BC is the industry abbreviation for bare copper, which refers to a copper conductor that has no coating or insulation.
In commercial and industrial wiring, bare copper (BC) is valued for its excellent conductivity and flexibility. Unlike tinned or coated copper, BC has no surface treatment, making it suitable where oxidation is minimal or the conductor is protected by insulation or conduit. It is widely used as a grounding conductor, bonding wire, or as part of multi-conductor cable assemblies. Because it lacks insulation, BC is not intended for open-air current carrying unless used in a specified grounding path or approved cable design. Available in solid or stranded forms, BC remains a cost-effective choice for AV systems, fire alarms, building automation, and security wiring.
Applications of bare copper are regulated by the NEC (National Electrical Code) and evaluated by UL (Underwriters Laboratories) and IEEE (Institute of Electrical and Electronics Engineers) for compliance and safety.
Copper has been used as a conductor since the late 19th century for its superior conductivity and durability. The abbreviation “BC” became standard in wire and cable specifications to distinguish bare copper from other types, such as tinned copper (TC). Over decades of evolving electrical codes, BC has remained a cornerstone in grounding and bonding practices.