China 'GB/T 21421.1-2021
' standard english version:
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 21421.1-2021
Composite string insulator units for overhead lines with a nominal voltage greater than 1 000 V—Part 1:Standard strength classes and end fittings 标称电压高于1 000V的架空线路用复合绝缘子串元件 第1部分:标准强度等级和端部装配件
Issued Date:2021/12/31
Implemented Date:2022/7/1
Issued by:
The Standardization Administration of the People's Republic of China