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Insulation resistance measurement service in Moscow

Electrolaboratory EnergoServiceGarant» provides insulation resistance measurement services. You can order a measurement of the resistance of the sheath of cables and wires from us. favorable prices, which we will hold at any residential, industrial and commercial facilities in Moscow.

Cores in electric cable separated from each other by a special insulating sheath, the resistance of which, ideally, should be infinite. But in practice, there is a leakage current between live conductors, therefore, with the deterioration of the insulating properties of the cable sheath, fires and short circuits can occur. , carried out in a timely and regular manner, allows you to avoid the occurrence of unpleasant situations.

Insulation resistance measurement frequency

The frequency of measuring the resistance of the cable sheath, according to clause 62.2.1 of GOST 50571.16-2007, is a time interval that is determined by the consumer of the electrical installation. But in Appendix 3.1 of the PTEEP, this time interval is specified: it says here that it is necessary to measure the resistance of electrical wiring in outdoor installations and especially dangerous premises annually. At other sites - once every three years.

Carrying out measurements of insulation resistance - features

Measurement of the resistance of the cable sheath is carried out with a special device - a megaohmmeter. This device generates a given voltage and measures the resistance level.

The method for measuring resistance is quite simple. It consists of three stages:

Megohmmeter generates measuring voltage.

The device determines the leakage current that passes between the conductors.

The resistance of the insulating sheath is calculated, which is a quotient of the listed values.

It should be noted that the number of measurements may differ depending on the number of cores in the cable. For example, if the cable consists of:

out of phase and neutral wire, only one measurement is carried out;

from the phase, neutral and ground wires, three measurements are taken;

from three phases and a neutral wire - six measurements;

three phases, neutral and ground wires - ten measurements.

It is mandatory to carry out only when all equipment is disconnected from the network. If the electrical installation is connected to voltage, when it is applied, the semiconductor circuits of electrical appliances may fail. The electrical personnel of the customer must turn off the devices before conducting electrical tests. Measurement of the cable sheath resistance under voltage is not carried out!

The results of the work on measuring the insulation resistance

The resistances allow timely assessment of the condition of the insulating sheath and, if necessary, taking measures to partially replace the wiring, which, in turn, exclude equipment breakdowns and the possibility of fire in the room. Also, verification is required for oversight bodies. For example, Rostekhnadzor, in the absence of a technical report and protocols with measurement results, imposes liability on the enterprise in accordance with Article 9.11 of the Code of Administrative Offenses of the Russian Federation. In addition, the protocols of measurement results may be required by inspectors of the State Housing Inspectorate.

You should be aware that the protocols that are drawn up by an electrical measuring laboratory with its own certificate of registration with Rostekhnadzor are considered legally significant, that is, such as EnergoServiceGarant».

After the specialists of the electrical laboratory carry out resistance measurements and complete all the results in the necessary way, the employee EnergoServiceGarant» will present to the customer . It will include not only protocols with the results of testing the resistance of the insulating sheath of cables and wires, but also a defective statement with comments and recommendations for correcting defects, as well as a copy of the laboratory registration certificate.

If you still have questions about the work of the laboratory EnergoServiceGarant", write to us in a special form feedback on the website or call, or contact us via Email. It is desirable that you voice your requirements immediately when contacting our company - this will allow us to evaluate the approximate scope of work and provide you with an estimate for their implementation.

Electrical cable and wire are an integral part of absolutely any power supply system and, like any electrical equipment, they require constant attention. Electrical wiring and cable lines must be subjected to insulation resistance measurement immediately after and during operation. During manufacture, during transportation to warehouses and facilities, the cable is constantly subjected to mechanical stress.

Drums and coils with cable and wire are rolled, dragged along the ground, thrown from place to place. In addition, they lie in the open air and scorch under the hot sun or freeze at 40 degrees below zero. Naturally, under the influence of precipitation, high and low temperatures insulation begins to age prematurely. Unfortunately, most electricians ignore these facts and carry out cable wiring without prior verification. In addition, installers very often violate the installation technology and lay the cable with gross violations. Therefore, only measuring the insulation resistance can guarantee the quality of the insulation of conductors walled up in walls, floors and ceilings.

