ANSI C12.1-2008
4.7.3.7 Test No. 21: Effect of current surge in ground conductor
地面导体电流浪涌影响
Three metering devices shall be subjected to one transient surge of 20 000 A (20/50 microsecond wave) of either polarity through a conductor placed vertically 1.5 inches (38.1 mm) behind the flat portion of the base of the metering device, with a socket in place. This test shall not apply for metering devices with terminal compartments (Type A) or for Class 10 or Class 20 metering devices. The effect of current surge upon the
performance of a metering device shall not exceed the maximum deviation specified in Table 25.
小弟翻译为:
通过将导线垂直后置于电表的底座的平面部分1.5 inches (38.1 mm)处,插座就位,电表(3个)应承受任一极性20 000 A (20/50 微秒波)的瞬时浪涌。此试验不适用于带(A型)端子间隔的电表或10级或20级的电表。电表收电流浪涌影响产生的变化不能超过Table 25中规定的最大偏差。