The invention relates to a bus system comprising a bus master (10), at least two bus components (20, 20') and a bus (30) which connects the bus components (20, 20') to the bus master (10), wherein the bus (30) has at least one data line (32) and at least one power supply line (31), characterised in that the at least one data line (32) connects the bus master (10) to all bus components (20, 20'), and the at least one power supply line (31) connects the bus master (10) to a first bus component (20) and is looped through the first bus component (20) to a further bus component (20'), wherein inside a bus component (20, 20') at least one switching element (25) is connected into the power supply line. The invention further relates to a method for assigning addresses in a bus system of this type.