Discussion
Which of the following materials is NOT suitable for pin insulators?
Answer: D
Pin insulators carry the line conductor on a pin fixed to the cross arm, and they must be made of an electrical insulating material that is also strong in compression and weatherproof. Porcelain, other ceramics and silicon rubber (a polymer used in composite insulators) are insulators and are suitable.
Copper is a very good conductor of electricity, so it would short the line to the cross arm and cannot be used. The answer is copper, option D.
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