After this, it is necessary to relieve the voltage by changing the position of the switch on the circuit breaker.

After making sure that the phases have been removed, we dismantle the old electric meter.

The difficulties that may arise when installing a new meter are related to how different the manufacturers and models of the old and new meters are, and at the same time their shapes and dimensions.

We perform a preliminary fitting of the new meter, placing it within the perimeter of contact between the surface (wall) of the mounting and the body of the electric meter itself. It is important here that the side mounting holes of both of them coincide.

If the preliminary check showed some inconsistencies, we eliminate them by adding suitable mounting holes, extend the wires if the terminals of the new meter are located a little further, etc.

Now that everything fits together, let's start connecting. The connection sequence is as follows (from left to right): the first wire is phase A (input), the second is its output; the third is the input, and the fourth is the output of phase B; similarly - the 5th and 6th wires, corresponding to the input and output of phase C, the last two - the input and output of the neutral conductor.

Further installation of the electric meter occurs in accordance with the instructions supplied with it.

Among the precautions, which, considering the seriousness of the consequences, should be strictly adhered to, the main place is given to the taboo on any kind of amateur activity - the creation of unintended jumpers; actions that may lead to disruption of normal contact, etc. It is necessary to carefully ensure that the wires are well stretched.

It should be remembered that the meter can only be connected by a qualified electrician who has permission to carry out such work. After installation is completed, the meter will be sealed by a specialist.

Video about the practice of connecting a three-phase meter

In conclusion - briefly about the main points

• The advantage of single-phase meters is the simplicity of their design and installation, as well as ease of use (taking phases and readings)
• But three-phase ones have the highest accuracy of readings, although they are more complex in design, have large dimensions and require a three-phase input.
• Allows you to save money. Thanks to tariffs such as day and night, from 11 pm to 7 am you can use up to 50% less energy than with the same load, but during the day.
• Possibility to select accuracy class. Depending on whether the purchased model is intended for use in a residential area or in an enterprise, there are items with an error of 0.2 to 2.5%
• The event log allows you to notate changes regarding voltage dynamics, active and reactive energy and directly transmit them to a computer or the corresponding communication center
• The presence of a built-in electric power modem, with the help of which indicators are exported via the power network.

In this article I decided to consider in detail the connection diagrams for single-phase and three-phase meters.

To begin with, we must immediately say that electric meters can be of several types of connection - direct (direct) connection, through current transformers, through current transformers and measuring voltage transformers. In everyday life, the vast majority of meters, whether single-phase or three-phase, have a direct connection circuit. This is due to the fact that the value of the load current does not exceed 100 A. If the value of the flowing current is more than 100 A, a semi-indirect connection circuit with current transformers is used. The indirect connection circuit with current transformers and voltage measuring transformers is used in networks of 6 (10) kV and higher, so it is not considered in this article.

Electric meter direct connection diagram

Connecting a single-phase electric meter

The most common and simplest scheme for direct connection of a single-phase meter. Almost all single-phase meters are connected precisely according to this scheme; very rarely a semi-indirect connection scheme can be used.

The first terminal of the meter receives a phase wire. From the second terminal the phase goes to the load. The neutral input is connected to the third terminal, and from the fourth the neutral wire goes to the load.

The meter connection diagram is always indicated on the back of the cover covering the terminal block.

Connecting a three-phase electric meter

The connection diagram for a three-phase direct-connection meter is not very different from that of a single-phase one.

Phase A (yellow) comes to terminal 1. From terminal 2, phase A (yellow) goes to the load. Phase B (green) comes to terminal 3. From terminal 4, phase B (green) goes to the load. Phase C (red) comes to terminal 5. From terminal 6, phase C (red) leaves. Terminals 7 and 8 - neutral wire.

When connecting, it is important to observe the correct phase rotation and color coding.

Schemes for semi-indirect connection of an electric meter

As I said above, semi-indirect connection through current transformers is used if the load current exceeds 100 A. In this circuit, current transformers are designed to convert the primary load current to values ​​that are safe for its measurements. Such schemes are more complex than direct connection and require certain knowledge and skills.

