Choice of electrical outlets. What sockets to choose for the house? DKC - individualist in the market of electrical products

Wiring elements are an integral part of any electrical network. It is with their participation that the use of electricity is carried out. Therefore, during the repair process, the question often arises of how to choose sockets and switches for an apartment in order to ensure 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

Almost all switches and sockets 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, one should pay attention not only to external data, but first of all, take an interest in 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 petals, and in the switches, keys are provided for this purpose. Under the influence of the flowing current, the contacts are constantly heated. Additional Negative influence is exerted by an electric arc that occurs at the moment of breaking the circuit, due to which premature destruction of the contact groups often occurs.

High-quality products with an optimal design successfully cope with all loads and serve the terms that the manufacturing company sets for 15-20 years. They are not subject to overheating, do not allow sparks 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 together. 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 resistance to corrosion is used. The basis of the entire socket is the core, inside which the petals and contact clamps are connected. In old sockets, it was ceramic, and now a special electrical plastic is used for it, which is not subject to overheating and is resistant to mechanical stress.

Varieties of electrical sockets

How to choose an outlet? Typically, sockets are available with or without grounding (Fig. 1), which are selected in accordance with specifications. For example, or in bathrooms where powerful equipment is installed, sockets are subject to mandatory grounding, 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. The protective cover covers the socket and is an effective barrier to moisture. 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 mounting 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 equipped with a special valve or protective shutters are installed (Fig. 4). Thus, the device is protected from childish pranks and opens only under the action of an electric plug. Another type of socket has an ejection function (fig. 5) that allows you to easily remove the plug. The wire is additionally protected from damage, which is especially important with frequent changes in 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 sockets used in low-voltage networks. Antennas, radio points, etc. are connected to them. Some designs are equipped with several connectors at once. In private homes, power sockets 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 noted that these devices, like sockets, are presented in a wide range. In most rooms, conventional appliances are installed. Recently, switching devices equipped with backlight 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. According to the method of inclusion, they can be mechanical or sensory type. The light level is changed by simply turning the knob. Pass-through switches are designed to control light from various points in the room. They can be equipped with several keys connected to different lighting groups.

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

Criterias of choice

The basis for reliable and durable operation of switching devices are contacts that provide connection to the electrical network.

By their own design features contact systems are divided into two main groups:

• Screw. They have been used for a long time and are still used, including with a ground electrode. They are considered the most reliable, but require regular tightening at least once every 3 months. This is due to the gradual shrinkage of the conductor under the action of helical pressure, as a result of which the contact with the network becomes weaker. If you do not tighten it, it will gradually burn out due to repeated overheating, especially when using the socket for the hob.
• Quick release. Compared to screw contacts, they have undeniable advantages. Contacts after shrinkage are automatically tightened 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 homes. The new sockets have a grounding contact.

Of great importance is the material from which the switching devices are made. 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 from them are not destroyed by accidental impacts, they are resistant to high temperatures and do not ignite in case of short circuits and other damage to the network. Anti-vandal products used for outdoor installation and in public places.

The main facing materials are thermoplastic and duroplast. The first option is characterized by high plasticity and is used in most products. The only negative is the appearance of scratches from any mechanical influences. The second material has higher strength and rigidity. It is non-flammable and does not leave scratches on its surface. Duroplast is very fragile, but subject to the rules of operation, this drawback is not noticeable at all.

When designing the interiors of rooms in design solutions are used non-standard materials. The color of the sockets imitates wood, stone, glass. They are not as safe to use, so they require additional measures and better electrical wiring.

Electrical outlet safety

Compared to switches, socket outlets carry higher loads and are subject to damaging effects. electric current. In this regard, safety issues in the operation of these devices are in the first place.

First of all, for each device, you need to determine which current and voltage are best suited for it. For most sockets, you should choose values ​​corresponding to 6A and 250 volts. Before choosing, you must make sure that the degree of protection is suitable for the future place of operation.

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

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

The second digit corresponds to the degree of protection from 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, in addition to those listed.
• 5 - light water jets.
• 6 - strong water jet.
• 7 - short-term immersion in water.
• 8 - prolonged stay in water (full protection).

The most prestigious are products from manufacturers Legrand, Schneider, ABB and others. Everyone knows their advantages, 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 decent quality for a reasonable price. As a rule, these products work out the declared service life. Which one to choose, everyone decides for himself.

There are a lot of counterfeit products under the brands of well-known brands at present. To accurately select the switches of the desired type, you should follow some rules:

• Fake plastic is smelly. Therefore, it is best to sniff such sockets immediately.
• Estimate the weight of the device in your hand. The chosen expensive socket cannot be light, as they are made of high-quality and durable materials with normal thickness. The fakes feel too light, which is noticeable almost immediately when you pick them up.
• You need to carefully examine the body. There should be no cracks, and technical gaps are visible in a minimum amount. Original products are easily disassembled and assembled, and fastening is carried out using latches. If the case is screwed or soldered, then this device is counterfeit and can pierce to the ground.
• Check appearance and the condition of the contacts of sockets and switches. In normal condition, they are golden in color and are not subject to corrosion. Darkened metal parts indicate poor quality.

