Overhead distribution line is a distribution line which uses pole to suspend the conductor and directly supplies power to the user. A single switch (mostly on a pole) is set at the sectional point of each line on an overhead distribution line. In order to make use of the overhead corridor effectively, the same pole and frame are mainly used in the urban area. There are double-back, four-way same-pole frame; there are also 10 kV 380V row up and down the same pole frame.