ANSI C12.20
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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.