The most commonly used material for overhead transmission line insulators is

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Electrical Engineering MCQs on Power System Protection

The most commonly used material for overhead transmission line insulators is:

  1. Glass
  2. Steatite
  3. Porcelain
  4. None of these

Correct answer: 3. Porcelain

Explanation: The most commonly used material for insulators of overhead line is porcelain. Porcelain is stronger mechanically than glass, it gives less trouble from leakage and is less affected by changes of temperature. Therefore porcelain is preferred as compared to other materials.

Also see: 5 Types of Conductors used in transmission lines

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