Give two difference overhead and underground transmission system? All Questions › Category: Transmission And Distribution System › Give two difference overhead and underground transmission system? 0 Vote Up Vote Down CS Electrical And Electronics Staff asked 4 years ago I need short information. 1 Answers 0 Vote Up Vote Down CS Electrical And Electronics Staff answered 4 years ago Underground cables: Costlier installation and maintenance is difficult. Overhead lines: Economically good and easy maintenance.