Sockets and switches are indispensable companions for enjoying the convenience that electricity provides. They are completely different shapes, appointments and configurations. You can choose exactly the product that best fits 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 fits your pocket perfectly. It will be very easy to do this if you read the suggested purchase rules below and follow them.

Both sockets and switches have many different functions depending on the product types.

socket types

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

• Sockets without grounding. They are used in cases where grounding is not provided or not required, for example, in residential premises.
  
• Sockets with grounding. Installed in places where it is important to have grounding. Most often, these are the kitchen or a socket for connecting a computer. They are also used in private homes.
• Cover sockets. The use of such an outlet is relevant in rooms with high humidity, such as a bathroom, boiler room, swimming pool, an external outlet on the house. Such products have a special cover that covers the entire area of ​​​​the 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 degree of protection in IP.
  
• Dual sockets. They are mounted in a socket, allowing you to use two electrical connections at once. Not very reliable mechanics of such an outlet may be unsafe.
  
• Sockets with 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 closed with a kind of curtain that opens only when an electrical plug is inserted into it.
  
• Plug-in sockets. They are equipped with a special button, by pressing which a person can easily remove the plug from the socket. Protects the wire from damage, relevant in places of frequent change of equipment, for example, in the kitchen or at the hairdresser.
  
• Sockets with off timer. The timer function allows you to independently set the operating time of the outlet. It is relevant, if necessary, to turn off the network at night or in production at the end of the working day. It is also used in combination with appliances equipped with a timer, such as air conditioning, electric oven, multicooker or TV.
  
• Special sockets. Designed for antennas, telephones, radio points, 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-in connectors, which are mainly used on construction sites to connect devices with particularly high power, such as a welding machine.
  

Types of switches

To more clearly imagine how to choose a circuit breaker or manual, 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, as they are not interchangeable, and you may have to go to the store to get a replacement if you chose the wrong option when deciding which sockets to choose.

How to choose a switch by type of design?

As already mentioned, switches can have several design options:

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

How to distinguish quality products from fakes?

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

What is the best contact system?

There are two types of systems:

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

What material is better?

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

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

Facing material

As facing material two types apply:

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

Safety performance

The main indicators that determine the degree of reliability and safety of the device are its technical specifications: Voltage and current of exactly calculated strength. These are the characteristics that should be considered first of all, if you are independently coping 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 look for a special IP code on the packaging of the outlet, which is a conditional indicator. It is marked with two numbers:

Of course, the higher the IP value, the better the protection and the more expensive the socket. Therefore, keep in mind that the standard indicators recommended for different types premises, meet the following parameters:

Price categories of sockets and switches

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

What color to give preference?

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

It includes the following design options:

Which manufacturer do you prefer?

All manufacturers listed below have already proven themselves in the electrical fittings market. Information about each of these brands can be found on the Internet. There is also a full range of products on offer.

Check out several well-known manufacturers to make it easier for you to choose when buying:

Video

Check out the video overview of sockets and switches to clearly understand distinctive features different kinds.

Conclusion

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

The choice of socket and switch must be carried out taking into account the specifics of the use of the premises, the reputation of the manufacturer of the relevant equipment and the features of the devices to be connected.

The choice of such products can make even a professional electrician think: the range on display, presented in a specialized store, is wide and varied. And it is not easy for a simple 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 should be installed in the apartment

Two common groups that do not leave much choice for 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 original decorative purposes or is recommended by fire safety regulations for installation in wooden rooms. In an apartment, office or institution, internal sockets are used, in which only the rim and holes for the plug remain for a visual overview.

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

Correct selection options

Categories of sockets and switches for an apartment are divided into simple and special. Expensive web-driven innovations with a special type of grounding, or designed for low-power media, 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 protection against children - for installation where there are small children, with protection against dust and moisture - in the bathroom, retractable - in the kitchen.

For bathroom

The PUE norms previously prohibited the installation of an outlet and even a switch in the bathroom, in order to avoid electric shock. Even washing machines came with longer cord lengths to allow connections to be made from the outside with moisture. Now there are sockets with a spring-loaded cover that provide protection against drops 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 a washing machine, there must be a copper cable of the appropriate section to it, and if it is also planned to connect 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 their verified number and exact location for the appliances used. If you have to stretch the extension cord, then this is both unaesthetic and inconvenient. A free outlet for a laptop or charging can be simple, or protected from pollution. 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 at the back of the appliance and requires effort to reach the right place.

Bedroom and hall

The main criterion for choosing a switch and a plug connection in the bedroom and living room is maximum convenience. Most often, the most banal one is used here - a toggle 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 you to immediately provide darkness and silence with one touch.

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 make it easier to press when awake with the same light of the indicator, only with a soft toggle key of the overhead type. It is easy and simple to find it with your hand in the dark, and the characteristic click is much quieter.

