Home / Standards / GB/T 21707-2008 GB/T 21707-2008 Abolished Insulation specification for variable frequency adjustable speed definite purpose converter-fed three-phase induction motors 变频调速专用三相异步电动机绝缘规范 Standard Type GBT ICS 29.160.30 CCS K22 Status 废止 Issue Date 2008-04-24 Implementation 2008-12-01 Responsible Dept 中国电器工业协会 Drafting Unit N/A