Our Professional Answer: A key differentiator is the voltage level used. To minimize energy loss over long distances, electricity is "stepped up" to very high voltages for transmission (typically 115 kV and above). This high-voltage power is carried by thick overhead lines supported by large metal towers.

For distribution, the high voltage is "stepped down" at a substation to lower, safer levels (generally 34 kV or less). This power is then routed through local networks, which often use smaller, wooden utility poles for overhead lines or underground cables in urban areas.

As a manufacturer of both overhead and underground equipment, Ningbo Changshi provides the essential tools for constructing and maintaining both types of infrastructure, from the towering transmission lines to the local distribution networks.