Generally, a meter with loads of 20 kVA up to 100 kVA invites annual testing while those above 100 kVA every three, six or twelve months based on load category and domestic meters every five years. In order to ensure that the bills are accurate, it is advisable to check the meters every month. However, since there is no interference of any kind and that it is as per consumption, a check once in a way should be fine. This is because evaluation of normal monthly consumption patterns and payment are ideal indicators as it is a routine exercise. However, one would surely understand the deviations from this routine billing and can lodge a complaint.
A simple test on turning one facility and checking the meter speed to compare with multiple facilities would indicate meter performance.
Smart meters could be designed for half an hour, once a day or even once a month depending upon the utility and requirement. Meter calibration is also important and as a rule, it is 10 years for newly approved induction meters and up to 20 years for static meters.
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