In engineering corpus there is a thought that about grounding everything has been said. We believe that it isn’t so and because of that the purpose of this paper is, by the laws of reliability, to start stronger thinking about grounders as relevant elements of every electric circuit. Major consideration here is grounding system of electro energetic object, to be more precise city TS 10(20)/0.4 kV. No major relevance is given to TS grounders since project task through projecting to maintenance in field. With this paper we are trying, with a different approach, to open a new view on usual methods of determination of that important part of electro energetic system. In chapter B) The reason and the plan of research, the reasons of approach to conduct this paper are explained and exact questions are asked on which exact conclusions are required. The plan of research explains which data and from whom should be collected, what to analyze and on what way to conduct the measurement. It is also determined to which calculations results should be found. Chapter C) About reliability of TS 10(20)/0.4 kV, gives theoretical view of reliability which is applied in our system of grounding. Models of reliability, which are available from literature, are processed and on the end the calculation of characteristic variables of components and the TS 10(20)/0.4 kV grounding system is done. In chapter D) About grounding of TS 10(20)/0.4 kV, the major pointers of groundings in general are given, theirs characteristics and influences on resistance of expansion. It is thurally introduced with typical (average) city TS and her’s characteristics. Single pole schematics and picture of grounding system is enclosed. The calculation of protection and working grounding system is also done for possible comparisment of given values with measured values of grounding resistance on TS in work. Next chapter E) The conduct and results of research, gives a view into schematics of the TS 10(20)/0.4 kV network on which the research were conducted. It shows tablically sorted data about characteristics of earlier mentioned TS’s and likewise sorted data of measured values on expansion resistance of grounders. The measuring ways during measuring of the grounding resistance are also shown and the table of measured values together with graph of portions of average measured values of TS grounding, her’s systems and components is given. Chapter F) Final considerations, shows the analysis of accomplished results and calculations with measured values. The conclusions are made on given themes from chapter B) the reason and the plan of research. The view on maintenance and work of the grounding facility is given.