Ground

{
  "id": "MLC-T-ENV-012649",
  "term": "Ground",
  "field": "Environment",
  "definition": "1. Emissions or resources from the solid phase of the earths crust [Original source: https://cfpub.epa.gov/si/si_public_record_Report.cfm?dirEntryId=347251&Lab=NRMRL].\n\n2. An electrical connection to earth through an earth-electrode subsystem.\n\n3. In an electrical circuit, a common return path that usually (a) is connected to an earth-electrode subsystem and (b) is extended throughout a facility via a facility ground system consisting of the signal reference subsystem, the fault protection subsystem, and the lightning protection subsystem.\n\n4. In an electrical circuit, a common return path that (a) may not necessarily be connected to earth and (b) is the zero voltage reference level for the equipment or system.",
  "references": [
    "Federal LCA Commons Elementary Flow List for Life Cycle Assessment",
    "General Services Administration Federal Standard 1037C, Glossary of Telecommunication Terms, 1996"
  ],
  "url": "https://mlchart.com/terminology/environment/ground/"
}