Switchboards and boxes, terminal blocks, accessories. Street box for an electric meter: requirements and features for choosing and installing an electrical panel Electrical shields for machines dimensions

Owners of private households sooner or later have to take out utility meters to the street. Service organizations have a number of requirements for this event. One of them is the corresponding paragraph of the PUE, according to which the shield is installed on the facades of houses, supports, poles, fences, etc.

We will talk about how, according to building codes, to position and secure the street box for the electric meter. The article we have proposed describes in detail the selection criteria and rules for installing a box for a flow meter and other equipment. Useful recommendations for the assembly of the shield and the installation are given.

The box has three functions. The first is to ensure the safety of people during the maintenance and operation of the power grid. Box must be grounded.

The second is to create optimal conditions for appliances located inside. The design must be well protected from atmospheric influences: moisture, sunlight, wind.

Boxes for electric meters are made of metal or plastic. The latter are considered safer in operation, because they exclude electric shock to the user.

The third is to provide access to the meter to representatives of the service organization. This condition is spelled out in contracts with consumers, although there is no direct requirement in the PUE to install meters on the street.

Varieties of boxes by type of design

Foreign and domestic producers They offer boxes of various sizes and capacities. The option is selected depending on the parameters of the equipment that is planned to be placed in the box.

The dimensions of the shield are also selected according to the type of counter. Single-phase metering devices are smaller than three-phase ones in size, sometimes twice

There are also certain markings that suggest the type, purpose of the box. Example:

• SC- the most common and the simplest;
• SVR- the box which is built in deep into a wall;
• SCHRN- distribution box.

If it is just a metering board, it usually contains only a meter, an input machine, ground and zero buses. , and are also installed in the "home" box. But you can combine it all in one box.

The design of the shield can be:

• floor;
• embedded;
• consignment note or hinged;
• hidden or open;
• whole or split.

What kind of equipment, in what quantity and with what parameters should be installed in the box - all these points are prescribed in the project. If there is no such document, consultation of specialized specialists is needed.

The main criteria for choosing a box

The main task of the consumer is to find a durable, practical box that will withstand long service in outdoor conditions. The box should be convenient for installation and operation.

What is important in the design itself? The presence of holes of the appropriate diameter for wires that come from the support and lead to the building. It is desirable that these elements have sealing gum and plastic couplings.

A handy detail is the window. It eliminates the need to open the reading shield and reduces the frequency of contact of the internal contents with air, moisture. Pay attention to the ears for sealing.

The IP20 index means that the box is protected from dust particles larger than 12.5 mm, but is defenseless against moisture. IP65 guarantees complete isolation from these negative factors. The higher the number, the more expensive the design. The best option is with an indicator of 54.

When choosing a switchboard, you also need to look at the thickness of its walls, the operating temperature range, the number of leaves, and the type of lock. The box can be closed with one individual key or be equipped with several identical ones.

Box installation requirements

The meter and additional equipment may only be installed in a sufficiently rigid structure. It should be well insulated from moisture and other negative atmospheric phenomena.

Meters with significant temperature differences can give errors in readings, so it is recommended to insulate the box with special caps or heating elements. This will also extend the life of the devices.

Key Points PUE-7:

1. The distance between the floor and the box with the meter clamps should be in the range of 0.8-1.7 m. The deviation of the first indicator up to 0.4 m is allowed.
2. If the location is accessible to unauthorized persons, the box must be equipped with a secure lock and a viewing window.
3. The design and dimensions of the cabinet should provide easy access to all elements of the installation and the possibility of replacing devices, if necessary.
4. During installation, the ends of the wires from 12 cm must be left near the meter. The segment of the neutral wire at a final length of 10 cm must have a distinctive color.
5. Grounding with copper protective conductors is mandatory.
6. Wiring must not have soldering.
7. Verification terms: for three-phase meters - 1 year, for single-phase meters - 2 years.

In addition to the requirements for the counters and boxes themselves, the rules also apply to cables, wires, fasteners. For a multi-core cable, the use of NShVI (tip) is mandatory. When attaching the ends of the cables to the equipment, pressure seals (glands) are also needed.

One of the options for arranging an electrical panel in which a metering device is installed, an introductory machine. The layout of the devices and their specifications selected depending on the parameters of a particular electrical network

DIY wardrobe

If you have experience and desire, you can equip a cabinet for an electric meter yourself. It will be necessary to buy the structure itself, arm necessary tools and conduct in accordance with the specifics of the home electrical network.

