A method for determining a topology information item on a low-voltage electrical distribution system. A group of at least two current measuring devices that are arranged at different points in the low-voltage distribution system is selected, and in each case the current is measured by the current measuring devices so as to form a current measurement value. The current measurement values are added so as to form a current sum taking into consideration the current flow direction. A topology information item is formed which specifies that the current measuring devices electrically isolate a load-free and source-free section of the low-voltage distribution system when the current sum, in terms of absolute value, falls below a predetermined threshold value.