УДК 621.315.622, DOI: 10.22184/2070-8963.2020.90.5.72.79

With the development of telecommunications in the 19th century, overhead lines, designed to transmit electrical signals through wires suspended on special supports and became widespread. To strengthen the wires on the supports, various types of insulators and fittings were used, on the reliability of which the reliability of the communication line as a whole depended to a large extent. The second part of this work provides a historical and technical review of the designs of double-sleeve pin insulators, methods of attaching wires, as well as fittings for strengthening insulators on supports.