Support System 1 : A structure such as underpinning, bracing, or shoring, that provides support to an adjacent structure, underground installation, or the sides of an excavation
US Department of Labor, OSHA Construction eTool: Glossary (General Construction: electrical Incidents, Falls, Struck-By, Trenching And Excavation) Occupational Safety & Health Administration OSHA, Washington, D.C., USA 2010. https://www.osha.gov/SLTC/etools/construction/glos sary.html, (OSHA/Gen Const - Amer) {615}