{HEAD ~ An insulator} having {TAIL ~ a central portion} or stem and 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 
having
{ HEAD ~ An insulator } having { TAIL ~ a central portion } or stem and 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
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH