New device reduces conductor burndown on distribution circuits

Laboratory tests of an arcing clamp-type device indicate that it gives more protection against conductor burndown on covered distribution circuits. Experiments were designed to study the effects of direct lightning strokes and examine damage characteristics. This led to the conclusion that conventional overcurrent protection devices having high continuous current ratings were inadequate to prevent burndown and some kind of phase conductor protection was needed. Tests indicate that aluminum clamps installed on both sides of a stripped cover provide a lightning flashover path. (DCK)