AC Static Transformer operated Watt-hour and VAR-hour meters, class 0.2S and 0.5S - IS 14697
This standard specifies static watthour meters with accuracy classes 0.2 S, 0.5 S, and 1 S, as well as var-hour meters with accuracy classes of 0.2 S, 0.5 S, and 1 S, for measuring alternating current electrical active and reactive energy at frequencies ranging from 45 Hz to 55 Hz for single-phase and three-phase balanced and unbalanced loads.
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