In this final paper, based on the available literature, various aspects of electricity quality are briefly reviewed, with special attention paid to the influence of the characteristics of the grounding system on the quality of electricity. Electricity is a commodity traded on the open market, which must meet the given quality criteria. Therefore, the main part of this paper is dedicated to the basic characteristics of electricity quality, the basics of the grounding system and the methods of measuring the disturbances themselves, as well as the quality of electricity itself. In the second chapter, in addition to the concept of electricity quality, some of the standards related to quality are described, namely the purpose and characteristics of these standards. The third chapter refers to the characteristics of electricity quality. A detailed description of the characteristics of all parameters is given here. In the fourth chapter, the influence of the grounding system on the quality of electricity is discussed, since the grounding system and the method of grounding have a great influence on the quality of electricity. In the fifth chapter, methods of measuring the quality of electricity are discussed, with a description of the capabilities of existing devices for measuring the quality of electricity. Power quality monitoring requires specially developed methods for calculating power quality characteristics and clearly defined limits for these characteristics for comparison with measured values. In the same chapter, some of the methods of power quality monitoring using newer devices such as the FLUKE 435 are described.