The thesis describes the requirements for low voltage installations, which are given in the technical guidelines for the construction of facilities. The introductory part describes the basics and types of legislation. There are also definitions for technical regulations, standards and technical guidelines, and who writes and passes them. Further on there is a presentation of the basic requirements for low-voltage installations, which are written in various technical guidelines, and the assessment of guidelines conformity. In the final part the author expresses the view that the guidelines, which refer to low-voltage installations, could be improved, as he has perceived deficiencies.