根据国家标准GB/T15283-94和国际标准IEC521-1988,电能表标有两个电流值,分别是标定电流和额定最大电流。如10(20)A,这里所标10 A为基本电流,是确定仪表有关特性的电流值,也称为标定电流值,反映电表精确程度的参数;20 A为额定最大电流,是电表能满足其制造标准规定的准确度的最大电流值,一般为标定电流Ib的4倍及以上,并在1.2Imax运行1 h,电能表不应损坏,但超过这个电流值,可能会造成电表计量不准确。 According to the national standard GB / T15283-94 and international standard IEC521-1988, the energy meter has two current values ​​marked as the rated current and the rated maximum current respectively. Such as 10 (20) A, here labeled 10 A is the basic current, is to determine the instrument related to the characteristics of the current value, also known as the calibration current value, reflecting the accuracy of the meter parameters; 20 A is the rated maximum current is the meter can meet Its manufacturing standards provide the maximum accuracy of the current value, which is generally 4 times the rated current Ib and above, and run at 1.2Imax 1h, the meter should not be damaged, but beyond this current value may result in inaccurate meter .