Attributes . Apparent power +/- 0.5 %;frequency +/- 0.05 %;active energy +/- 0.2 %;reactive energy +/- 1 %;active power +/- 0.2 %;voltage +/- 0.1 %;power factor +/- 0.005;current +/- 0.15 %;reactive power +/- 1 %;Class 0.2S active energy IEC 62053-22 . Names