Three materials used for overhead line insulators are porcelain, polymer, and ?

Three materials used for overhead line insulators are porcelain, polymer, and ?

• A. Fiberglass
• B. Glass
• C. Glass-lined wood
• D. Nylon-reinforced plastic

Answer: (B)

Overhead line insulators are categorized by material into porcelain, glass, and polymer. The missing material is glass, a traditional insulator material alongside porcelain. Porcelain and glass have long histories as solid, rigid insulators, while polymer insulators are a newer, lighter option with different performance traits. Among the choices, glass fits the established trio of insulator materials. Fiberglass is typically a reinforcing core used inside some polymer insulators rather than a separate insulator material, and glass-lined wood or nylon-reinforced plastic aren’t standard categories for overhead line insulators.

Overhead line insulators are categorized by material into porcelain, glass, and polymer. The missing material is glass, a traditional insulator material alongside porcelain. Porcelain and glass have long histories as solid, rigid insulators, while polymer insulators are a newer, lighter option with different performance traits. Among the choices, glass fits the established trio of insulator materials. Fiberglass is typically a reinforcing core used inside some polymer insulators rather than a separate insulator material, and glass-lined wood or nylon-reinforced plastic aren’t standard categories for overhead line insulators.