During operation, cable lines and electrical wiring also have a hard time. Very often, when installing powerful modern equipment and technology that consumes a large number of electricity, I do not take into account the fact that this electrical installation is simply not designed for such power. As a result, the conductors overheat during operation, their insulation wears out and ages quickly, and circuit breakers constantly disconnect the load. Some enterprising people solve the last problem by installing a protection device with an overestimated rating, thereby rendering the conductor insulation unusable.

Since unprotected wires with worn insulation can at one point cause a fire. Periodic measurement of insulation resistance allows you to identify all these problems and eliminate them in a timely manner. Otherwise, they will, at a minimum, lead to a leakage of electricity, and, at a maximum, to a fire.

Measurement of insulation resistance begins with a visual inspection. When examining cable lines and electrical wiring, electrical laboratory specialists first of all check their outer insulation for visible damage and defects. Please note that in the places of cable bends, passages through walls, places of inputs into switchboards, it must be protected from mechanical damage. Special attention during visual inspection, be given to the melted ends of the insulation, since this indicates that the cable (wire) was very hot during operation. The reason for this may be a poor connection of the wires to the terminals, a malfunction or an overrated circuit breaker.

After a visual inspection, they begin to measure the insulation resistance. Tests should be carried out on a disconnected electrical installation, that is, all conductors to be tested must be in without fail de-energized, and the electrical equipment is disconnected from the network. When measuring the insulation resistance of lighting circuits, all lamps must be unscrewed from lighting fixtures and the switches are on. The measurement of insulation resistance is carried out by a device specially created for this purpose - a megohmmeter.

At the same time, it is impossible to use devices for measuring insulation resistance that have not passed annual verification. As a rule, insulation resistance is measured between phase conductors, phase and zero working conductor, phase and zero protective conductor, as well as between zero working and protective conductors. That is, the number of measurements depends on the number of wires in the line. At the same time, the least permissible value insulation resistance must be at least 0.5 MΩ.

If the measured reading is less than this value, then the cable line can be divided into sections, starting from the switchboard, and the insulation resistance of each resulting section can be measured. Cable (wire) with faulty insulation is subject to immediate repair or dismantling and replacement.

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  Stanislav We built a lighting line of 23 poles. The cable between the supports is laid in the ground. Each support has a cable cut. To put the line into operation, we are forced to measure the insulation resistance ...

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PSM-service and Company LLC carries out electrical measuring work in its own laboratory. The company has a permit to perform preventive tests, inspection of electrical equipment and installations with a voltage of less than 1000 V.

Every year, laboratory specialists confirm their qualifications and knowledge by passing exams at Rostekhnadzor.

Why is this needed?

Measurement of insulation resistance is necessary to control the compliance of this parameter with established electrical standards. This is a preventive measure aimed at preventing short circuits, which, in turn, can lead to damage to expensive equipment, serious or fatal electrical injuries, fires, and other serious consequences.

The technical report, which contains information on the conduct of control measures, is presented to the inspectors of the Ministry of Emergency Situations who verify compliance with the fire protection rules at this facility.

Performance of electrical work

The main task when taking measurements of insulation resistance is to check the compliance of the operating parameters of the electrical network with the established and design values. If inconsistencies are found, the data is entered into the defective statement. After the measurements, violations are documented that can cause a fire, equipment failure, or lead to electric shock.

The survey is carried out at electrical installations of administrative facilities, shopping and entertainment centers, office buildings, residential buildings, industrial and construction sites.

Competent laboratory personnel are specially trained to test insulation resistance in accordance with PTEEP and PUE standards. Engineers perform electrical work before putting objects into operation, after any type of repair, during installation and commissioning of electrical equipment. Measurements are entered in the technical report, all data are objective and relevant at the time of the survey, they meet the requirements of Rostekhnadzor.