When connecting the meter through current transformers, it is necessary to observe the polarity of the beginning and end of the transformer windings, both primary (L1, L2) and secondary (I1, I2). The common point of the secondary windings of transformers must be grounded.

Scheme with connection of current transformers to the “star”

Phases A, B, C come to terminals L1 of the primary winding of current transformers TT1, TT2 and TT3. Terminal 2 of the meter is connected from L1 TT1, terminal 5 of the meter is connected from L1 TT2, and terminal 8 of the meter is connected from L1 TT3. Terminals L2 of all CTs are connected to the load.

Terminal 1 of the meter is connected to the beginning of the secondary winding I1 of TT1, terminal 4 to contact I1 of TT2 and terminal 7 to contact I1 of TT3. Terminals 3, 6, 9 and 10 are connected to each other by a jumper and connected to the neutral wire. All ends of the secondary winding I2 are also connected to each other and connected to terminal 11.

In circuits with an isolated neutral, a circuit with two current transformers (partial “star”) is used.

Ten-wire connection diagram

This diagram is visually more clear than the star connection diagram.

In this circuit, phases A, B, C come to terminals L1 of the primary winding of current transformers TT1, TT2 and TT3. Terminals L2 of all CTs are connected to the load. Terminal 2 of the meter is connected from L1 TT1, terminal 5 of the meter is connected from L1 TT2, and terminal 8 of the meter is connected from L1 TT3.

The beginning of the secondary winding I1 of TT1 goes to the 1st terminal of the meter, and the end of the I2 winding goes to the 3rd terminal of the meter. The beginning of the secondary winding of the transformer I1 TT2 comes to the 4th terminal, the end of I2 comes to the 6th terminal of the meter. On terminal 7 - the beginning of I1 of transformer TT3, on terminal 9 - the end of I2 of TT3. The neutral conductor goes to the 10th terminal of the meter as a separate wire, and from the 11th terminal it goes to the load.

Connection diagram of a three-phase meter through a test terminal box

In accordance with the current Rules for the Construction of Electrical Installations - PUE (section 1, clause 1.5.23), electrical energy metering circuits must be connected to special terminals or test boxes.

The test transition box is used to connect three-phase induction and electronic meters, providing short-circuiting of the secondary circuits of measuring current transformers, disconnecting the current circuits and voltage circuits in each phase of the meters when replacing them, as well as turning on a reference meter for verification without disconnecting the consumption load.

Connection diagram via test terminal box

Selection of current transformers

The rated current of the secondary windings of the transformer is usually selected 5A. The rated current of the primary winding is selected based on the calculated load, taking into account operation in emergency mode.

According to PUE 1.5.17, the use of current transformers with an increased transformation ratio is allowed:

It is allowed to use current transformers with an increased transformation ratio (according to the conditions of electrodynamic and thermal resistance or busbar protection), if at the maximum load of the connection the current in the secondary winding of the current transformer is at least 40% of the rated current of the meter, and at a minimum operating load - at least 5 %.

For example, an electrical installation in normal mode consumes 140A, the minimum load is 14A. We select the measuring transformer 200/5. Its transformation coefficient is 40.

140/40=3.5A– secondary winding current at rated current.

5*40/100=2A– minimum secondary winding current at rated load.

From the calculation it is clear that 3.5A >2A– requirement fulfilled.

14/40=0.35A– secondary winding current at minimum current.

5*5/100=0.25A– minimum secondary winding current at minimum load.

As we see 0.35A>0.25A– requirement fulfilled.

140*25/100=35A current at 25% load.

35/40=0,875 – current in the secondary load at 25% load.

5*10/100=0.5A– minimum secondary winding current at 25% load.

As we see 0.875A>0.5A– requirement fulfilled.

From this we conclude that a current transformer with a transformation ratio of 200/5 for a load of 140A is selected correctly.

When taking readings from a meter with current transformers 200/5, you need to multiply the meter readings by 40 (transformation ratio) and get the real electricity consumption.

