The most basic difference lies in their physical location.

• An overhead distribution line consists of bare or insulated conductors suspended on structures like utility poles, typically visible and accessible above ground. This system is the traditional method of power distribution and is widely used due to its lower cost and easier maintenance access.

• An underground distribution line consists of insulated cables that are buried in trenches or pulled through conduits below the ground. This system is often preferred for its improved aesthetics, public safety, and enhanced reliability against weather and external damage.