Busbars having different cross sections for a busbar system with a common protection or neutral conductor

An embodiment of the invention relates to busbars having different cross sections for a busbar system with a common protection and/or neutral conductor for the transport of electrical energy. The busbar system includes at least one first segment and a second segment, the segments having each at least one first busbar with a first cross-sectional area, at least a second busbar with a second cross-sectional area, a holding element and at least one connection. According to an embodiment of the invention, the busbars of the segments are held by the respective holding element and are electrically connected to each other via the at least one connection, and a busbar from either the first busbars or second busbars serves as a common protection conductor and/or as a common neutral conductor.