If you come across a cabinet of the required dimensions, but it lacks a window, lugs for seals or some holes, these elements can be added. But the work must be carried out in accordance with the safety regulations and the requirements of regulatory organizations.

All necessary equipment mounted on DIN rails. Many models of metering devices are supplied with parts that may be useful during installation (stickers, caps, fasteners). The main task is to assemble the devices and combine them correctly.

Models of outdoor meters

If you are buying new counter, and do not take the existing one out of the room, you need a device suitable for outdoor use.

Pay attention to the following points:

• Induction models are much more sensitive to temperature changes than electronic ones.
• DIN rail as a mounting method is preferable.
• Go to the website of the power supply organization and see which models are allowed for installation in Russia.
• For a multi-tariff payment system, choose a device that can take into account more than three tariffs.

Brand awareness and availability service centers also matters. A proven manufacturer means quality, maintainability, and the loyalty of inspection organizations.

Of the domestic brands available for sale, the following can be considered: INCOTEX, Taipit, Energomera, EKF. Such a model as Mercury 230 AM-03 is especially popular. It is single-tariff, capable of giving accurate readings in the temperature range from -40 to +55 degrees.

Of the foreign manufacturers, they have proven themselves well: the Swedish-Swiss ABB, the French Schneider Electric, the Turkish Legrand. But for European brands, the operating temperature range often does not correspond to Russian realities.

It is advisable to consult with the specialists of the service organization in your area. Usually they have a list of devices that have already shown themselves with better side during operation.

Machine and heater

A circuit breaker is installed in the box before the counter. Its parameters must be calculated from the total power of all consumers - electrical appliances installed or planned in the house and on the street / in the garage and other household buildings.

If, for example, the total power is 25 kW, then a 63 A automatic machine is optimally suited to this value. With the help of the latter, the readings are automatically transferred to the processing center. But such a scheme can not do without a heater.

The heater for the electrical panel can be turned on and off manually or automatically. It is needed to maintain optimal temperature in the cold - electrical appliances need heat to work without errors

Heaters for switchboards are made of aluminum, which is covered with non-combustible thermoplastics.

The main functions of the element are to prevent the appearance of condensate, which prevents corrosive changes in current-carrying tires, contacts and protects devices from high humidity.

Transfer device and SPD

If the electrical installation has an autonomous power source, a reserve device must be installed after the meter. This device is needed to manually switch consumers from the external network to the generator and vice versa.

The reserve input device excludes the simultaneous activation of two different power sources (external network and generator), which is its task

To protect the installation from lightning strikes, high-voltage surges and fires from these effects, an SPD (surge protection) is added to the shield. It is placed after the introductory machine and through a separate fuse. An SPD is mandatory if entry into the building is by air.

Additionally, a cross-module for distributing electricity across different groups consumers. Sometimes a differential automaton is also added to the box.

The socket is one of the optional elements. But if you only have construction on the site or you need a street connection for some equipment, you can’t do without it. And do not forget about the zero rail, it combines all zero cables and is used to switch cores.

How is the installation carried out?

The connection of all equipment must be done by an electrician, provided that he has the documents necessary for such work. The owner of the power transmission line has such specialists. Inviting someone else or doing everything yourself is impractical.

Unskilled craftsmen may not compare the technical characteristics of the input equipment with the actual loads on the network, “forget” about electric shock protection devices, or even make gross mistakes in the sequence of their connection. Therefore, it is highly desirable to know how installation is carried out.

First, an input device is equipped - this is the cabinet itself, where there are protection mechanisms and connections for incoming cables with outgoing ones. It is good if the pipe with the cable enters directly into the box itself. Consider the connection process using an example with a three-phase network.

The figure shows how the three phase conductors (L1, L2, L3) are connected to the input contacts of the breaker. The latter will cut off the entire network if necessary. The figure also shows: N – zero; PE - earth

There are a lot of knife switches on sale, one three-pole machine is suitable, which can be moved outside the input device. One of these designs is YaBPVU-100. it iron box with NC contacts and 100 A fuse links.

The most important element of the input device is the grounding bus, to which a re-grounding with a neutral incoming conductor is connected. It splits the PEN conductor into a ground wire and an outgoing zero. Further, the cable from the box goes to the house where its shield is installed.

Zero splitting can also occur in the input device itself. In this case, the shield will be called the input-distribution.

