How insulators are classified based on use?

1. Transmission line insulators
a. Disc insulators
b. Long rod insulators
c. Line post insulators
2. Substation insulators
a. Solidcore insulators
b. Hollow insulators
3. Traction insulators
Stay arm, Bracket, 9 ton, operating rod etc.
4. Distribution insulators
Pin, shackle, guy strain etc.