed to install them.

If the outlet is for connecting the washing machine, there must be a copper cable of the appropriate section to it, and if it is also planned to connect the heaters, then the thickness of the outlet cable is increased by at least one and a half times.

Kitchen

The main requirement for sockets in the kitchen is considered to be their verified number and exact location for the appliances used. If you have to stretch an extension cord, it is both unaesthetic and inconvenient. A free socket for a laptop or charging can be simple, or dirt-proof. For a washing machine or electric stove, you will have to purchase with a thick copper cable and allocate a separate line. With a button for free exit, the plug can be installed for a refrigerator or microwave, if its location is behind the appliance and requires effort to reach the right place.

Bedroom and hall

The main criterion for choosing a switch and where to connect the plug in the bedroom and living room is maximum convenience. Most often, the most commonplace is used here - a rocker switch, although complex options can also be used - for example:

• on a push-button timer;
• with automatic shutdown at a specified time;
• a block of several inputs for connecting nightlights and necessary household electrical appliances;
• a key that allows one-touch to provide immediate darkness and silence.

Both in the bedroom and in the hall - the aesthetic component is important. Therefore, attention is paid to the color and decor of the electrical outlet. But in the hall it is better to give preference to the built-in type with a backlight indicator, and in the bedroom - to facilitate pressing asleep with the same indicator light, only with a soft flip-on type button. It is easy and simple to feel it with your hand in the dark, and the characteristic click is heard much quieter.

Living room and corridor

There are no restrictions, except for the correct location and aesthetic component. For both types of electrical devices, the most convenient place is provided, and their number and height are calculated depending on the electrical devices used. A computer and a TV, a home theater and an electric fireplace, shelving lighting, a table lamp or a floor lamp by the armchairs are taken into account. All that is required of the owners of the premises is to ensure the maximum aesthetics of the premises, where outsiders are most often allowed. The socket and switch must correspond to the style solution - be built-in, of a suitable color, and if it works out with a texture, the option will be just perfect.

Veranda and balcony

You can get by with the correct installation of overhead options so as not to mess with electrical wiring, but if the owners intend to do everything at the highest level, it is better to take it with an indicator and dust protection. If children often play on the veranda or balcony, you need to take a model with special protection, and when the owners prefer to work not in an office or bedroom, but on the balcony and equip a workplace there, you should also think about an Internet outlet.

How to choose the best quality and most reliable sockets for the Internet

The correct choice of such an outlet is made according to the type of cable used by the provider. Twisted pair is determined by the baud rate and the best choice of special device for connection would be Category 5 and 6 products, for example, RJ-45. If the supermarket does not have a consultant for this category, or he is poorly informed about the type of product for connecting the Internet, it is better to consult with the person who is involved in this area.

How to distinguish a fake

An absolutely simple process, even in appearance. If there is no special marking, or it is somehow stuck, plastic products are characterized by roughness and a pungent smell, uneven or uneven gaps between the constituent segments are already a sign of falsification. You can take a closer look at the material of manufacture and contacts (they should not be wrinkled and made of thin metal).

TOP popular brands: what to take

The recommendations from the professionals involved in the installation of electrical wiring of equipment from Legrand, SchneiderElectric, Polo, ABB, Jung are excellent, and preference is given in the sequence listed. The largest number of approving reviews was collected by Legrand: buyers note the original design, the quality of materials of manufacture, the multifunctionality of the device and long, problem-free operation.

Best inexpensive sockets and switches

In a relatively inexpensive price segment, you can pay attention to the products of Chinese and Turkish manufacturers, about which there are many positive reviews: Makel, Viko, Bticino, Wessen, Lezard.

The use of a non-standard option is justified in rooms of specialized purpose, and the simplest ones are suitable for a room and bedroom. Sometimes people deliberately buy the most expensive in order to guarantee themselves a quality item with long-term use.

Useful video

If with constructive it is clear (the socket is embedded - we put a hidden one, it is not in the wall - we go behind the outer one), then less noticeable details require attention. First of all, we look at contacts - two stamped brass plates, as is done on cheap sockets, are suitable only for low-current loads, even if the outlet is proudly written "16 A". The fact is that such contacts spark and burn (turn on a powerful switching power supply - you will see for yourself), loosen with frequent switching, and therefore begin to spark and burn even more. Full-size spring-loaded contacts are the only true choice for frequently used outlet, high power consumers. Expensive? But we also buy an outlet for years, not weeks.

If there are children at home, or at least planned, choose sockets with protective shutterscovering the holes. Moreover, the curtains should open exactly when you simultaneously press both, when the plug is inserted, and not one by one. You didn’t stick nails in a socket as a child? The author has had it. True, it was not a nail, but a wire, but I still remember it, and even, it seems, prompted me to choose my specialty. The same curtains will be useful, for example, in the kitchen - some kind of protection against splashes, but in such conditions, of course, a full-fledged lid is definitely better.

Mechanical strength it will not be superfluous for sure. No, we, of course, all know that you can't just pull the cord out of the outlet without holding it with your hand, and so on, and so on - but in practice, for some reason, that's how we break them, isn't it? Therefore, the fastening itself in the socket, and the fastening of the frame must be solid.

Happy shopping!

When repairing and replacing electrical wiring in your home, always try to choose modern solutions. As a rule, they already take into account all the identified shortcomings of the previous series of wiring products.

Therefore, when buying new sockets and switches, you can and should choose exactly those that already today have several characteristic differences from the previous traditional ones.

This, of course, does not mean that the old sockets are bad, but the engineering thought of the manufacturers does not stand still and you need to use all the advantages of innovation in your apartment. Let's compare how modern sockets and switches differ from previous budget models.

