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The handles of the tools like screwdrive...

The handles of the tools like screwdrivers and pliers used by electricians for repair work usually have plastic or rubber covers on them. Can you explain why?

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The handles of the tools like screwdrivers and pliers used by electricians for repair work usually have plastic or rubber covers on them because plastic and rubber are insulators .Electric current cannot conduct thorugh isulators . So , electricians would not get an electric shocj while repairing .
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