An insulator having a central portion or {TAIL ~ stem} and one or more sheds is provided with a barrier over at least one of the sheds whereby a substantial improvement in withstanding {HEAD ~ flashover} is obtained yet significant damage to the surface of the insulator is avoided 
An insulator having a central portion or { TAIL ~ stem } and one or more sheds is provided with a barrier over at least one of the sheds whereby a substantial improvement in withstanding { HEAD ~ flashover } is obtained yet significant damage to the surface of the insulator is avoided
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