The new sockets have two layers:

• pad - polycarbonate

What are the benefits of this? Polycarbonate provides additional electrical safety.

Even if somehow the phase from the wiring broke through to the socket housing, the front of the caliper will be reliably isolated. And touching it with your fingers will not shock you.

But often, many electricians untwist and disassemble sockets to find a malfunction, without even removing the voltage from it. This function will very well protect against accidental electric shock.

Moreover, the presence of two layers allows to increase the strength of the entire structure by about 50% in front of the traditional galvanized steel support.

The front panel is fastened with latches. To dismantle and install it back, it takes no more than 3 seconds.

Just pry it on the side with a screwdriver and pull it out with your fingers.

There is even a designation in which places you need to pry with a screwdriver.

In the same way, put it in place, pressing and snapping into the attachment points.

True, if a fake comes across, in which the elasticity of the plastic deteriorates over time, these latches from a plus can turn into a minus.

After a couple of years, when dismantling, you can forget how they originally clicked, and inadvertently break them.

Traditional fastening of the bezel requires longer dismantling. We'll have to unscrew the mounting screw, or maybe even more than one.

And if you do such an operation quite often, then it is quite possible to spoil the thread. After that, you will not have to change the socket, but the entire socket.

If you plan to use sockets and switches even at the stage of finishing work, then it is better to choose mechanisms with protective covers.

They, firstly, protect products during transportation. And secondly, they allow you to paint walls, stick wallpaper even without dismantling the front panels.

Overlay frame

Frames in good rosettes are attached independently of the bezels. This allows you to freely carry out their dismantling and installation.

In the old series, the frame is fixed and tightened by the front panel. Therefore, in them, the replacement of the frame with another one of the same, but of a different color, occurs only simultaneously with the panel.

Moreover, it will be better if such products turn out to be two-layer.

• outside - ABS plastic

• reverse inner side - durable polycarbonate

Inside the panel there are latches, due to which the fixation itself takes place on the mechanism. Please note that they may have several risks.

This will allow you to easily align the frames in case of slight unevenness in the walls.

Internal insulation

A high-quality socket, even with the front panel removed, ensures complete electrical safety.

All internal live parts are reliably closed and insulated. There is no access to them.

In the sockets of the budgetary series, there are always clearly open live parts.

And if you work with a screwdriver that has an uninsulated sting, then you may well either get under voltage, or accidentally close the phase and the grounded case with the sting itself.

In accordance with safety regulations, all sockets installed in living rooms must have protective curtains. How do good sockets differ in this regard from cheaper ones?

In budget products, the shutter mechanism is fixed directly on the back of the front panel.

Very often, due to such curtains, the following problem arises. There are combination plugs. That is, some of the legs of the plug are insulated with plastic, and the ends themselves are metal.

Most often, such plugs are used in various kinds of chargers. They have slightly thicker metal ends than the middle of the contact legs.

Such a plug is plugged into a regular outlet without problems. But when you try to remove it and pull it out, the protective curtains bite the contacts like a guillotine.

Biting occurs precisely at the border of the transition of plastic-metal materials. As a result, the plug sticks in the outlet.

And in order to pull it out, you have to put extra effort. Often it all ends with a break in the protective curtains.

In a good modern outlet, the shutter mechanism is recessed into the body, and is not located on the back side.

Accordingly, such a problem as biting a fork simply does not exist. Any plug goes in and out of it very gently.

Mount

Fastening of sockets is carried out in both traditional and new models either on screws that are in the socket, or on grips. When tightening, the grips bite into the walls of the socket box.

However, there are some peculiarities in the design of improved models. The so-called "double tooth" technology is used here.

It allows you to increase the breakout force by about one and a half times.

Another difference of a high-quality socket is the presence of a special profile, the so-called "dovetail". It allows very easy installation of sockets and switches in blocks.

If you need to connect two or more mechanisms under one frame, you set the very first one perfectly exactly according to the level of the Pocket Electric electrician, and mount the second and subsequent ones using a dovetail.

As a result, all mechanisms will quickly and evenly be installed in their seats.

Screw or screwless contacts

Modern and most of the old models also differ in the technology of connecting conductors. The newest sockets have screwless clamps that allow you to very quickly connect and disconnect the cores of cables or wires.

There are still heated debates among electricians about which of the contacts is more reliable. Allegedly screwless, they reduce the area of \u200b\u200bcontact with the wire.

Hence the conductivity and reliability are reduced. However, such a dispute resembles the age-old question, which is better than Wago or twist?

Much depends on the quality of performance and operating conditions. There are sockets where a sufficiently powerful spring exerts pressure on only one point - for example, from manufacturers Gira, Legrand, Schneider.

But ABB has a spring of less elasticity, but it presses at two points at the same time.

Use all products in accordance with the norms and recommendations and problems will never arise. For example, in some European countries, the use of screw terminals has been prohibited at the legislative level since the 60s.

The main advantage of screwless clamps is that this connection does not require further maintenance. As the manufacturer assures, after installation, subject to the rated loads, you will no longer look into such a socket for many decades.

All old sockets use screw technology. The stripped wire strands are clamped with traditional screws.

Moreover, the clamping force is also standardized. Professional installers use special torque screwdrivers for this.

Such contacts have a much higher labor intensity during assembly and disassembly. In addition, it is advisable to periodically tighten these clamps, that is, to service. And this entails the analysis of almost half of the design of the entire outlet.

Wires tightened by a screw during temperature fluctuations - heating at maximum load and cooling down when it is turned off, can shrink. And accordingly, the contact will weaken over time.

In high-quality sockets, conductors in screwless contacts are in a constant pressed state, even if they are hot, even if they are cold.

In addition, they have a limiter template on the back side, which shows how accurately in millimeters you need to remove the insulation from the core.