The choice of CT accuracy class is determined in accordance with PUE clause 1.5.16 - for technical accounting systems, it is allowed to use CTs with an accuracy class of no more than 1.0, for settlement (commercial) accounting - no more than 0.5.

All existing models of electricity meters are designed to perform one main function - they measure the amount of electricity consumed by the consumer. As a rule, specially trained people are hired to install electricity meters. But if you really want to, you can install such a device yourself. You just need to thoroughly understand the connection diagram and follow the instructions in everything.

Remember: only you are responsible for all possible consequences of unauthorized installation of accounting equipment.

Types of meters and their key features

There are two main types of meters on the market: induction and electronic. They differ in their mechanism of action and measurement accuracy.

Induction models are rapidly being forced out of the market. The government is actively promoting this. The main disadvantage of devices in this category is that they are very easy to “deceive”, which unscrupulous consumers happily take advantage of.

Electronic meters are more versatile, compact and accurate. An additional advantage of modern models is the ability to configure them to work in . This point is especially relevant for consumers living in regions with different tariffs for daytime and nighttime.

Thus, when choosing for self-installation, it is strongly recommended to give preference to modern electronic models.

Additionally, meters are classified according to indicators such as accuracy class and rated current. The smaller the meter class number, the more accurately it works.

The required rated current is determined individually. To calculate, check with your local energy sales office for the permissible active power indicator established per consumer. This number must be divided by 220V or 380V depending on the voltage of your electrical network.

For users connected to a three-phase network, a higher active power threshold is usually set, however, using a three-phase connection in everyday life is not entirely advisable.

Important! If the meter is connected to buildings for which the calculated current value exceeds 100 A, current transformers are additionally installed. Directly “embedding” the measuring device in such conditions will not work.

In such situations, it is important to take into account that the inclusion of intermediate elements in the circuit can negatively affect the accuracy of accounting, so planning a transformer circuit must be approached with knowledge. To do this, it is better to contact a qualified specialist.

When choosing a meter, be sure to pay attention to the integrity of the seal and how long ago it was installed. You will find the seal on the screws of the meter casing. The maximum permissible limitation period for installing a seal for single-phase devices is 12 months, for three-phase devices - 24 months.

Prices for electricity meters

Self-connection of the meter: what does the law say about this?

To avoid problems with the energy sales service, first contact its local representative to conclude an agreement and obtain the necessary permits to carry out the planned work.

An employee of the mentioned service will give you documents that, among other things, will detail the requirements that must be observed before and during the installation of the electric meter.

The law requires that meters connected to private houses be installed outside the residential premises. This is done so that, if necessary, an energy sales service employee can gain access to metering equipment. The law obliges apartment owners to install metering devices in a common panel, located, as a rule, on the landing.

Studying the meter connection diagram

We will not consider complex connection options - we will leave them to professionals, because... Without the appropriate skills, it is unlikely that you will be able to cope with such work on your own.

The simplest option is . It is performed using a maximum of 6 cables and load. The ground, phase and neutral wires are connected to the input of the meter. Similar wires are connected to its output.

An automatic switch is installed in front of the meter. This is done for greater safety and ease of use. A small device will independently disconnect a house or apartment from the power supply if any kind of dangerous situation occurs.

To avoid problems with the energy sales service, be sure to seal the switch. To do this, we use a basic kit consisting of a mounting DIN rail, a seal and a plastic box.

The design of a typical electric meter includes a bus. This product is made in the form of a copper strip. Dielectric clamps are used to secure it. A number of holes are made along the length of the bus for supplying electrical cables and their subsequent fastening. This connection method is relevant when it is necessary to combine several separate wires into one cable.

Meter installation: basic rules and requirements

We install the electric meter in strict compliance with the approved rules. First of all, we study the safety requirements for the operation of electrical equipment of any type and purpose.

1. We install the meter at a temperature not lower than +5 degrees. Accounting equipment, like any other electronics, does not withstand exposure to cold.
2. When installing the meter outdoors, we build a sealed heated cabinet for it. All materials and equipment necessary for this are sold in specialized stores.
3. We mount the electricity meter at a height of 1-1.7 m above the base. If the device is placed lower, it will simply be inconvenient for you to watch the readings.

