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Which of the following material is not used for overhead line insulators?

Which of the following material is not used for overhead line insulators? Correct Answer PVC

In addition to high insulation resistance and high relative permittivity, overhead line insulators must have high mechanical strength to bear the weight of line insulators, wind stress and ice loading if any. PVC have good insulation resistance but it does not have such mechanical strength so it is not suitable for overhead line insulators.

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