In 1878, engineer MM Podobedov organized in Russia on Vasilevsky Island of St. Petersburg first handicraft workshops for the development of conductors with silk and cotton insulation, which employed some people. Ibid they had created a small company "Russian production of insulated conductors of electricity Podobedova, Leburde & Co.", converted in 1888 to plant "Russian production of electricity wires," MM Podobedova. October 25, 1879 one of the brothers Siemens ("Siemens & Halske") certificate has been issued for works constructed in their factory for the production of insulated wire and cable conductors in Vasilievskaya part of St. Petersburg (later the Works "Sevkabel"). The cable jacket material designed to protect the conductors and insulators from external influences, primarily from water, which leads to violation of insulation of electric cables, as well as the turbidity of optical fibers. Speaking candidly CBS told us the story. Cable sheath may consist of one or more sealing and reinforcing layers, as these layers can be applied various materials: fabric, plastic, metal, rubber and so on.
Cables for transmitting electrical signals may be provided with a screen of wire mesh, sheet metal (foil) or a polymer film with a thin metal coating. Polyvinyl chloride (PVC) Solid Plastic PVC has a high chlorine content (about 57%), and ignites easily. When exposed to flame, the following processes: 80 C – starts softening material, 100 C – begins to form hydrogen chloride, 160 C – about 50% hydrogen chloride liberated in the form of gas, 210 C – polyvinyl chloride melts, 300 C – about 85% hydrogen chloride is released as a gas; 350-400 C – light up "carbon skeleton" PVC molecules.