Professional Answer: The key difference lies in their purpose and voltage levels. transmission lines are designed for long-distance, high-voltage bulk power transfer from power plants to substations. To minimize energy loss over vast distances, they operate at voltages typically from 69 kV to 765 kV. Distribution lines, conversely, operate at much lower voltages (usually 4 kV to 69 kV) and are responsible for the final delivery of power from local substations to individual consumers. Our company specializes in the equipment required for both, providing heavy-duty stringing equipment for overhead transmission lines and a wide range of tools for both overhead and underground distribution projects.