A bus bar (also spelled busbar) is a metallic strip or bar used in electrical power distribution to conduct electricity within a switchboard, distribution board, substation, or other electrical apparatus. Its primary role is to carry large current loads and connect multiple circuits together. This makes it the backbone of any power distribution system. It compares copper and aluminium busbars, noting copper's superior electrical performance and aluminium's lighter weight and lower cost. Single Busbar System: It is simple and cost-friendly, and it is used in small panels.