Yes, does seem like slightly approaches based upon region and country, I just had a quick look (may not be 100% accurate) but thought the below was interesting.
Electric Meter Calibration Practices by Country
Austria
- Calibration Period:
4 to 20 years, with a 5-year extensionrecalibrated every 5 years (domestic)possible through statistical examination. - Structured system ensures consistent accuracy across different meter types.
Germany
- Governed by the Measurement and Verification Act (MessEG) and Measurement and Verification Ordinance (MessEV).
- New meters comply with the European Measuring Instruments Directive (MID).
- Calibration intervals can be extended by 5 years through a random sample procedure.
United Kingdom
- Meters are factory-calibrated and generally not recalibrated unless their accuracy is in question.
- Relies on specific codes of practice, such as for accuracy in settlement purposes.
- A less structured approach compared to Austria and Germany.
United States
- No nationwide standard; calibration frequency varies by state, utility company, and meter type.
- Common intervals range from 5 to 10 years, based on manufacturer recommendations or local regulations.
- A decentralized, flexible system.
This comparison highlights the diverse approaches to electric meter calibration across countries. Austria and Germany have more structured systems, while the UK and US offer greater flexibility.
In a completely sane world, madness is the only freedom (J.G.Ballard).
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