Step-by-step instructions for installing the meter

First of all, we prepare the kit for work. We will need the following:

• counter and shield;
• installation tools with pre-insulated handles;
• insulators;
• switches (automatic);
• wires;
• fasteners (screws and nuts);
• voltage meter;
• DIN rails.

First step

Let's find out whether our electrical network is single- or three-phase. We calculate the required number of switches.

Second step

We install the metering device into the body of the protective shield. Fastening is carried out using special clamps from the kit.

Third step

We install switches. We will attach them to the DIN rail with a special spring-loaded latch. We first fix the rail itself with screws to the support insulators.

Fourth step

We install grounding and protective busbars. We attach them to a DIN rail or insulators in the body of the protective shield. We fix it with screws and nuts. We place the buses at such a distance that the possibility of shorting the wires is excluded.

First, we connect the load to the switches, then we connect it to the meter, and only after that we connect the meter itself.

Fifth step

We connect the loads. We connect the phase to the lower terminals of the switches, connect the zero to the zero bus, and connect the ground wire to the ground bus.

Sixth step

We install jumpers connecting the clamps on top of our machines. Jumpers are sold in specialized stores. We first buy the required number of jumpers according to the number of machines.

Seventh step

We connect the electric meter to the load. To do this, we connect the “phase” output (which is the third terminal of the metering device) to the upper terminals of the machines. Next, we connect the “zero” output (represented by the fourth terminal of the metering device) to the zero bus.

Eighth step

We fix the body of the electric meter panel on a wall or other suitable flat base. Maintain a comfortable height.

Ninth step

We find phase, zero and grounding. If there is no grounding, we check each core with a special indicator. This simple device will help us find the phase. If there is a ground connection, you will easily recognize it - usually this wire is painted or marked green.

Tenth step

We turn off the electricity supply to the house or apartment.

Eleventh step

We connect the zero wire to the third terminal of the meter, and connect the phase cable to the first terminal.

Twelfth step

We check the operation of the electric meter at idle, and then gradually apply the load.

Thirteenth step

We contact the local energy sales office for additional checks and sealing of metering equipment.

At this point, the work of manually installing and connecting the electric meter is completed.

Congratulations, you have successfully completed all the activities and saved money on the services of third-party installers!

Find out how to do this, and also consider how to plan and calculate an electrical network from our article.

Video - Electric meter connection diagram

After installing the wiring in the house, it is necessary to connect the electricity meter according to the diagram corresponding to the specific model of the device. An electric meter is designed to measure the amount of electricity consumed by a consumer. The installation of the electric meter must be carried out as competently as possible so that a short circuit does not occur later. It is recommended to entrust all the work to specialists; not everyone can do it themselves.

and their features

There are several types of devices:

1. Operating on direct and alternating current.
2. Three-phase and single-phase.
3. Single-tariff and multi-tariff.
4. By type of mechanism we can distinguish the following: electronic, hybrid, mechanical. Hybrid electricity meters are most often used; how to connect it correctly will be discussed further.
5. Switching on meters using direct and transformer methods.

Today you can find electronic and induction devices on the market; they have different mechanisms of action and measurement accuracy.

Induction and electronic models

Before you properly connect the electric meter, you need to decide what type you need. The obsolete ones have been practically replaced in recent years thanks to government assistance. They have a big drawback - they are simply deceived. Unscrupulous consumers of electricity take advantage of this and “wind back” the dial.

Electronic counters are universal and have high measurement accuracy. They can be easily configured for use in multi-tariff modes. Therefore, if you live in a region where there is a day and night tariff, it is better to give preference to an electronic meter. In this case, you can save on electricity.

Classification of meters

Depends on how many phases it is designed for. Do not use single-phase meters. To calculate the rated current, you need to find out what active power standard per person is established in your locality. Then this value must be divided by the household voltage (380 or 220 V).

