Transactions on Machine Design Yoncho Kamenov, Yulian Rangelov and Angel Vrangov 11 1 2023 https://doi.org/10.6025/tmd/2023/11/1/20-26 https://www.dline.info/tmd/fulltext/v11n1/tmdv11n1_4.pdf We have created the overhead transmission line mechanical design with the help of the linear expansion of the thermal resistant conductors. These conductors are characterized by the regular current flows. We have recorded the thermal resistant conductor at various tension levels and temperatures. The experimental results have been posted with data at many transmission lines.