Attributes . Active energy +/- 0.5 %;reactive energy +/- 2 %;active power +/- 0.5 %;apparent power +/- 0.5 %;frequency +/- 0.05 %;power factor +/- 0.5;current +/- 0.5 %;voltage +/- 0.5 %;apparent energy +/- 0.5 %;reactive power +/- 2 %;Class 0.5S active energy IEC 62053-22 . Names