Classification of the meter by accuracy: the higher the number defining the class, the higher the measurement error. In the event that the device is connected in a building in which the total current consumption is over 100 A, it is necessary to install special current transformers. Otherwise, it will not be possible to install an electric meter. But it is not recommended to install such systems yourself. It is necessary to contact qualified specialists. And when purchasing a metering device, you need to make sure that there is a seal on it. Make sure it is installed no later than one year (for single-phase appliances) and two years (for three-phase appliances).

Legality of self-connection

To avoid problems with energy sales, you must contact your local office in advance and conclude an agreement. You must obtain permission to carry out the planned work. Energy sales employees must give you documents that list all the requirements and a diagram for connecting the electric meter. The step-by-step installation instructions must be studied in advance; it is advisable to print them out and keep them with you at all times.

The law requires that electric meters used to record energy consumption in private homes be installed outside the residential premises. This is necessary so that any energy sales employee can gain access to the device. In apartments, electricity meters are installed on the landing.

Single-phase meter connection diagram

Now let’s look at what types of connection diagrams there are for electricity meters. The simplest option is a single-phase connection, which is made using six wires. Three wires are connected to the input of the metering device:

• zero;
• phase;
• grounding

The same exact wires are connected to the output. It is advisable to install a circuit breaker in front of the meters to increase the safety of the home and the operation of the power supply system. If necessary, one small device can de-energize the entire apartment or house.

Of course, one may wonder: won’t energy sales employees be able to “punish” for such installation? To prevent this from happening, it is necessary to seal the circuit breaker. The design of the electric meter has a busbar - a copper strip secured with dielectric clamps. With this connection method, you can connect several wires of a small cross-section into one larger one.

Requirements and rules

To install two-tariff electricity meters (their connection diagram is almost the same as that of single-tariff ones), you must adhere to the following requirements:

1. should be carried out at temperatures above +5 degrees. It must be remembered that any electronics are adversely affected by cold. And it’s much more convenient to work in the warmth.
2. If you need to install the meter outdoors, build a heated, sealed cabinet for it. All materials that may be required for this can be purchased at specialized stores.
3. The device is installed at a height of 1 to 1.7 m above the ground or floor. If the device is located lower or higher, taking readings from it will be problematic.

These are the basic requirements; you can find out more about the rest from your energy supervision representative.

Installation materials

First of all, it is necessary to select a connection diagram for the electric meter. Installation should only be done after you have all the necessary materials available:

• sealed panel and electric meter;
• circuit breakers designed for maximum current;
• insulators;
• tools with insulated handles;
• fastening accessories - nuts, screws;
• DIN rail;
• wires.

Step by step guide

Make sure that the electricity meter connection diagram you choose is suitable for the network.

The first step is to find out how many phases are in your network. Based on this, you can calculate the required number of circuit breakers. Further steps for installing the electric meter:

1. Install the metering device in the panel; fastening is done using special clamps.
2. You mount the circuit breakers; they are mounted on a rail and secured with a latch.
3. The rail is fixed with screws to the insulators in the panel.
4. When installing the protective and grounding buses, they must be attached either directly to the rail or to the insulators that are located in the protective shield. The busbars must be located at a sufficient distance to eliminate the possibility of a short circuit. First you need to connect the load to the switches, only after that the machines are connected to the meter. At the last stage, the metering device is connected to the network.
5. Connect the load.
6. Install jumpers connecting the machines.
7. Connect the electric meter to the load (electricity consumers).
8. Attach the shield body to the wall.
9. Check that all wires are connected correctly. Only after this should food be supplied to the house or apartment.

If the connection diagram for the electricity meter is chosen correctly, then no additional actions will have to be performed. All you have to do is contact the energy sales office so that specialists check all the equipment and install their seals.

An electric meter is a special device whose main function is to measure the amount of electrical energy consumed. The history of these devices begins in the 19th century, when technical means that consumed electricity were invented and began to be actively used.

