Various types of schemes are described and their purpose is explained. Basic techniques for composing simple element diagrams and marking primary and secondary circuits are shown. Examples of element diagrams of individual drives control, samples of mounting diagrams and diagrams of external connections are given. A number of changes and additions have been made to the second edition in connection with new solutions to a number of issues and the introduction of more advanced electrical equipment. Various types of complete devices and technical documentation necessary for their ordering are considered. The brochure is intended for electricians performing installation of complete devices and electrical equipment.