Living room and corridor

There are no restrictions, except for the correct location and aesthetic component. For both types of electrical appliances, the most convenient place is provided, and their number and height are calculated depending on the electrical appliances used. A computer and a TV, a home theater and an electric fireplace, shelving lighting, a table lamp or a floor lamp by the chairs are taken into account. All that is required from 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 match the style decision - be built-in, in a suitable color, and if it works 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 the office or bedroom, but on the balcony and equip a workplace there, you should also think about an outlet for the Internet.

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 that the provider uses. Twisted pair is determined by the transmission speed and the best choice of a special device for connection will be category 5 and 6 products, for example, RJ-45. If the supermarket does not have a consultant for this category, or it is not well aware of the type of product for connecting the Internet, it is better to consult a person who is involved in this area.

How to distinguish a fake

Absolutely simple process, even in appearance. If there is no special marking, or it is somehow stuck, plastic products are distinguished by roughness and a pungent odor, uneven or uneven gaps between the constituent segments - this is already a sign of falsification. You can look at the material of manufacture and contacts (they should not be crumpled and made of thin metal).

TOP popular brands: what to take

Recommendations from professionals involved in the installation of electrical wiring equipment from Legrand, Schneider Electric, Polo, ABB, Jung are excellent, and preference is given in the listed sequence. Legrand collected the greatest number of favorable reviews: buyers note the original design, the quality of the materials used, the multifunctionality of the device and the long-term, trouble-free operation.

The best inexpensive sockets and switches

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

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

Useful video

If with constructive it’s understandable (the socket box is embedded - we put it hidden, it’s not in the wall - we go for the outside), then less noticeable details require attention. First of all, we look at contacts- two stamped brass plates, as is done on cheap sockets, are only suitable for low-current loads, even if “16 A” is proudly written on the socket. 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 spring loaded contacts are the only right choice for frequently used outlet, high power consumers. Expensive? But after all, we buy an outlet for years, not weeks.

If you have or are planning to have children at home, please select outlets with protective shutters covering holes. Moreover, the curtains should open precisely when both are pressed at the same time, when the plug is inserted, and not one by one. Did you put nails in sockets as a child? The author had to. True, it was not a nail, but a wire, but I still remember it, and even, it seems, prompted me to choose a specialty. The same curtains will be useful, for example, in the kitchen - some kind of splash protection, but in such conditions, of course, a full-fledged cover is definitely better.

Mechanical strength it won't be redundant. No, of course, we all know that you can’t just pull the cord out of the socket 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, both the mount itself in the socket box and the mount of the frame must be solid.

Happy shopping!

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

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

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

The new sockets are made of two layers:

• lining - polycarbonate

What benefits does it provide? 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 insulated. And touching it with your fingers will not shock you.

But often, many electricians unwind and disassemble sockets to find a malfunction without even removing the voltage from it. This feature is very cool to protect against accidental electrical shocks.

And the presence of two layers allows you to increase the strength of the entire structure by about 50% in front of a traditional galvanized steel caliper.

The front panel is fastened with latches. For dismantling and mounting it back, it takes no more than 3 seconds.

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

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

In the same way, put it in place, pressing down and snapping into place at 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 initially snapped into place, and inadvertently break them.

Traditional fastening of the front panel requires a longer dismantling. You will have to unscrew the mounting screw, and 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 have to change not 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 the products during transportation. And secondly, they allow you to paint the walls, stick wallpaper even without dismantling the front panels.

overlay frame

Frames in good sockets are attached independently of the front panels. This allows you to freely dismantle and assemble them.

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

It would be better if such products are two-layer.

• outside - ABS plastic

• reverse inner side - reliable polycarbonate

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

This will allow you to easily align the frames in case of small wall irregularities.

Internal insulation

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

All internal current-carrying parts are securely closed and insulated. There is no access to them.

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

And if you work with a screwdriver that does not have an insulated tip, then you can either get energized or accidentally block the phase and the grounded case with the tip itself.

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

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

Very often, because of such curtains, the following problem arises. There are forks of the combined type. That is, part of the legs of the fork is insulated with plastic, and the ends themselves are metal.

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

It plugs into a normal socket without any 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 socket.

And it takes a lot of effort to pull it out. Often all this ends with a break in the protective curtains.

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

Accordingly, such a problem as biting a fork simply does not exist. Any fork enters and is removed from it very gently.

Fastening

The fastening of sockets is carried out for both traditional and new models either on screws that are in the socket or on grips. When tightened, the grips dig into the walls of the socket box.

However, in the design of improved models there are features. The so-called “double tooth” technology is used here.

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

Another difference between a high-quality socket is the presence of a special profile, the so-called “dovetail”. It makes it very easy to install 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 be quickly and evenly installed in their seats.

Screw or screwless contacts

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

Among electricians, there is still a heated debate about which of the contacts is more reliable. Allegedly screwless, reduce the area of ​​contact with the wire.

This reduces the conductive capacity and reliability. However, such a dispute resembles the age-old question, what 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 just one point - for example, from manufacturers Gira, Legrand, Schneider.

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

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

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

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

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

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

Wires pressed with a screw during temperature fluctuations - heating at maximum load and cooling 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 preloaded state, even hot, even cold.

In addition, they have a limiter template on the reverse side, which shows how accurately millimeters it is necessary to remove the insulation from the core.