The construction, installation, maintenance, or repair of electrical transmission and distribution lines, poles, and towers for outside the plant. Also includes electrical power substations and all internal components, including transformers, circuit breakers, reclosers, switches, fuses, rigid, strain, and overhead bus structures, insulators, wave jumpers, wave traps, and related electrical transmission towers within or leading directly to the substation. A license is required when the value exceeds $10,000. Electrical transmission lines is a subclassification of Electrical and Heavy Construction.