Interverification interval (MPI) of electricity meters - table of timing for verification of electricity meters in Russia by model

What is MPI and is it necessary to verify electricity meters by law?

Inter-verification period (ICP) is a period of time after which the consumer needs to check the electric meter. If this requirement is ignored, the IPU goes into the “non-working” category, and the readings transmitted from it cannot be accepted for settlement transactions.

Each type of device has a separate interval within which the information is recognized by the power supply organization as relevant. With regard to resource consumption, verification in apartment buildings and private households, it is necessary to rely on the following regulations - federal laws No. 102 and No. 261.

However, from June 1, 2020, premises owners are exempt from the need to:

• use IPU;
• transmit information about metering devices when they fail;
• install equipment.

Due to its malfunction or the end of the inter-verification period, the RSO or service company is obliged to restore the resource supply by installing a new device.

Watch the video: “What to do if the verification period for the electric meter has expired. How to avoid fines."

How to check if the electric meter is working correctly

For the sake of curiosity, you can check how accurately your meter measures electricity consumption with your own hands and at home. But such an experiment, of course, cannot be considered a verification.

So, to carry out such a test, you will need access to a meter, an incandescent light bulb as a load, a multimeter, a calculator and a stopwatch. The order of your actions will be as follows:

1. Measure the voltage (U) in the network using a multimeter.
2. With the multimeter in ammeter mode, measure the current (I, A) in the light bulb.
3. Calculate the resistance of the light bulb R=U/I, Ohm.
4. With the light bulb plugged in, measure how long it takes (T, hour) for the counter to blink (turn the dial) 10 times. At the same time, it is necessary to monitor the voltage in the network.
5. On the front panel of the metering device its so-called constant is indicated (A, imp/kWh). Find this number.
6. Calculate the actual power consumption P=UxU/R, W.
7. The error of the electricity meter (D) is calculated based on preparatory calculations using the following formula: D= (PxTxA-1)x100%

Below is a video about checking your electric meter yourself when you have doubts about its readings:

Who should carry out scheduled verification

Verification of electricity meters without removal is carried out by special enterprises:

1. State The metrological institution is authorized to carry out diagnostics of all types of meters.
2. Private companies analyze and evaluate the electricity consumption monitoring device subject to certification. A license can be requested before concluding a contract. The document is issued by the Federal Service.
3. Organizations serving an apartment building, if there is a certificate of admission to these types of services.

When a citizen applies for diagnostics to a non-state enterprise, it is necessary to check the accreditation certificate for expiration date. Concluding a contract for the provision of services is a mandatory condition. In this case, the text of the document must include information that the company will carry out interval verification of the electricity meter. If you refuse to prescribe such a clause, experts recommend turning to another contractor.

The apartment owner also needs to take into account that in most cases the procedure is carried out with the removal of equipment. In view of this, the owner of the premises is obliged to send a notification to the management company or RSO about the upcoming work, since during this process the seal is destroyed. Such actions are allowed to be carried out only after the official recording of the testimony. Otherwise, the enterprise or management company has the right to review the procedure for calculating fees for the consumed resource during the specified period.

How to find out the verification period for an electricity meter.

Where to go to check the device

To call an employee, you need to go to the metrology laboratory department, which is accredited. The location can be found in an organization that monitors electricity consumption. The person who owns it must bring the electric meter in order to carry out the test. Energy sales will notify you about how long it will take. If a person is not sure that the device shows accurately, he can check his equipment himself and not wait until scheduled diagnostics occur. In this case, the owner of the electrical equipment can select the service himself.

Contacting the local metrological organization as necessary for equipment verification

How to find out the verification period

You can determine the expiration date of the verification interval through the meter’s data sheet. Russian legislation establishes that correct accounting of the use of a resource is possible only if there are technical documentation or a certificate. These papers confirm that the device complies with state standards.

