Which function is attributed to the glaze on porcelain insulators?

Which function is attributed to the glaze on porcelain insulators?

• A. Increases mechanical strength
• B. Reduces weight
• C. Improves electrical conductivity
• D. Sheds dirt and beads water

Answer: (D)

Glaze on porcelain insulators creates a smooth, non-porous surface. That slick surface makes rainwater bead up and run off, and it helps dirt and contaminants wash away more easily. Keeping the surface cleaner and drier reduces the formation of a conductive moisture film, which helps the insulator maintain better insulation in wet conditions. The glaze isn’t meant to add strength, reduce weight, or improve conductivity; its main role is to shed dirt and bead water, preventing moisture and grime from sticking and spreading.