A power network having special junction boxes and an associated method for operation and evaluation which makes it possible, after construction and wiring, to recognise and to simulate the topology of the power distribution automatically is provided. On this basis the current consumption can then be determined in certain branches, for example also in a tree or ring network structure. In particular, deviations from the desired value, for example a disproportionately high current consumption, can be recognised and localised, so that as a consequence certain load and/or entire power network segments can be switched on and off. For analysis, the corresponding values of relevant electrical variables can be continuously observed, stored in a database, held for any period of time and displayed graphically. Connection errors, wire breakage and overload and undervoltage can be recognised and eliminated by analysing the values of the respective electrical variables.