After verification, information about the date and responsible person, including factory control, is entered into the product passport. The official paper also states when an inter-verification analysis needs to be done. The time depends on the type and model of the device.

As a rule, modern devices need to be checked once every 16 years, old models - every 8.

How to find out the verification period if your passport is missing

If you do not have a technical passport and suspect that the verification period has expired, you must visit the official website of the RSO for the region. The portal contains the telephone number of the Energosbyt branch, by calling which you can find out the necessary information regarding the address of the facility.

Do I need to check a new electric meter?

New electric meters are also subject to state verification for accuracy of data transmission in accordance with the classification of the device. This is due to the fact that single-phase devices should be stored in a factory or store for no more than two years, three-phase devices - 12 months. The expiration date should be checked at the time of purchase.

Main settings

This electricity meter CO 505 is equipped with its own technical characteristics. Among them are:

1. Metering devices of this model operate in a network with a voltage of 220 Volts, at a frequency of 50 Hertz.
2. Direct switching: the energy consumed passes through the metering device.
3. The current load reaches ten Amperes. The highest current load reaches forty Amperes.
4. The lowest current value for the sensitivity of the metering device is 0.05 A.
5. The most significant digit of the counting device reaches ten thousand kilowatts in one hour.
6. The least significant digit of the counting device reaches 0.1 kilowatt in one hour.
7. The numbers change by one kilowatt per hour after the disk makes six hundred revolutions.
8. This device can operate at one hundred and twenty percent of the maximum current values ​​for four hours.

In addition, there are different power values ​​that a given model needs to operate.

In a voltage circuit:

1. At full power 4.5 Volt-Amps.
2. With an active power of 1.3 Watts.

In a circuit with current:

1. At full power two and a half Volt-Amps.

In total, the meter weighs a little more than one kilogram. If we talk about the accuracy range, it varies from 175 to 255 Volts.

Please note that this device can operate at temperatures ranging from minus twenty to plus fifty-five degrees Celsius.

Types of verifications - table

According to Gosstandart, the electric meter verification period is presented in three types:
Table 1.

Frequency of verification of electricity meters in Russia by model - table

The frequency of MPI is set at the factory and calculated depending on the type of mechanical device. Most often, devices are provided with an interval of 6-16 years. More precise deadlines are specified in the technical data sheet of the product, endorsed with the manufacturer’s seal. A seal installed on the device body serves as confirmation of the verification of the IPU.

The MPI depends on the characteristics of the equipment used. The regulations regulate the frequency of control for induction mechanisms - no more than 8 years, for electronic devices - a maximum of 16.

The calibration interval of electric meters in the table is presented depending on the brand of equipment:

Table 2.

It is noteworthy that the population pays for such procedures on their own, regardless of the form of ownership - apartment or private household. This is due to the fact that the electric meter does not belong to the general property of the apartment building and is not an element of engineering communications. Accordingly, the service organization is not obliged to monitor the operation of the device free of charge. However, such services are cheap for beneficiaries or residents of municipal premises.

Note: when purchasing an electric meter, experts recommend choosing devices no higher than the second accuracy class. In addition, you need to take into account the period during which the factory verification was carried out: three-phase models - up to 1 year, single-phase - 24 months. During calculations, you need to take into account when the IPU will be installed.

General information

The single-phase electricity meter SO-505 is an induction type design and is used to measure consumed electricity. You can install it yourself or with the help of a qualified electrician. The first option is cheaper, but requires some knowledge and skills for such work.

Device and principle of operation

Before determining the connection diagram for the CO-505 electric meter, it is necessary to study its design and operating principle in detail. All this information will help you install the device as quickly as possible and avoid any unforeseen situations.

