The work shows a model of a low voltage line (LV), loaded asymmetrical (asymmetry load), feeding scattered customers. The object of the research is an LV line supplying rural customers. Analysis of the tests results of the built model allows among others, evaluation of the values that characterise the quality of the electricity supplied to customers and the parameters that describe the objective of the research. In order to assess the quality of electricity (provided to customers) the algorithm calculation was compiled and on the basis of the developed model, it is possible to calculate the values of voltage sags and deviations on the individual points of the line. In addition, it enables the designation of the asymmetry of voltage (the coefficients of voltage asymmetry). The figures characterising the quality of electricity can be appointed to different parameters describing an LV, inter alia, distribution of customers along the line, what type of customers are connected to the line (productive and unproductive), the nature and extent of the load and the degree of load asymmetry.