Bi-metallic lugs are common in electrical installations due to the fact that they offer a safe, efficient, and dependable means of joining two dissimilar types of conductors—usually aluminum cables to copper bus bars or terminals. The reason for their application is primarily to prevent problems occurring when dissimilar metals are connected directly. When copper and aluminum are in d... https://www.pioneerpowers.com/bimetallic-lugs-and-connectors.php