The counter consists of the following elements:

• Frame. It is an impact-resistant frame made of plastic that does not melt under high temperatures and does not support combustion. In some cases, it is made transparent so that representatives of control services can see illegal changes made to the design.
• Current coil. This element is made of copper wire of small cross-section, designed for the maximum operating current of the device. It is connected in series with the load.
• Voltage coil. Unlike current, it is connected in parallel and can be made with a small cross-section wire.
• Disk. It is made of aluminum and performs the function of determining the amount of electricity consumed.
• Permanent magnet. This design detail allows the aluminum disc to brake.
• Stopping device. This simple detail helps prevent the disc from spinning backwards. All this significantly reduces the likelihood of electricity theft.
• Counting mechanism. Shows the owner of the device a numerical value of the amount of electricity used.

The principle of operation of the CO-505 is quite simple, so not only an experienced electrician can understand it, but also a beginner who sees this device for the first time. This gives everyone the opportunity to correctly install the meter with their own hands.

The operating diagram of SO-505 is as follows:

1. When electricity passes through the windings of current and voltage coils, magnetic fluxes are created.
2. They cross a moving element - an aluminum disk, inducing transformation currents in it.
3. Thanks to this, a torque is generated that is proportional to the power consumption.
4. The rotation of the disk drives the counting mechanism. This is done using a system of drive gears.
5. Its scale displays the amount of electricity used.

You might be interested in Features of assigning group 4 for electrical safety

Advantages and disadvantages

The single-phase electricity meter SO-505 has a number of advantages. Thanks to them, it is valued by consumers and is often installed in residential as well as office premises.

The main positive characteristics of this meter model:

• large margin of technological strength;
• durability (at least 30 years), which is achieved by using wear-resistant parts;
• small error in measurements of consumed electricity;
• the presence of protective mechanisms to prevent illegal theft of electricity;
• high strength of the body, capable of withstanding significant external influences;
• sufficient fire safety of all structural parts;
• sealed housing to prevent the ingress of moisture and foreign objects.

Despite the large number of advantages, the CO-505 meter also has several disadvantages. They must be taken into account before purchasing the device and starting its installation. Otherwise, you may encounter various difficulties that will complicate the installation process and lead to many problems.

Among the shortcomings there are several main ones:

• low accuracy class of the electricity meter SO-505;
• large dimensions that do not allow placing the device in any convenient place;
• unattractive appearance;
• high current consumption by the device itself.

Verification nuances

When installing a device for metering consumed utilities, it is necessary that the owner of the facility trusts the IPU, as well as the RSO. Based on this information, the institution will issue invoices for payment.

Thus, all parties to this process must be confident in the correctness of the transmitted evidence. In view of this, when purchasing and installing a meter, experts recommend finding out about the presence of a certificate and accreditation from the manufacturer. Direct installation should be ordered from authorized companies.

The calibration interval of the electric meter has features depending on the installation location - a private household or an apartment in an apartment building.

Watch the video: “Checking electricity meters. How to save money and time."

In a private house

Often in private households, meters that monitor energy consumption are installed on the street. However, this is not a basis for refusing to provide evidence, verify the IPU or agree with the issued receipts.

It is noteworthy that the more complaints the owner sends to the RSO, the more correctly settlement transactions are carried out. But in order to make claims against the company, you must, on your part, comply with the assigned responsibilities, namely: check electricity meters on time.

In addition, the owner of the house must provide RSO employees with the opportunity to:

• verify readings;
• control the integrity of the seal;
• keep honest records within the framework of the law.

Requirements from RSO are also imposed regarding the location where the electric meter will be located. In particular, they relate to compliance with temperature conditions and humidity levels.

In the apartment

The owner of the apartment is not obliged to independently verify electricity meters. Such procedures are carried out by the RSO or the company servicing the apartment complex, according to the established tariff. Directly taking readings and monitoring the performance of the device is free of charge. Analysis of the technical parameters of the IPU costs money - it takes into account the period and current standards.

At the installation site without removal

Important elements on the electric meter.

Verification of the electric meter without removal is carried out by a device for testing and comparing the measured energy due to the frequency of pulse outputs.

