This edition is devoted to the design of overhead power lines of 0.38-20 kV with self-supporting isolated and protected wires. The use of self-supporting insulated and protected wires is by far the most progressive and promising way to develop electric distribution networks. The high economic efficiency of the use of such wires is achieved due to a significant increase in the reliability of electricity supply to consumers and a sharp reduction in operating costs compared to non-insulated wires. It consists of four books .. Book 1 - A system of self-supporting insulated wires up to 1kV without a separate supporting element. Book 2 - A system of self-supporting isolated wires up to 1 kV with an isolated zero-carrier conductor. Book 3 - System of self-supporting insulated wires up to 1kV with non-insulated zero-carrier conductor. Book 4 (in 2 volumes) - 6-20kV secure wire system.