If it is meant to disconnect street wiring, a special tap can be made from the main shield. So devices designed for three-phase power supply will have separate machines, RCDs.

Equipment is connected via power plugs or busbar boxes. Their degree of protection must be greater than or equal to IP45.

How to assemble and install a shield for a meter in an apartment is described in detail in, which we recommend that urban housing owners familiarize themselves with.

Conclusions and useful video on the topic

Video #1 Assembly of all box elements before installation:

Video #2 Assembly and installation of a three-phase meter instead of the old single-phase one, plus an estimate of such work:

Video #3 Analysis of the process of connecting electricity from a support (pole):

To install a box for an electric meter on the street, you need to choose the box itself and its internal equipment so that the design and devices can withstand outdoor conditions. You can assemble the shield yourself, but it is better to entrust all connections from the support to the house to the master from the service organization.

At the entrance of the internal network of an apartment, house or cottage, an apartment is almost always installed. switchboard(KShch), which houses the electric meter and circuit breakers (AB) and other equipment. let's consider functional purpose this device, design features, installation and connection rules.

Functional purpose

Any switching device must have appropriate protection to prevent contact with current-carrying elements and prevent foreign objects from falling on them that can cause a short circuit. In addition, electric devices are installed in the switchgear that perform the following functions:

• electricity consumption accounting;
• protection of the internal network from overload and short circuit;
• manual disconnection of any of the internal lines, for example, for repair work.

Design and performance features

KShch is a plastic or metal box equipped with a door, inside which there are special seats for a meter, AB and other equipment.

Designation:

• A - housing made of non-combustible plastic or metal;
• B - lockable door;
• C - viewing window, for taking readings of the electric meter by employees of the controlling service;
• D - mortise lock;
• E - mount for the meter;
• F - Din-rails, which are a standard profile on which equipment is installed (AB, RCD, zero bus, etc.);
• G - panels that block access to live parts of installed electrical appliances.

There are two types of housing - for external and internal installation.

The size of the box depends on the estimated number of installed modules.

Another factor influencing the design of the electrical panel is the protection class. Below is a table deciphering accepted designation according to certain operating conditions.

For example, we have a switchgear with an IP65 protection class, according to the table above, this parameter indicates that with this design, dust and water splashes are guaranteed not to penetrate into the structure (provided that the door is closed).

What to look for when choosing?

When choosing a SC, one should be guided by the following factors:

1. Housing attachment method. If you plan to install on concrete wall panel house, then preference should be given to a box designed for surface mounting. Otherwise, there is a high probability of violation of integrity bearing wall. In addition, the installation process itself will be significantly complicated.

Accordingly, when installing in a hollow wall, for example, a plasterboard partition, an embedded structure is selected.

1. Estimated number of units. Their number is determined by the characteristic features of the wiring. As a rule, each line is connected to a separate protective device. It is recommended to leave a margin of 20-30%, in case of a possible upgrade of the internal network in order to connect any electrical appliances, such as an air conditioner or a boiler. Replacing the switchgear requires more effort than installing another AB module.
2. Choice of protection class. It is determined depending on the operating conditions. If you plan to place it indoors, you can limit yourself to categories IP30-40. For an external electrical panel, more than high class protection (IP44-65).
3. The choice of material. Here you should also be guided by the location. If the shield is supposed to be installed inside a residential building, then, from an aesthetic point of view, a plastic case is preferable. Metal boxes are more suitable for a garage, workshop or other utility room.

The correct choice of the switchgear is very important, since after its installation and connection it is not possible to quickly replace the switchboard.

Since the shield refers to electrical equipment, it must be accompanied by a technical passport, which reflects the following information:

• model name;
• manufacturer information;
• technical specifications(permissible value of voltage, current and frequency) and specification code;
• assigned protection class;
• date of manufacture.

The absence of a passport indicates that the product is most likely counterfeit, and its technical characteristics may not meet the standards. For example, non-refractory plastic was used in the production.

Selecting an installation site

In a residential area, it is advisable to allocate a single zone for placing devices in it that provide connection to external telecommunications networks and a power source. The centralized location greatly simplifies the maintenance of these systems. As a rule, a place is allocated for such a zone inside the apartment next to the entrance. AT panel houses there are special niches in the tambour room.

If produced external mounting, then under the box of KSh it is necessary to put a base of non-combustible material.

