Which of the following is NOT a type of bus bar?

The option that is not recognized as a standard type of bus bar is Control Bus Bar (CBB). Bus bars serve as conductive paths that distribute electrical power within electrical systems, and they come in well-defined categories such as Primary Bus Bar (PBB), Secondary Bus Bar (SBB), and Rack Bus Bar (RBB).

The Primary Bus Bar typically carries the main current from the power source, while the Secondary Bus Bar is used to distribute power to various circuits or devices. The Rack Bus Bar is specifically designed for equipment racks that house various electronic components.

Control Bus Bars, however, are not standard terminology in electrical distribution systems. Typically, control circuits are handled separately from power distribution systems, which is why the term Control Bus Bar does not fit within the established types of bus bars. Understanding the roles of these true bus bar categories helps clarify why the Control Bus Bar does not belong in that classification.