Home / Standards / GB/T 21707-2025 GB/T 21707-2025 Active Insulation specification for frequency conversion machine 变频调速电机绝缘规范 Standard Type GBT ICS 29.160.01 CCS K20 Status 现行 Issue Date 2025-05-30 Implementation 2025-12-01 Responsible Dept 中国电器工业协会 Drafting Unit N/A