The lower edge of the box must be at least 100 cm from the floor level, while the upper part of the case is limited to a height of 180 cm. This range can be reduced to 50 cm and 130 cm (respectively) if disabled or elderly citizens live in the apartment.

• in the danger zone belonging to category "0", "I" and "II" (showers, bathrooms, etc.);
• in interior items and furniture (for example, a closet or wardrobe);
• above heating installations;
• next to plumbing fixtures;
• over a gas or electric stove;
• outside the territory of the house (the restriction does not apply to metering boards);
• on loggias and balconies, including glazed ones;
• in the bathroom;
• on a flight of stairs;
• in any damp room;
• in the ventilation shaft.

Example of internal wiring

Let us give as an example the wiring diagram of the KShch of a one-room apartment.

Designations:

1. Bipolar AB. Through it, a connection is made to an external single-phase source (220 volts).
2. Metering device.
3. Residual current device (in this case, it is common to all three lines).
4. Zero distribution bus.
5. AB for lighting.
6. AB to sockets.
7. AB to a separate electric stove power line.
8. Ground bus.

The diagram shows the ratings of AB and RCD, as well as the cross section of the wire. Information on how to choose these elements correctly can be found on our website.

Selection of equipment for switchgear

When choosing electrical appliances and cable, you must be guided by two criteria:

1. Technical specifications.
2. Manufacturer reliability.

If to determine the technical parameters it is enough to carry out a few simple calculations, then in choosing a manufacturer, not everything is so simple. There are many inexpensive counterfeit products on the market. In addition, there are often outright fakes of famous brands. Therefore, we recommend checking that the electric devices have the appropriate certificates. This is especially true for metering devices. Any electricity supplier company will refuse to connect an uncertified meter, as well as a device that has not been verified.

For all internal switching of the switchgear, it is recommended to use a solid wire PuV. It is allowed to use a stranded analogue - PuGV, provided that the twisted wires at the ends are crimped with special lugs. The wire insulation of these brands is made of non-combustible material, and retains its properties in the temperature range from -40°C to 75°C. The service life of such wires is at least 15-20 years.

To bring the phase to the input of the automata, you can use a special element "comb", it is used as a distribution bus.

Concluding the topic, we will offer some tips that will help you assemble a shield for an electric meter and machines without gross errors:

• it is not allowed to pass a wire or cable under the fastening profile AB;
• when tightening the clamps, the value of the applied moment of force should be in the range of 2.5-3.5 Nm;
• if the box is made of metal, it must be grounded;
• the length of the supply of connected cables should be one and a half to two times the height of the switchgear, but at the same time not exceed 400 mm;
• all internal switching lines must be marked, this requirement also applies to installed electrical appliances. Below them, or on the door, there should be a table indicating the purpose of each element.

Electricity meters and circuit breakers are necessary attributes electrical networks. These devices are mounted in special switchboards, which are already installed in the entrances of houses. This is not provided for in private houses, however, the modern market allows you to choose any shield for an electric meter and machines of a suitable size and design. The appearance of such a box is now important, as it is being installed more and more often inside the house. In this article, we will get acquainted with the feature of such boxes, what types they are, and what to look for when buying.

What is

The standard equipment of the electrical panel is as follows:

• Electric meter;
• Differential machines;
• Introductory machine;
• Automatic switches;
• 2 tyres.

Now let's get acquainted with the built-in elements, and what they are used for:

• DIN rail. It is a special device made of metal plates. It happens that the rail is too long, in which case it is cut with a hacksaw;
• Electric meter. Necessary to take into account the consumption of electricity;
• Automatic switches. This equipment protects electrical wiring. Before installing them, you need to know what is the power of the devices that will be connected to the network;
• Distribution bus. With its help, neutral wires are connected. There are closed and open;
• RCD. A residual current device that ensures safety against electric shock;
• Electrical wiring.

Where is the shield installed?

Before installing the box in the apartment, first of all, it is necessary to draw up detailed plan, take into account how the rooms will be furnished, where there will be lamps and switches for them, various household appliances and so on. Together with electrical wires others are being laid engineering Communication, heating pipes, pipelines, alarms, internet and so on. The project should be developed in such a way as to optimize the routes of the described systems.

Important information! An electrical panel is a place where a cable from an energy supply company is connected to a meter in order to further distribute electricity to consumers.

While undertaking a project, it is necessary to determine the most appropriate place where the electrical panel will be installed. In the last century, it was mounted directly on the landings, but now the installation method is being popularized right in the apartment. This is not only convenient, but also ensures that unauthorized persons will not have access to the box.

