They are outside busbar older post Insulators, and switch and fuse case ones for 20 kV. The 3 shield Insulator is the older type, they are already rare, the 6 shield one is newer type, but they beganed decreade also. The providers like use epoxy Insulators only.
Some 0.4, 10 and 20 kV inside post Insulators. The using is universal.
The new epoxy plastic for 0.4, 10 and 20 kV. They are universal also.
Small 0.4 kV post Insulators..
20 kV fuse case for transformer poles.