The consumer sends an application to a metrological institution or an accredited company to carry out maintenance of the IPU without dismantling. According to the received request, an employee of the organization comes to the address with the appropriate equipment. Experts recommend submitting an application 1.5-2 weeks in advance to avoid missing the verification interval.

Thanks to the mobility of the system, companies can check without removing the device. The equipment used allows you to analyze resource consumption with an error below 0.01%. The devices used are single-phase and multi-phase, low or high power.

Calibration equipment analyzes the operation of individual elements of the IPU. This allows us to identify the correct distribution of errors among parts of the mechanism. The result of the work is influenced by the ratio of the test load on all meter sensors.

In other words, if the indicators are not the same or have inaccuracies, then there is a significant error in the operation of the electrical appliance. In this case, a malfunction is diagnosed and the owner needs to install a new electric meter.

Electrical panel installation

To install the CO 505 meter, we use an Apartment plastic panel of the ShchK type (I remind you that this is a low-budget replacement option). Here is the lower part of the electrical panel, which is attached to the wall:

Electrical panel for the meter

Self-tapping screws indicate three plastic inserts included in the shield kit, to which the meter will be attached. These inserts move freely (and can fall out freely) in their grooves.

The CO-505 meter on the back has three mounting holes through which it is attached to these inserts:

Rear view of the CO505 electricity meter

Now you need to securely fasten the back panel of the electrical panel to the wall:

Installation of electrical panel for the meter

It is very important that the back panel is secured without kinks, so that later you can put the top cover on it without any problems and that the machines fit smoothly. For installation we use a carrier (powered from neighbors), a hammer drill, 6 or 8 dowels, and self-tapping screws.

Important! The counter must be installed at a height of no more than 180 cm (at eye level). This is a very important requirement from sealers and inspectors. And in general, it is much easier to take readings every month without the help of a stool.

I usually don’t disturb my neighbors, I connect via a two-pole circuit breaker to the existing wires in the apartment, and carefully make the necessary holes for the dowels. This method is also discussed in the article about laying the cable to the meter, see the link at the beginning of the article.

Electric meter verification procedure

The verification period for the electricity meter is controlled by the owner of the apartment or private house. The obligated citizen must independently agree on the date of transfer of the device for diagnostics and deliver the IPU to the address of the metrological center. However, at the legislative level, conducting verification without removal is an acceptable procedure if the contractor has accreditation.

Step No. 1: Analysis of the correct connection of the electric meter

The use of a control device depends on the type of IPU and the number of phases. On the diagram this can be reflected as two connected inputs - zero and phase, as well as the point of connection with the load circuit.

The controller can diagnose problems with the electric meter by identifying additional sources of connection to the network. In the second case, suspicion may be caused by a violation of the connection sequence.

Deviations from the norm are grounds for additional verification, since such cases often indicate theft of resources through unauthorized connection. The correctness of the connected individual energy consumption device is carried out by simple inspection.

Step #2: Self-propelled research

The concept of “self-propelled” meter means circumstances under which the device disk rotates without additional load, i.e., on its own and at the same time all electrical appliances are de-energized. After turning on all the diverter automation, the controller observes the movement of the mechanism for 7-10 minutes.

If the device is working properly, then rotation will not occur, and the indicator will not show more than one pulse. In the opposite situation and a flashing sensor, the procedure ends with re-verification or installation of a new IPU.

Step #3: Gear Ratio

The gear ratio is set on the external panel of the electric meter. The coefficient provides information to the consumer and the RSO about the number of revolutions or blinks - the type of reading depends on the type of device.

How to understand that it is time to replace the meter.

Based on the rotation of the disk or electronic indicator, the consumed resource is calculated. In other words, these figures act as indications for calculating electricity - 1 kilowatt is equal to the approved tariff in the region.

Step #4: Establishing the error

Another necessary stage of conducting an inter-interval check of the electric meter is error diagnosis. The event is conditioned by establishing the correctness of the transmitted readings.

