A system for isolating a power conductor includes a power conductor that extends between first and second flanking support structures. First and second collars are connected respectively to the first and second flanking support structures. The first and second collars each at least partially surround the power conductor and including respective first and second open tracks that cooperate with each other to define a sheet-receiving slot. An electrically insulating/insulative sheet is located in the sheet-receiving slot and extends continuously between the first and second collars. The sheet is secured in covering relation with the power conductor.