China 'GB/T 17215.221-2021
' standard english version:
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 17215.221-2021
Electricity metering equipment(a. c. ) -- General requirements, tests and test conditions -- Part 21: Tariff and load control equipment 电测量设备（交流） 通用要求、试验和试验条件 第21部分：费率和负荷控制设备
Issued Date:2021/3/9
Implemented Date:2021/10/1
Issued by:
The Standardization Administration of the People's Republic of China
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