The structure of electricity meters looks like this:

1. The main mechanisms are the voltage coil and a current coil.
2. Electromagnets of the indicated coils are positioned in such a way that they can be located at an angle of 90° relative to each other.
3. In the space between coil electromagnets a special aluminum disk is placed. It is fixed at the bottom and top using bearings and thrust bearings.
4. The axis of the aluminum disk is equipped with a special worm, which, thanks to the presence of wheels with teeth, allows the drum of the counting device to function, setting it in motion.

The principle by which any type of electricity meter operates can be described by the following order of actions:

1. Current coil has a sequential connection to the electrical circuit system. It consists of a small number of turns, and winding occurs with a wire with a large diameter.
2. Second coil, on the contrary, has a parallel principle of connection to the electrical circuit. Its number of turns is much greater than that of a current coil, and winding occurs using a thin wire.
3. AC voltage e during operation is transferred to only one element of the meter - a coil with a large number of turns and a thin wire.
4. When voltage passes through the coils, then magnetic fluxes of alternating type immediately appear in the space between them.
5. Thanks to the generated flows between the coils, the aluminum disk creates special current vortices inside itself.
6. Vortexes and flows meet in an aluminum disk, interacting with each other, which causes a rotational effect in relation to the disk itself, and it begins to move.
7. The counter records all disk revolutions for a certain set period of time, counting and taking into account the consumed electricity.
8. Modern models of electricity meters carry out this process by converting analog signals that were received by sensors into a pulse code, which is a set of numbers. The microcontroller is able to decipher this code after it is received, as well as calculate and display the resulting value of the amount of electricity consumed.

Preparatory work

It is possible to carry out the process of connecting such a meter to the network yourself, without calling a qualified electrician. However, before proceeding with this, it is necessary to first carry out preparatory work on the installation of a special box, inside of which the electric meter itself will need to be installed.

To ensure correct installation technology, you need to adhere to the following algorithm of actions:

1. On a wall box all bolts or screws holding the cover in place are unscrewed, after which it is removed.
2. Boxing is installed on the wall, and the height of its installation should be in the range from 0.8 to 1.7 meters. This parameter is subject to the current official safety regulations for working with high voltage.
3. Selection of elements for fasteners carried out based on the material from which the wall is made.
4. Wall mounted box will have several mounting rails, as already mentioned, and a zero bus.

In fact, all modern meter models are representatives of the modular variety, so their connection type is unified: it is made on a mounting rail. Their advantage is not only the use of absolutely safe and non-flammable materials in their own structure, but also the significant ease of understanding and implementation of installation technology.

Required materials and tools

Preparing in advance the tools and materials that will be required to connect the meter is also one of the parts of the preparatory work.

You need to prepare in advance:

• electrical panel, which must comply with all the parameters and features of the installed meter;
• the electricity meter itself, you can choose induction or the most common electronic option;
• several wires with different diameters from 1.5 m to 6 mm;
• slats with a recommended width of 0.35 cm;
• materials and tools for fastening;
• insulating elements;
• insulating tape;
• knife with a sharp blade;
• screwdrivers various types;
• pliers;

An important condition on which the safety of the person installing and connecting the electric meter depends is that all selected tools must have an insulating rubber handle to avoid electric shocks.

Installation

If all the preparatory work is left behind, and the necessary tools and materials have been prepared and meet all the requirements for them, then you can proceed directly to installing the electric meter:

1. PUE gives an order, according to which, the installation of the meter must be preceded by the installation of protective equipment that can protect against various emergency situations. Such a protection device can be placed in different places: the base panel, on the staircase, near the electric meter itself. The choice of location depends on the capabilities of installing seals on the equipment.
2. After installing the protective equipment, we can return to the issue of installing the meter. Initially, a two-pole circuit breaker must be installed. Using a special mechanism on the reverse side, it can be fixed to the top rail inside the box.
3. The electricity meter itself is installed. It has exactly the same mechanism on the reverse side as the circuit breaker, so it is connected to one of the DIN rails using the same principle.
4. Next, you need to add single-pole circuit breakers. Their number may vary, but most often two machines are installed on each meter.

At this point, the process of installing the electric meter is completed and, as you can see in practice, there is nothing complicated about it.

