Method and device for measuring the impedance in an electrical energy supply network

The low voltage (LV) network supply stage (7) has a switch component (17,32,33) and/or measuring element (10,22,35a) for each of the electrical loads (3-5) and/or energy generators (6) within the supplied building and a microprocessor information processing device (25), allowing bidirectional communication between an external network control point (28) and the electrical loads and/or energy generators.