Electricity metering equipment (a.c.) - Acceptance inspection Part 21: Particular requirements for electromechanical meters for active energy (classes 0,5, 1 and 2 and class indexes A and B) (IEC 62058-21:2008, modified); German version EN 62058-21:2010
电能计量设备(交流).验收检验.第21部分:有功电能机电式仪表的特殊要求(0,5,1和2级以及a和B级指标)(IEC 62058-21:2008 修改);德文版EN 62058-21:2010