This part of GB/T 755 specifies the general electrical test methods for insulators. This part applies to porcelain and glass insulators for AC systems (including porcelain bushings, post insulators, porcelain bushings for electrical products, and line insulators).
GB/T 775.2-2003 history
2003GB/T 775.2-2003 Test method for insulators Part 2: Electrical test methods