The manufacturer of ACSR tells you under what circumstances should you install a door entry pole?
When the entry point of low buildings is lower than 2.7m from the ground, the entry pole shall be installed. The plastic sheathed wire shall be used to pass through the porcelain pipe, the insulated wire steel pipe or the hard plastic pipe. If conditions permit, the plastic sheathed wire, the steel pipe or the hard plastic pipe shall be supported on the high wall of the adjacent buildings, or the entry pole may not be installed.