What is the primary advantage of hard drawn copper for overhead line purposes?

The primary advantage of hard drawn copper for overhead line purposes is its greater strength. Hard drawn copper has undergone a process that enhances its tensile strength, making it more durable and capable of withstanding the mechanical stresses it encounters in overhead applications. This strength is crucial for power transmission lines, which must resist environmental factors such as wind, ice, and temperature fluctuations. The increased strength of hard drawn copper allows for longer spans between support structures and a reduced likelihood of sagging or failure under load.

While the other factors, such as conductivity, cost, and flexibility, do play a role in the overall assessment of materials used for electric lines, the emphasis on strength in this context aligns with the demands of overhead installations where structural integrity is paramount.