As practice shows, the most suitable place is a corridor, close to front door and at the level of the face, in order to more conveniently track the meter readings. Mounting the box, therefore, is not required long length power cable.

For those who live in country house, more subtleties will need to be taken into account: how to safely organize an input device into a building, how a branch from overhead line power lines. In addition, you will need to contact the power supply organization to find out the details regarding their device.

Features of choosing a shield

When choosing a box, you need to understand that they are divided according to the following parameters:

• What material are they made from?
• In what area are they used?
• Mounting method;
• The amount of equipment placed inside.

Note! When choosing a shield, you should pay attention to such a parameter as the IP protection class. For indoors, the class should be 30 or 40, for outdoors - 65 or 67.

The degree of protection IP is how well the devices are isolated from dust and moisture. The higher the number, the higher the protection. For example:

• IP20 - installed in apartments. 0 - no moisture protection. 2 - provides protection against large dust particles;
• IP21-23 - installed in unheated enclosed spaces or under awnings;
• IP44 - installed outdoors, under visors or with additional protection;
• The most protected shields are those whose protection class is IP54 and IP66 - they are installed outdoors and are not afraid of exposure to rain or wind.

Note! It is convenient if the cabinets installed in the entrances or on the street have a viewing window that allows you to take readings. Working with such shields, you do not have to open the door every time.

A modern shield for an electric meter is made from a variety of materials, such as:

• Plastic. Such boxes are installed inside the apartments and office space. The products themselves may differ in internal configuration, colors and external design. A lock may be provided on the door. When choosing a shield made of plastic, you must be careful with the manufacturer's data. You should not choose products from little-known suppliers at low cost - such boxes are made of low-quality plastic, which yellows over time under sunlight. These products have both pros and cons. The main advantage is ease of installation. The shield is easily mounted into drywall or similar walls. For the manufacture of electrical panels, a dielectric material is used, so they do not require additional grounding. Plastic cases are characterized by durability and visual appeal, so they are in harmony in any interiors. The disadvantage of the material is that it is combustible and quite fragile. If the shield installed in the wall gets damaged, it will be difficult to replace it;
• Metal. Boxes with a metal case are installed in garages and on open spaces. They are strong, durable and resistant to external influences. In addition, they are not flammable and are not afraid. high temperature. However, the disadvantage is significant: mandatory grounding is required, and the metal itself, being in an aggressive environment, corrodes. Usually, metal boxes are established in entrances of apartment houses or at the enterprises.

If you intend to install it outdoors, then it is better to pay attention to the anti-vandal design, for the manufacture of which sheet steel with a thickness of 1.2 mm or more is used. These boxes are equipped with two doors: one is blind, the second is a viewing window for the meter.

Advantages of installing a shield on the street:

• Quick access to the electric meter by the inspector;
• In some country residences, shields reach impressive sizes, therefore, in order to save free space, they are taken out into the street;
• If the shield does not fit into the interior interior, it is mounted on the street.

Cons of street accommodation:

• Based on the rules of the PUE, outdoor cabinets should provide for local heating, which provides the meter with a positive temperature. It is not always possible to comply with this condition, and induction devices at sub-zero temperatures simply “lie”;
• In order to take readings from the meter, it is necessary to go outside, where there may not always be good conditions;
• Necessity of constriction of group lines.

The type of shield mounting also differs, so they are:

• Overhead. They are installed on the surface of the walls. Allow to distribute open and hidden wiring;
• Embedded. Mounted in niches located in the walls. Used only for hidden wiring.

Depending on how much additional equipment will be installed, you should decide on the capacity of the shield. Electric boxes have a different configuration, depending on the number of places: 12, 24, 32, 64 and more. One place has a standard distance - from 17 to 18 mm. You need to be careful, since each device takes up a certain number of places. Experts recommend using boxes with a margin of space (especially for built-in shields), which may be required when upgrading the electrical circuit. Minimum size similar devices is 16-24 seats.

• Technical specifications;
• Manufacturer reliability.

To determine the technical parameters, simple calculations will be required, but making sure that the manufacturer is reliable is not so simple. In the modern market there are inexpensive counterfeit products. In addition, you can stumble upon an outright fake of a well-known brand. Therefore, when choosing equipment, you should check the availability of the appropriate certificate, especially when it comes to metering devices. No power supply company will connect non-certified equipment that has not been tested.