Algorithm for conducting electrical work

Only specialized laboratories with the appropriate permit are entitled to engage in this activity.

Measurement of ground resistance is carried out using a special device - megohmmeter. The algorithm is described in GOST 3345-76, it provides for connecting the terminals to the cable cores with a high voltage supply. In this case, the external load must be switched off. It should be borne in mind that the results of control and test measures are affected by humidity and temperature.

At the end, a protocol (act) is drawn up, which is to be stored in the electrical laboratory for 5 years.

Insulation resistance test frequency

The deadlines for the implementation of control measures are defined in the PTEEP (Appendix 3.1) and are determined by the specifics of facilities and equipment. In a standard situation, this is done every three years. At especially hazardous facilities, insulation resistance is measured every 12 months. The same frequency is determined for lift and crane equipment. On welding machines and portable electrical receivers, control should be carried out every six months.

Failure to comply with the deadlines is punishable - from penalties to the suspension of the activities of a business entity.

Types of electrical work

In the laboratory of the company "PSM-service and Company" are carried out:

• Inspection of the state of grounding elements of electrical equipment.
• Checking insulation resistance, transient values ​​of all components of the circuit.
• Recording the current values ​​of a single-phase short circuit of the "phase-zero" loop in equipment with a voltage of less than 1000 V with a solidly grounded neutral.
• Grounding measurements in devices of any type.
• Study of protection operation in power supply systems with isolated and grounded neutral.
• Measurement of insulation resistance of windings of electric motors, cables, wiring circuits, secondary circuits with voltage less than 1000 V.
• Diagnosis of emergency lighting circuits.
• Equipment inspection protective shutdown.
• Check for operation by current in electrical networks with a voltage of not more than 1000 V.
• Drafting electrical circuits single line type.
• Measurements of insulation resistance of cable lines, electrical equipment.
• Inspection of protective shutdown devices.
• Electrical measuring work on testing electrical installations of public and residential facilities.

The cost of the work is easy to calculate on your own. Estimated prices for square meter are in the range of 70-140 rubles. Conducting measurements of insulation resistance is carried out quickly and efficiently. final cost electrical work will depend on the purpose and type of object.

Call and consult on all issues with a competent employee of the company.

The cost of electrical work

Job Title	Price in accordance with the estimated standards TSN-2001	Price LLC "PSM-service and Company"
Insulation resistance measurement for a line of 3 cores	150	70
Insulation resistance measurements per line of 5 cores	180	90
Phase-zero loop measurement	450	140
Loading a single-pole machine	380	90
up to 50A	530	130
Loading three-pole machine up to 200A	800	170
Examination single-pole RCD	380	110
Examination three-pole RCD	650	200
Checking for a ground circuit	60	25
Ground loop resistance measurement	1500	450
Measuring the insulation resistance of machines	40

Insulation resistance measurement - absolutely required action, which ensures the safety of the operation of the electrical network in any buildings and types of premises. It must be carried out regularly, in accordance with the requirements of GOST.

With today's variety of electrical appliances and electrical engineering, the load on the power grid increases many times over. At the same time, the threat of emergencies in connection with the failure of one of the circuit elements also increases. This can lead to fires and property damage.

Measurement of insulation resistance is carried out, as a rule, in the lighting network. To do this, specialists take indicators on trunk lines and common switchboards, and then on the billboards in each apartment. Also, the measurement of insulation resistance affects switches, sockets and lighting fixtures.

Many homeowners or commercial premises do not even think about the need for such a procedure. Most of them just don't know about it. Meanwhile, such neglect can turn into sad consequences. Let's explain why.

Electrical wiring, as well as many other things, wears out over time, loses its safety and reliability qualities. Wires are subjected to heavy loads every minute, so their insulation wears out. In some cases it happens quickly, in others it takes longer. No one, even a highly qualified specialist, can predict the exact time when a failure may occur.

