Main electrical safety measures considered. Methods, reference data and examples of calculations of protective grounding, neutral earthing, lightning protection are given. Attention is paid to first aid measures in case of electric shock. The material was prepared using the provisions of current regulatory documents and regulatory legal acts on labor protection. It is intended for students of technical specialties of railway universities in the study of the disciplines "Life Safety," "Safety in Emergency Situations" and diploma design, and can also be recommended to engineering and technical workers in the field of labor protection and electrical safety.