Overhead cables are insulated from pylons through

Examples of ceramics are clay, bricks, tiles, glass, and cement.

Overhead cable is insulated from pylons through ceramics and glass.

The overhead power lines that are supported by pylons are not covered in insulating materials. However, ceramics or glass insulators are fitted between pylons and wires. This stops electricity flowing down the metal pylons to the ground, where it could hurt or even kill people or animals.