Another important point when measuring the insulation resistance is simply necessary. This is the case when you did the wiring. It doesn't matter if you made it new apartment or replaced the wiring in the old one. In any case, you simply have to contact specialists to measure the insulation resistance, because before the complete commissioning of the entire electrical network, you need to make sure that no damage to the circuit and wires was allowed during the installation work.

In addition, a report on insulation resistance measurements is necessary for all landlords, since it is precisely this report that employees of the Ministry of Emergency Situations pay close attention to during inspections. Also, when commissioning facilities, a technical report with data on the state of insulation resistance is one of the points of permits.

To spend everything necessary procedures for measuring insulation resistance, use the so-called electrical laboratory. In fact, this is a set of tools, tools and methods used in the conduct of relevant work.

The specialists of the electrical laboratory measure the resistance both for preventive purposes and for the purpose of diagnosing the electrical network in case the customer makes any complaint about the malfunctioning of one or another element of the electrical circuit. Employees find out the causes of failures in its work, give recommendations for their elimination and further correct operation and also fix these problems.

By the way, in addition to measuring insulation resistance, it is extremely useful to periodically test the electrical network itself in order to identify weaknesses and thereby prevent serious problems in the future. For this, as a rule, measures are taken to test the RCD and ATS, grounding devices, protective equipment and ground loop.

As for measuring the insulation resistance, it must be carried out regularly. In accordance with the requirements of regulatory and technical documentation (PTEEP), insulation resistance measurements are carried out at the following intervals:

As a result of the work done, you receive a technical report in accordance with GOST R 50571, containing information on the state of the electrical installation, presented to inspectors of the state fire supervision and the federal department for environmental, technological and nuclear supervision (ROSTEKHNADZOR).

In order to measure the insulation resistance, you need to contact specialists who, in addition to licenses and permits for such work, also have great experience. In our company, all work is carried out by highly qualified specialists.

We carry out the following works:

• loading machines;
• drawing up single-line diagrams;
• insulation resistance measurement;
• ground resistance measurement;
• measurement of transient resistance;
• dimension resistivity soil;
• measurement of parameters of a short circuit loop;
• measurement of parameters of residual current devices, etc.

Experience and professional level of our employees allows us to cope with the most serious tasks. We carry out electrical measurements and equipment testing up to and above 1000 V.

We have our own electrical laboratory: certificate of registration of the electrical laboratory dated December 05, 2013 No. 553/130-13.

We offer insulation resistance measurements up to 30% more profitable than other similar companies. Departure for drawing up estimates and determining the work is free of charge.

The cost of measuring insulation resistance

The cost of measuring insulation resistance in our company starts from 3,500 rubles (including all expenses).

Scheduled inspection and repair of electrical equipment is not always effective. To identify damage and malfunctions at an early stage, to prevent emergency situations allows thermal imaging inspection of electrical equipment.

Our company conducts thermal imaging inspection of electrical equipment when performing insulation resistance measurements.

When contacting us, thermal imaging of the switchboard as a gift!

Manufacturing enterprise - Alfa-Siltek LLC

An object: External networks, KTP No. 2076-6 / 0.4 kV, warehouse finished products, Shop №2 , Shop №1

Completed works: Operational

1. Visual inspection of electrical installations to verify compliance with requirements
2. Checking the presence of a circuit between grounded installations and elements of a grounded installation.
3. Checking the insulation resistance of wires, cables and windings of electrical machines.

The quality of insulation determines the degree of safety in the operation of electrical networks and electrical equipment. An important indicator that determines its integrity and degree of wear is the insulation resistance. Therefore, any check of the state of insulation is associated with the measurement of this characteristic. The frequency of such checks is determined regulations Rostekhnadzor, Ministry of Emergency Situations and other regulatory authorities. There is the following frequency of measurements: at hazardous production facilities and in outdoor electrical installations, insulation resistance measurements are carried out at least once a year, in administrative and residential buildings once every three years.

