Which of the following is NOT a finish covering type?

• A. PVC cladding
• B. Canvas
• C. Metal
• D. Fiberglass

Answer: (D)

Finish coverings are the outer layers that protect an insulator from weather, pollution, and mechanical wear. PVC cladding sits on the outside to provide a weatherproof, durable surface. Canvas can be used as a protective wrap in some setups, offering simple, breathable coverage. Metal coverings give strong, rigid protection against impacts and harsh environments. Fiberglass, however, is typically used as a body material in certain composite insulators rather than as a separate finish applied on top. It’s the material that forms part of the insulator’s structure, not a finish wrap, so it’s not considered a finish covering type.