Use Porcelain Insulators
Moulded insulators have verticle seams that can get contaminated and form a path of reduced surface insulation strength. Once a path of reduced surface insulation strength is formed, even a slight peak in line voltage can begin short arcs that can elongate along a moulded seam. (Little arcs form ozone, which is a gas that provides a medium to conduct relativly high voltage.) The short arcs growing longer furnish a path that can result in flashover, which burns the surface just as is shown in the picture associated with this article.
Biting the hand that feeds IT