Step #5. Detection of meter magnetization

A pressing question for consumers is how often the electric meter is checked for magnetization. The topic is of interest to those property owners who have an old-style disk device installed. The new generation of IPUs are created on the basis of induction and have a protective seal that changes color when interacting with a magnet. Verifications of this type are required by the RSO to be carried out no more than once every six months.

An analysis of the magnetization of an individual consumption device can be carried out using a regular needle - if it is attracted to the equipment, then, therefore, the IPU has a strong magnetic field. It is noteworthy that such circumstances work both to the consumer’s advantage and to the disadvantage. That is, prohibited devices will not slow down, but, on the contrary, will accelerate the rotation of the disk, which means the owner will pay more.

Verification period

The timing of verification of electricity meters depends on the specifics of the procedure, i.e. whether the IPU needs to be removed or not. In the first case, a thorough diagnosis and issuance of a result on the possibility of operation will be required. This procedure can take several hours or 2-3 days.

If the inter-verification analysis does not require dismantling the electric meter, then the defining parameters are:

• diagnostics of the nominal voltage in the network - takes about 15-20 minutes;
• checking the fact of “self-propelled” – this will take 10-20 minutes;
• 10 min. an inspection is performed to ensure that there are no physical defects on the IPU;
• additional time is spent completing the report on a special form and sealing the meter.

We are starting to replace the electric meter

Before you begin dismantling and installation, you need to find out three important things.

1. Is it possible to safely remove the seal from an old electric meter? That is, the owner made an agreement in the electrical networks, received permission, and assumes all documentary responsibility.
2. Where will we get power for the rotary hammer/drill if we have to drill a wall?
3. Workplace lighting. For this purpose, I use an LED “miner’s” headlamp.

We’ve prepared, we’ve figured out everything, we move on. We turn off the input circuit breaker (switch) before the meter, thereby de-energizing the meter and ensuring comfortable and safe operation. We remove the seal, unscrew the cover under which the input and output terminals are located.

Old electricity meter SO-5 - open terminals, removed plugs

Here it wouldn’t hurt to turn on the input machine and, just in case, check the correctness of the connection diagram using an indicator screwdriver (phase indicator). You never know what happened before, what miracles happened here in the past :), and you have to be completely confident in your work.

Let me remind you that the four power contacts of an electric meter are always arranged in this order:

1. Input phase, comes from outside
2. The output phase goes to power our consumer
3. Input zero
4. Output zero

The connection diagram for an electric meter is usually indicated on its cover, so anyone with a basic understanding of electrics can connect it with their own hands.

And since you are reading this article, it means you understand! And remember, the main thing is safety!

It is very important that the 1st and 2nd contacts are not mixed up, otherwise claims from inspection authorities will be inevitable, and the owner may be suspected of evil intentions. The 3rd and 4th neutral contacts are usually short-circuited in the meter itself, but they also need to be mounted correctly for order.

What documents are issued after verification - types of marks in the act

Calibration interval of the Mercury meter.

If the verification interval of the electric meter expires, then it is necessary to submit an application to the state metrological center or a private company. In the document about the certified device, the employee of the institution is obliged to put notes not only about the fact of diagnostics, but also to reflect the dismantling and installation of the IPU.

According to regulatory provisions, legal removal of the device is carried out by RSO employees.

An employee of the institution is authorized to carry out the following activities:

1. Comparative analysis of current electric meter readings.
2. Preparation of documents for dismantling IPU.
3. Initiate the transfer of settlement transactions from the amount of consumed resources according to average standards.

Removal and installation of equipment is also carried out by employees of an energy-saving institution. After installation of the resource metering device, sealing is carried out. Such operations are permitted by accredited persons. Violation of the control label is subject to administrative penalties.

After replacing the IPU, if necessary, an act is generated. The document is endorsed by two parties - the owner of the premises and the contractor.

The paper must be drawn up reflecting the following information:

• address of the property where the work was carried out;
• technical parameters of the removed and installed device;
• date of procedure;
• the day of verification of old and new equipment;
• indications;
• the number of unaccounted resources at the time of the absence of the IPU;
• reasons for replacement;
• data of the company that carried out the maintenance of the electric meter, including details.

In case of installation of a new individual metering device, it is necessary to draw up an act in two copies. One copy remains with the apartment owner, the second is transferred to the RSO. If only verification was carried out, then the date is stamped on the seal and is additionally displayed in the technical passport. The next verification interval will be counted from this day.

According to current laws, an employee of the organization must also reflect in the documents the identified shortcomings and errors in the transmitted readings. Correct operation of the equipment depends on the type of device being used and ranges from 6 to 16 years.

How to connect

The electric meter has four terminals for connecting wires. The diagram shows color coding for different terminals. When the device is located on the front side, all terminals are designated by numbers from one to four.

The first terminal is connected to the phase wire. This wire carries electricity from the panel or input. The second terminal is responsible for introducing a phase into the power supply network of your home.

Behind the meter there is a circuit breaker (sometimes fuses or distribution panels) that divide the internal circuits into groups.

The third terminal is needed for the neutral wire and input. The fourth terminal passes the neutral input wire into the house.

These are the main parameters of the SO‑505 electric meter. Although this meter is quite large, and does not have the highest accuracy compared to some of its analogues, the CO 505 electric meter is still a high-quality and reliable device for calculating electricity consumption.

Who pays and the cost of checking the electricity meter

The owner of the property independently bears the burden of expenses for servicing the electric meter.

This applies to the following activities:

• dismantling;
• transportation;
• diagnostics;
• installation;
• installation of a seal.

The cost of checking the electric meter will depend on its type and model.

The table shows the estimated cost of the service:

Table 3.

It is noteworthy that private companies offer additional services so that the consumer does not overstay the verification interval.

For example:

• diagnostics within 5 days leads to an average price increase of 20%;
• if similar work needs to be completed in 3 working days, then by 50%;
• high urgency of the event leads to the establishment of a premium of 100%.

Free verification

Free verification is available to citizens who have entered into a social tenancy agreement or to users of municipal housing.

Varieties of this counter

This product was produced in two varieties.

SO-2

A model with an electric current of 5 and 10 amperes, a standard two-phase voltage for household electrical networks of 220V with two options for the number of disk revolutions per kilowatt-hour of measured consumption.

SO-2M

The modification was made with similar characteristics. The only difference is the presence of additional protection that prevents the theft of electricity.

What to do if the MPI has expired

How to understand that the meter needs to be replaced.

If your electricity meter has expired, you need to contact your utility service provider. A written notification is drawn up about the need to diagnose IPU. During device research, fees for resource consumption will be charged based on average indicators.

If the IPU is not verified and installation is not carried out within 3 months, then receipts will be issued in accordance with the standards relevant in the consumer’s region of residence. Each subject of the Russian Federation has separate regulations for such cases. Experts recommend purchasing a new sealed electric meter, since in most situations, after diagnostics, the non-working state of the old IPU becomes clear.

Removing the old meter

Carefully unscrew the terminals and the meter itself. In this case, you need to be especially careful with the wires coming to the meter if you do not plan to change them. We still have to screw these wires to the new meter.

We see a getinax plate screwed to the wall:

Dismantling the old electricity meter SO-5. The holes are drilled - are they really for ventilation?

Unscrew the plate, carefully pulling out the wires. Before doing this, it is better to mark the wires with a marker, so that later you don’t have to think too much about what comes from where and where. I usually mark the phase in black.

Wires to the electric meter

The wires are a bit short, and we don’t need additional contacts. Therefore, you will need to try to install the meter a few centimeters higher. Under no circumstances do we throw away the old meter (and the seal!); the owner of the apartment will need it when re-issuing documents.