ANSI C12.20 is an ANSI standard that describes an American National Standard for Electricity Meters - accuracy and performance. The C12.20 standard established the physical aspects and performance criteria for a meter's accuracy class. It refines certain details in ANSI C12.1 and ANSI C12.10. The existing ANSI accuracy classes for electric meters are: * Class .5 - having ± 0.5% accuracy. * Class .2 - having ± 0.2% accuracy. * Class .1 - having ± 0.1% accuracy. Outside North America, IEC standards are used for electric meters.
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