Final paper describes the elements, construction, structure and role of a low voltage network in an electric power system. In addition to the theoretical description of low-voltage distribution networks, the paper also contains a calculation of electricity flow and short circuit made using a software tool. The final work consists of seven main chapters, namely: "Introduction", "Types of low voltage networks", "Elements of low voltage networks", "Structure of low voltage networks and substations", "Calculation of low voltage networks load", "Protection measures in low-voltage networks and “substations”, “Analysis of the actual low-voltage network using software tools.” Each of the above chapters deals with and answers the questions posed in the last task. The first chapter of the paper is: "Introduction". In the introductory chapter, the reader is basically introduced to the role of the low-voltage network in the overall electricity network and its basic elements and characteristics. The second chapter of the paper is: "Types of low voltage networks". The second chapter shows the basic division of low voltage networks. Also, in addition to the basic division, the division of low voltage networks with respect to the grounding of the transformer station and the abbreviations that describe the method of grounding the transformer station are explained. The third chapter of the paper is: "Elements of low voltage networks". This chapter describes all the elements that can make up a low voltage network. First, overhead and cable lines are described, then the elements that make up low-voltage lines (poles, conductors, foundations, insulators, grounding) are described in particular. After the lines, low-voltage transformers located in transformer stations are described and it is explained what they are made of and what function the individual parts have. The chapter also describes low voltage consumers and their basic characteristics. Along with consumers, the daily load diagram is explained, ie what is displayed and how it is obtained. At the end of the chapter, other elements that can make up a low-voltage network are described, namely inductors and capacitor banks, and it is explained what their role is in the network. The fourth chapter of the paper is: "Structure of low voltage network". This chapter describes the basic structure of a low voltage network and the topological forms of a low voltage network. The basic topological forms are listed and their mode of operation is explained. In addition to the explanation of the mode of operation, schemes of individual forms are also presented. In addition to topological forms, transformer stations and the elements from which they are built are also described. The fifth chapter is: "Low voltage network load calculation". This chapter describes the process of calculating the load of end consumers in the low voltage network (households, public lighting and other consumers). In addition to the procedure for calculating the load on consumers, the fifth chapter also describes the procedures for calculating the reactive power, the peak current load of the low-voltage terminal and the procedure for selecting the minimum power of the transformer. At the end of the chapter, the procedure of dimensioning low-voltage terminals according to basic and additional criteria is explained. The sixth chapter of the paper is: "Protection measures in low voltage networks and substations". The sixth chapter describes the protective measures by which we protect the low-voltage network from contact voltages, current loads, overvoltages, mechanical or thermal stresses and fire. In addition to describing protective measures, this chapter also describes protective devices in the low voltage network. At the end of the chapter, it describes the working and protective earthing and the elements that make up the earthing system. The seventh chapter of the paper is: "Analysis of a real low voltage network using a software tool". The last chapter refers to the practical part of the final work. At the beginning of the chapter, the scheme and technical description of the given real low voltage network are presented. In addition to the technical description of the given real network, the results of the calculation of power flows and short circuit from the software tool used for the analysis are presented.