Higher voltages are more efficient for transmitting electricity over long distances because they minimize power loss. This is why transmission lines use HV and EHV. However, higher voltages require specialized equipment and designs to ensure safety and reliability. For example, higher voltages require larger insulators and greater clearance from the ground and other objects.

Conversely, lower voltages are used for local distribution where efficiency is less of a concern and safety for the public is a higher priority. The equipment used for these lines, such as smaller poles and different types of insulators, reflects this difference in purpose and safety requirements.