Connection

The algorithm of actions that must be performed when connecting an electric meter directly depends on its type.

So, to connect a single-phase meter you need:

1. At the initial stage, completely turn off the machine or plugs, or de-energize the entire line while working on connecting the device.
2. On the back of any single-phase electric meter there is a diagram, according to which it must be connected.
3. Connect the wires to the contacts on the terminal strip That is, a single-phase device has four terminals in total.

The connection order must be as follows (if you look at the meter from left to right):

1. Input of phase to the apartment from the network.
2. Phase output indoors.
3. Entering zero to the apartment from the network.
4. Output of the zero insulator into the room.

Three-phase electricity meters are divided into several types: devices of direct or indirect connection, respectively, the technology of this process differs between them. Indirect connection devices will not be considered, since they are prohibited for installation in residential buildings.

Such devices are used exclusively for industrial purposes, and their installation and connection can only be carried out by qualified craftsmen and electricians who have such access.

If we talk about direct connection electricity meters, they are suitable for installation in residential buildings; the connection algorithm is not so significantly different from the technology used for single-phase models. But taking into account the fact that the circuit of three-phase devices is much more complicated, it is recommended not to connect them yourself, but to entrust this process to a professional electrician.

This is also due to the fact that the registration of a new device must still be carried out by a specialized organization, which will provide a technician who has a license and permission to carry out various electrical installation work.

Description of connection diagram

If we talk about the single-phase variety of electric meters, their connection diagram is the most elementary and is traditionally indicated on the back of the device cover.

If it is still missing, then you can use the following description of the correct connection of the wires:

1. To the first terminal on the left, includes the phase leading from the external network to the residential premises.
2. Via the second terminal, this phase is brought inside the apartment.
3. Third terminal brings zero from the network.
4. Via last contact, located on the right, zero has access to the apartment.

The connection diagram for a three-phase electric meter is somewhat more complicated, but it is also most often given on the back of the device cover or in the device’s operating instructions. The most important thing in this process is not to confuse the wires and keep track of the order in which they are connected, based on color.

Also, it is important to remember that all odd pin numbers will correspond to the input, and even numbers indicate load.

The correct connection diagram for a three-phase device will look like this:

1. Yellow wire connected to the input, corresponds to phase A.
2. Second yellow wire connected to the output, corresponds to the same phase.
3. Green wire for phase B input.
4. Second green wire should be connected in the same way as the first one of the same color.
5. Red wire connected to the input of phase C.
6. Second red wire must be connected to the output of the same phase.
7. Blue wire corresponds to the neutral conductor, it is connected to the input.
8. Second blue wire also corresponds to zero, but is connected to the output.

All wires of three-phase meters have exactly the same numbering, so if you strictly follow the description given, the device will be connected correctly.

How to connect machines?

Connecting machines is not as complicated as, for example, a three-phase meter, so anyone can implement it by following the algorithm below:

1. In the electrical panel, the circuit breaker is mounted using a built-in snap mechanism onto a DIN rail in the box.
2. Wires are inserted into clamps and are subject to reliable fixation using special bolt contacts.
3. Contacts must be tightened securely, but carefully so as not to damage the body of the device, which will cause subsequent displacement of the internal elements, and this will lead to frequent overheating during operation and in the near future will contribute to the breakdown of the switch.
4. Input power must be connected strictly from the top of the machine, and the load or output is connected from the bottom.
5. Even before connecting the cable to the terminals, it must be freed by 15 cm from the outer insulating layer to add flexibility and mobility. Internal insulation can only be removed by 0.5-1 cm.
6. When connecting to a circuit breaker, the wire For small cross-section or multi-core cables, special lugs are used for them during the installation process.

What happens if the electric meter is connected incorrectly?

Incorrect connection of this device or its protective equipment may result in the following undesirable consequences:

1. Occurrence of a short circuit, combustion of all ungrounded electrical appliances.
2. Overheating of the equipment itself, which will disable it in the shortest possible time.
3. Responsible organization for inspection, most likely, will introduce penalties for spontaneous incorrect connection of the device, especially if there is no seal on it.