Order measurement

Measurement of insulation resistance with a megohmmeter

The cable cores are separated from each other by a special insulating sheath. At the best option its resistance reaches infinity. But in practice, the opposite is true. When a voltage is applied between such conductors, an electric current is formed, which is called "leakage current". In the event that the insulating coating of the wires is broken, this can provoke short circuit and - as a consequence - lead to a fire. But if you carry out timely control, measure the insulation resistance of the electrical wiring, then this will avoid serious consequences.

It is worth remembering that the service life of the wire sheath is not infinite. Cable manufacturers guarantee their reliable operation up to 10 years. But in reality, insulation deteriorates much earlier. Many factors affect electrical wiring:

• sunlight;
• increased voltage;
• temperature;
• aggressive environment;
• humidity;
• various microdamages.

In cases where insulating materials have a high resistance, the insulation resistance is measured with a megohmmeter - a device specially designed for measuring large values this characteristic. It is used in testing the windings of electric motors, electrical equipment, wires, cable line, electrical circuits, transformers, etc.

Megger has its own generator direct current and measuring mechanism, as well as additional resistors. It is capable of generating voltages from 100 to 2500 V. The data obtained as a result of the measurement allow calculating the moisture and aging coefficients of the insulation.

Engineer's advice

What is it for?

Conducting insulation resistance measurements will allow you to detect deviations in the characteristics of the wiring in advance. They can lead to hitting a person electric shock. The wires themselves can ignite. And this is very dangerous. Well, if in such situations it is possible to avoid the death of a person. But the material damage from this will still be great.

Timely measurements of electrical wiring insulation can avoid such situations. If this indicator is normal, then this is good, but if not, it is urgent to apply appropriate measures to replace the wiring.

The condition of the insulation also affects the fire safety of the entire powered facility. The presence of a protocol for measuring insulation resistance, the price of which cannot be compared with material damage, is also required by the regulatory authorities of the State Fire Supervision (MES). But it is worth remembering that legal force possess only those protocols that were compiled by a special electrical laboratory. Such measurements cannot be carried out by ourselves.

When is the best time to check?

When it comes to wiring in a new or renovated building, the insulation resistance test of the wiring should be carried out at least twice. The first test is carried out before finishing works, that is, before the rough plastering of the walls. This is done in order to initial stage identify all weaknesses. The second test should be carried out after the mortar has dried. This is done repeatedly in order to exclude the moment of damage to the insulation during finishing work and to correct possible damage before the start of fine finishing.

What elements of the electrical network are tested?

• power wires and cables;
• windings of electric motors and transformers;
• secondary circuits;
• alarm and measurement circuits;
• control circuits;
• low-current system;
• building lighting networks;
• fire alarm circuits;
• combined and connecting tires;
• electrical equipment of electrical installations.

Meter of parameters of electrical safety of electrical installations

Currently, to assess the state of electrical engineering and power networks, a multifunctional device is more often used - a meter for the electrical safety parameters of electrical installations, which provides high quality and accuracy of measurements.

The electrical laboratory of PROFENERGIA Engineering Center LLC is equipped with a Metrel MI 3102H CL multifunctional electrical installation parameter meter, certified by the regulatory authority and having a corresponding mark in the passport. His specifications and parameters match current regulations PES and PEET. Therefore, the determination of the insulation resistance of electrical wiring is characterized by a low price. The cost of measuring insulation resistance in Moscow and the Moscow region is 120 rubles for one two-core cable or wire, 170 rubles for a 3-core cable, 220 rubles for a 4-core line and 280 rubles for a 5-wire line. The price of preventive measurements is 50% of the indicated cost.

On average, insulation resistance measurements take no more than one working day. After completion of the check, the customer is given a protocol of the established form.

It should be noted that often in pursuit of a low price, customers do not fully appreciate the risks associated with measurement errors. Note that the price of measuring the resistance of the insulating layer in our company is quite democratic.

The high quality of services, the reliability of measurement data is a guarantee of safety and insurance against emergencies, which fully justifies the cost of the services of the PROFENERGIA electrolaboratory. With us, checking the resistance of the protective layer of the line is a guarantee of quality and reliability.