Abstract
This paper is aimed to the identification of the plastics used in the insulation of the conductors and the electrical cables and depending on their characteristics , the influence exercised on power losses in the dielectric of the cables . Solid organic synthetic insulating materials that are used in electrotechnics , represents a sensitive group larger than natural materials . According to current statistics , it is clear that solid synthetic materials are implemented in a majority share in achieving equipment and electrical installations insulation being in the configuration of generation, transmission and distribution of electricity systems. Keywords: plastic , polyvinylchloride , insulation, electrical cable , thermal stability