Home / Standards / GB/T 4772.1-2025 GB/T 4772.1-2025 Active Dimensions and output series for rotating electrical machines—Part 1: Frame numbers 56 to 400 and flange numbers 55 to 1080 旋转电机尺寸和输出功率等级 第1部分:机座号56~400和凸缘号55~1080 Standard Type GBT ICS 29.160.01 CCS K20 Status 现行 Issue Date 2025-08-01 Implementation 2026-02-01 Responsible Dept 中国电器工业协会 Drafting Unit N/A