Bare copper wire refers to a single strand of copper wire that does not have an extra coating. The wire consists of 99.99 percent pure copper and can be used as a single wire in ground conductors, hook-up wiring, and jumper cables. Bare copper is also used in multi-strand solid and stranded copper conductorsA bare copper earth wire, also known as a bare copper grounding wire or bare copper earthing wire, is a type of electrical conductor specifically designed for grounding and earthing systems. It consists of a solid or stranded copper wire without any insulation or protective covering.