On the this moment Many companies are engaged in the production of boxes. Based on practice, preference should be given to the following companies: ABB, IEK, Makel. If electrical work is required, these brands appear most often. Products from ABB are considered the highest quality, and the last 2, although inferior in quality, are popular due to their affordable cost. If the main preference is the visual component and at the same time reliability, you need to choose equipment from the Greek manufacturer FOTKA.

How to install the counter in the shield

Before installing the meter, you need to figure out in what order the device will be connected to the electrical line. In some cases, the controllers approve the independent connection of equipment. It is better to provide a protective shutdown device in front of the meter. Typically, in the case of single-phase network a bipolar circuit breaker is installed. The functions of this device are as follows:

• Provides meter protection against short circuit. Allows you to carry out preventive work;
• Capable of limiting the allowed power.

By setting the counter, other actions are performed:

• The meter is attached to the shield with a special latch;
• It is necessary to install outgoing single-pole circuit breakers.

Regulations state that the electricity meter must be installed at a height of 80 to 170 cm.

A person is constantly surrounded by various electrical appliances. Modern devices can conduct current, which happens most often due to damaged insulation. If the device is not grounded, it is very dangerous to touch it. To avoid accidents, an RCD is recommended for installation. The purpose of the device is to protect against electric shock (short circuit or damaged insulation).

Shield installation

It is necessary to decide where the box will be fixed. As a rule, this is a hallway, not far from the input of the power cable. It is installed at a height of 1.5 to 1.7 meters. Holes are made in the wall, and the box itself is fastened with dowels or self-tapping screws.

After the shield is installed on the wall, its assembly is as follows:

• In advance, all groups of wires must be brought to the shield. They must be marked, which will facilitate assembly according to the scheme;
• Using self-tapping screws, a DIN rail is attached to the shield, on which the devices will be installed;
• The upper part is equipped with a bus for neutral, the lower one for grounding;
• In the upper part, an automatic input is installed;
• The introductory machine can be located in a separate box, like the counter;
• As for the groups of machines, they are placed from top to bottom, as the power decreases. The jumper between them is a special bus, or it is used copper wire with a section of 4 mm;
• Cables and wires are introduced into the box through the provided hole. It is necessary to cut off the outer braid from them, and the gasket is carried out by color. It is necessary to leave a margin that may be needed for further repairs. Zero cores are connected to the top bus. Power is supplied to the upper terminals, the load is connected to the lower terminals;
• When connecting each group, it is recommended to check its performance by applying voltage through the temporary connection circuit.

Important! Initially, the shield is assembled without switching, which allows you to mark the installation locations of the devices. If necessary, the power must be quickly turned off, both from the outside and from the inside, which must be provided for.

In the closed state of the shield, it is important that it is possible to check the voltage with an indicator screwdriver.

When choosing a shield, it is necessary to build on the size of the electric meter and the number of packages installed. In any case, you will have to resort to the help of an electrician: to connect the common circuit and to seal the meter. Picking up a box is not difficult, but first you need to correctly draw up a project so as not to make a mistake.

Video

An important part of the power supply system is the electrical panel for the meter and machines. It is with the determination of its location that planning or modernization begins. electrical networks. The device is a distribution box used to control and manage all electrical wiring lines. Therefore, it is so important to choose and install it correctly.

The electrical panel is a switch box, designed to accommodate input devices, protection elements and an electricity meter in it. Such boxing is used both at production facilities and in private houses and apartments. In the technical documentation, you can also find another name for it - a distribution point.

In fact, the device is a box with seats for mounting electrical accessories. Its design includes a door designed not only to protect the equipment in the cabinet, but also to prevent electric shock. Depending on the purpose, the shields produced by the industry can be:

Thus, electricity is supplied to the socket or lighting groups from the shield. In the floor or apartment device, all the electrical equipment necessary for this is installed, for example, batch circuit breakers, RCDs, voltage relays, an introductory differential machine, zero and ground voltage blocks. In addition, an electricity meter can also be mounted in it.

Requirements to different types shields are the same. They are designated in the rules for the operation of electrical installations (PUE) and GOST 51321. The main content of these documents is as follows:

Shield types

The division of shields by purpose is conditional and is intended to be indicated on building plans or in other documentation understandable to specialists. For consumers, electrical cabinets are divided according to other criteria. First of all, this includes installation, which can be built-in or mounted.

