Home / Standards / GB/T 21697 GB/T 21697 Active Insulation coordination of lightning overvoltage for low-voltage distribution wiring and electronic systems 低压配电线路和电子系统中雷电过电压的绝缘配合 Standard Type GBT ICS 91.120.40 CCS K04 Status 现行 Issue Date 2022-07-11 Implementation 2023-02-01 Responsible Dept 国家标准委 Drafting Unit 国家标准委