Heavy, uninsulated conductor that carries a large current and connects numerous electrical circuits is called

• A. Bus Duct
• B. Bus Bar
• C. Conductor Wire
• D. Jumper

Answer: (B)

Heavy, uninsulated conductors used to carry large currents and connect many circuits are called bus bars. A bus bar is a thick, rigid conductor—usually a flat bar made of copper or aluminum—mounted inside switchgear or distribution panels. Its purpose is to provide a single, low-impedance path that distributes power from the main source to multiple outgoing circuits, so it must be capable of carrying substantial current with minimal voltage drop. Because it is designed to serve as the common feed for many circuits, the term fits better than the other options.

Bus ducts are enclosed, modular assemblies that route power inside equipment; conductor wire is typically insulated and used for individual circuits; a jumper is a short link used to bridge short gaps. None of these match the description of a heavy, uninsulated main conductor that ties numerous circuits together like a bus bar.