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