Section 125.30 - Underground Transmission Lines Location(1)General Location. Underground systems of electric conductors should be located so as to be subject to the least practicable disturbance. Railway tracks and underground structures, including catch basins, gas pipes, etc., should be avoided where practicable.(2)Ducts. The ducts between adjacent manholes or other outlets should be laid as straight and direct as practicable. A minimum of 24 inches cover should be maintained where practicable.(3)Manholes. Manhole openings, where practicable, shall be located so as to provide safe and convenient access. At crossings under railroads, the manholes, pull boxes, and terminals should, where practicable, be located away from the roadbed.