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§ 9 Verification of meters

This information is more for general development. Each meter has a so-called inter-calibration interval (MPI), through which theoretically the energy inspector should come to you and check the correctness of its inclusion and the accuracy of measurement. I won’t lie, I won’t say for sure, but it seems to be 5 years for induction meters, -10 for electronic meters. At your place where in the farthest box there should be a passport of the counter in which the date of the next verification should be indicated. Do not look at the inter-verification interval indicated in the passport - some especially smart manufacturers to overestimate their good counters, overestimate this interval. This interval is definitely not determined by the manufacturers. And it is precisely in your interests that by this date everything is in the best possible way - seals, proper connection, and all kinds of left wires would not enter the apartment. If there is no seal, drive it to the ZhEKovsky electrician he definitely has. Like there was an emergency, he tore off the seals and put his own - this is not forbidden. Of course, after the breakdown, supervision should be notified, but there is such a mess that no one will understand who called or not. You cannot get them on an emergency call either.
If they do not come after the end of the verification period, it’s not a sin to go by yourself. The explanation may be something like this: "The term of verification verification has expired and now your counter does not know what it considers - it can be electricity, or maybe the wind speed in Antarctica. Therefore, until verification is carried out - I will not pay for electricity." It’s kind of like with a car: no inspection - you can’t drive. And any court will be on your side. An unverified counter is considered defective.

Checking the meters at the installation site is always done without measuring transformers to which the meter is connected. For this, exemplary devices are included in the secondary circuits of current transformers and voltage transformers. Verification can be done either by the method of a wattmeter and a stopwatch, or by comparison with a model counter.
The use of an exemplary meter is always preferable, since in this case, load fluctuations do not affect the results of verification. However, the method of a wattmeter and a stopwatch is almost always used as a more affordable method (portable reference meters are not yet produced in our country). Before verification, reference devices should be selected accordingly to the accuracy class of the verified counter. According to the basic requirement of GOST 14767-69, exemplary devices must provide electricity measurement with an error not exceeding 1/4 of the permissible error of the meter being verified. So, for class 2.0 meters, the error in determining electricity should be no more than 0.5%. It should be remembered that this error is the resulting error of all exemplary devices that measure energy, that is, one or two wattmeters and a stopwatch.

In life, it all looks like this: an exemplary wattmeter is connected, or an ammeter with a voltmeter, an exemplary load is connected and the current power is measured for a certain period. That is, simply put, the number of revolutions of a disk (or pulses for an electronic one) is considered at a certain standard current and voltage applied to the counter for some time. The quantity coincided - it was suitable, did not coincide - to the laboratory ...

PS Finally, I’ll tell you one funny story (real) from life. My friend had a summer house and there was a power line next to her. But officially, he was not connected to her. Either it was lazy to run about the connection to him, or the limits on installed capacities were over and therefore they did not allow to connect. In short, this moment is dark and lost in historical obscurity.
Well, without hesitation, he dug a trench to the nearest pillar, laid a cable in it, lifted it along the pillar and connected. Well, the catcher and the beast runs. There is a check here and they catch him as they say red-handed. The cable is cut under the root of the pillar and taken away. And after a while a claim comes to him - pay dear comrade electricity for six months at the rate of 1.5 kW hourly and around the clock.
I don’t remember exactly how much, but the amount was decent. Well, my intruder says: "Well, I’ll pay for the energy if you subtract the cost of my cut cable." The power engineers immediately burned with righteous anger and said: “But have you not become impudent guy?”
The matter went to trial. Power engineers flatly refused to acknowledge the fact of cutting the cable, and indeed its presence on the pole. And the acquaintance says: “Well, since there was never a cable, how could I steal electricity at all?”
The court won, didn’t pay any fines, used electricity for free for six months. Loss: 5 m cable. True, then with the official connection he had big, very big problems, but this is a completely different story ...