Underground Transmission Lines : These lines are becoming more common, especially in highly populated area. They may be buried with no protection, or placed in conduit, trenches, or tunnels
US Department of Labor, Electric Power eTool: Glossary of Terms, Occupational Safety & Health Administration OSHA, Washington, D.C., USA 2010. https://www.osha.gov/SLTC/etools/electric_power/gl ossary.html, (OSHA/ Electr Pwr - Amer) {618}