The built-in (internal) design looks more attractive, as it forms almost one whole with the wall on which it is placed. The second type is hung using fasteners, which allows it to be used even on thin partitions. It should be noted that there is also a floor-type shield, made in the form of a cabinet and used only in production.

In addition, electric boxes differ in size and material from which they are made. Metal or plastic is used as a basis for them. There is no fundamental difference between the use of one or another material, but for a built-in or outdoor version, a plastic box is recommended, although the metal one is vandal-proof and has a lock.

All shields have their own marking, consisting of letters and numbers. So, ShKU means an apartment accounting shield, ShchKR - distribution, ShchRV - internal, and ShchRN - hinged. The number after the abbreviation indicates the number of modules that can fit in the fixture. For example, the marking ShchRN-10 means that the electrical cabinet is designed for wall mounting and is designed for the installation of ten modules.

There are also models with a mounting plate. They are designated ShMP. Due to their small dimensions and good appearance, they can be used both in storey niches and in apartments. The difference between street fixtures (SCHRNM) is the ability to remove the mounting panel, which allows you to increase the usable volume of the box.

Characteristics of distribution blocks

Technical specifications junction boxes for electric machines associated with ergonomics and the number of simultaneously installed modules. So, the quality of the fixture depends on the accuracy of fitting the elements, the type of materials used in the manufacture and the coating of metal parts. The following structural characteristics are distinguished:

1. Dimensions. Specified in millimeters. Most often, the electrical panel is made in a rectangular shape.
2. Number of modules. Indicates the number of seats for electric machines. It should be noted that some devices, such as differential automata, may occupy more than two places. The unit of measure is pieces. Additionally, a place can be provided for installing an electricity consumption meter.
3. Material. Guards are made of metal or nonflammable plastic.
4. Place of use. There are options for outdoor and indoor execution.
5. Door type. If a door is provided in the electrical panel, then it can be transparent or deaf. Executed from sheet metal or plastic and can be supplemented with a fireproof seal, and also have a latch or a full-fledged lock.
6. Type of instalation. It can be of three types: mounted, built-in, floor.
7. Protection level. This value corresponds to the standard international classification. It is characterized by the IP protection system, which determines the degree of resistance to impact of solid objects and water, and IK, which indicates resistance to impact (the more the better).
8. Color. Produced in various color scheme, may have the texture of wood or other decorative material.

Nuances of choice

AT outlets electrical panels are presented in a large assortment. They are produced by almost all leading manufacturers of electrical accessories. Most often, electricians choose shields of such trademarks, like Schneider Electric, Hager, ABB, Legrand, Viko, IEK, Makel (the last 3 are the most budget options).

Before you purchase a device, you will need to decide where the box will be located and what electrical accessories you plan to install in it.

Wall-mounted cabinets allow for safe wiring, they are mainly designed for installation in wooden houses or on walls where it is problematic to make a niche. Built-in boxes fit perfectly into the interior and are used in emergency exit corridors.

If you plan to purchase an apartment built-in electrical panel, then you should find out the issue with the installation of an electricity meter. Since the consumer does not have the right to turn off and switch the meter, an electrician will need to be called before transferring it to the box. To avoid this, you can purchase a small box for your home. On average, a box designed for 12 modules is enough for a three-room apartment, taking into account the fact that the introductory machine occupies two seats.

In the event of a planned replacement or transfer of the meter, you can buy a combined cabinet. The location of all distribution elements in one place will look more harmonious. At the same time, it will be more convenient to switch between them. It is desirable that there is a slot in the closing door through which it is convenient to take readings from the metering device. It is even better if the electrical panel is equipped with a transparent door. It will allow you not to open the box every time to assess the situation. circuit breakers.

For domestic and administrative buildings, the protection class of the shield must be at least IP31, for industrial buildings - IP54. street shield, located in an open area, must have a protection class of IP55 or higher. The dimensions of the electrical panel depend on the types of modules installed in it and their number. Most often, fixtures with a depth of 120 mm are selected for the home.

Mounting and assembly

The assembly of the external or internal structure does not fundamentally differ from each other. But in the second case, it is first necessary to make a niche to which the slotted channels for laying the electrical wire will fit. . Any electrical cabinet consists of several parts, which include:

• shield base;
• a place for laying an electric cable with its holders;
• racks for mounting terminal blocks;
• din rail.

Depending on the model, a door, a protective overlay or a lock can be added.

