Home / Standards / GB/T 39437-2020 GB/T 39437-2020 Active Technical specification for lightning protection of water supply and drainage system 供排水系统防雷技术规范 Standard Type GBT ICS 07.060 CCS A47 Status 现行 Issue Date 2020-11-19 Implementation 2021-06-01 Responsible Dept 中国气象局 Drafting Unit N/A