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The use of reinforced concrete in buildings foundation as a ground electrode is not a new idea and has been common since the late 1960s. However, the number of available papers and technical reports that detail the implementation of that, and provide practical results for real case studies is not too many. The purpose of this paper is to describe the experiences gained from the design, implementation and field testing of a relatively large residential building’s concrete encased grounding electrode and to investigate if this electrode is able to meet the expectations of different aspects of a ground electrode. The paper shows methodology and all levels of testing for qualifying a real concrete encased grounding system in a typical large residential building, and can be considered as a pattern for similar cases, especially that concrete encased grounding system is not well known in Iran compared to American or European countries