Direct installation consists in mounting the box in the place intended for it. But before that, depending on the side of the cable factory, a plug breaks out in the shield. Electrical wires are inserted into the hole formed. The outdoor box is hung on a pre-installed bracket. There are also models that are fastened with screws, for this they are screwed through the back panel into the installed dowels.

The inner box for electric machines is inserted into a niche and fixed using solutions on plaster base. Before fixing it, pass all the wires through the prepared holes. As soon as the cabinet is fixed, the installation of electrical appliances begins.

First, screw the DIN rail and the electric meter, if its installation is provided. Then grounding and zeroing tires are installed. Circuit breakers, residual current devices (RCDs), differential circuit breakers and other protective equipment are put on the rail. Installing them is easy thanks to a specially spring-loaded latch that firmly presses the electrical fittings to the DIN rail. As long as the fixing screw is not tightened, the device to be installed can be easily moved in a horizontal direction.

As soon as everything necessary appliances will be placed, move on to connecting the wires. To perform these steps without errors, it is convenient to use a pre-compiled wiring plan. When switching, it is recommended to observe the color of the wires. So, a wire is connected to the zero bus of blue color, grounding is done in green, and brown is used as a phase.

Switchboard models are not tied to manufacturers of modular elements, for example, a Hager electric machine can be installed in an ABB case without any problems. Therefore, their functionality is determined by the ease of mounting and protection class. Among the many manufactured products, some models are especially popular for installation in apartments. But if in industrial buildings the main criterion is reliability, then in apartments it is aesthetics.

For hidden installation it is recommended to purchase the Hager Cosmos VR118TD shield. Its door is made of transparent plastic, if desired, it can be easily removed from the hinges. Opening direction - up. The box is completed with grounding and zero busbars made of brass. The degree of protection corresponds to IP 31. The number of installed modules is eighteen. This shield is beautiful appearance, ease of installation and low price.

If you need an external shield, you can purchase the VIKO LOTUS model. This inexpensive model will be especially relevant for residents of Khrushchev. It allows you to place twelve modules. The set contains tires, all necessary fasteners and din rail. The white color of the product and its darkened door are suitable for any interior.

Building a power supply system without the use of electrical panels is almost impossible. Their installation not only makes it convenient to turn on and off the power supply on certain lines, but also increases the safety of using the power grid as a whole. At the same time, boxes for placing meters and electrical modules are different placement and they can be matched to any interior.

Hello dear friends and colleagues! We present you assembled and ready for shipment outdoor electricity metering board with degree of protection IP54 for installation on a pole or support.

Purpose of control room

Outdoor electricity metering board is designed for electricity metering and protection of electrical equipment against overloads and short circuits on the outgoing line in networks with a solidly grounded neutral at a voltage of ~ 380/220 V alternating current frequency 50 Hz.

Further, "Street metering board" ...

Street metering board designed to be mounted on a pole or support, also, it can be mounted on outer wall building. The electrical panel has a degree of protection IP54 - thereby protecting the electrical equipment installed inside the electrical panel from dust and moisture.

Design features of the switchboard

Electrical panel housing made of sheet metal and has a mounting plate for mounting a single or three-phase meter, as well as circuit breakers to protect electrical equipment from overloads and short circuits.

• On the back wall The case has four independent fasteners for mounting the electrical panel on the wall - thus: the degree of protection IP54 is not violated!
• The metering board has a protective panel from accidental contact with current-carrying parts of the outgoing line.
• On the door The electric power metering board has a viewing window for taking readings from the electric meter.

Appearance

Conditional elements on the diagram

Designation	Name of installation equipment	Quantity
QF1	Automatic switch 3P. 50A	1 PC.
PI1	Counter electrical energy Mercury 231 AT-01 two-tariff 3-phase 5(60)A 50Hz	1 PC.
SF1	Automatic switch 3P. 32A	1 PC.
SF2	Automatic switch 3P. 20A	1 PC.
SF3	Automatic switch 3P. 10A	1 PC.
XS1	220 V DIN rail socket with earth	1 PC.

In fact, the metering cabinet was made to order according to an individual electrical diagram. If you need a slightly different configuration and complete set of the electrical panel - call us! or send us an application with an attached electrical diagram, through the application form on our website.

We don't want to offend anyone!

These examples are only here so that you can compare our build quality with the quality of other switchboard assemblers!

How do you like the quality? liked? want a little cheaper? like third party manufacturers recent photos, alas ... We do not know how to collect!