{"schemaVersion":1,"slug":"earth-grid-conductor","name":"Earth grid conductor","kind":"symbol","abbreviation":"EG","aliases":["earth mat","earthing grid","buried earth conductor"],"category":"connections-wiring","drawingTypes":["GA"],"referenceFamilies":["IEC","IEEE / ANSI"],"summary":"A buried horizontal earthing conductor forming part of a substation or plant earth grid, drawn on layout plans.","description":["Earth grid conductors are bare horizontal conductors buried under substations and plant areas to control step and touch voltages during faults. Layout drawings show them as a distinct line style, with crossings, connections to equipment and rods marked along them.","The symbol does not show conductor size, burial depth or jointing method, which come from the earthing design. A line drawn on a plan may also not indicate whether crossings are bonded; connection marks at each crossing are needed. Above-ground risers to equipment are usually shown separately."],"readingNotes":["Check crossings for bond marks.","Look for risers to each equipment item."],"drawingChecklist":["State conductor size and burial depth.","Mark bonded crossings.","Show risers to equipment."],"distinction":"An earth grid conductor is a buried horizontal conductor; an earth electrode is a rod or plate in the soil.","facts":[{"label":"Graphic cue","value":"Distinct line style on a site plan with bonded crossings"},{"label":"Design driver","value":"Step and touch voltage control"},{"label":"Preview","value":"Original educational illustration; consult the publisher and applicable standard for the exact graphic"}],"references":[{"sourceId":"s28-eig-earthing-connections","relevance":"Public installation-guide earthing connection elements."},{"sourceId":"pub-object-engineering-design","relevance":"Installation design methodology references."}],"related":["iec-earth-electrode","ga-earth-bar","protective-equipotential-bonding"],"artwork":"s28-earth-grid-conductor","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","plainEnglish":{"title":"What does Earth grid conductor mean?","introduction":"Earth grid conductors are bare horizontal conductors buried under substations and plant areas to control step and touch voltages during faults. Layout drawings show them as a distinct line style, with crossings, connections to equipment and rods marked along them.","example":"The symbol does not show conductor size, burial depth or jointing method, which come from the earthing design. A line drawn on a plan may also not indicate whether crossings are bonded; connection marks at each crossing are needed. Above-ground risers to equipment are usually shown separately.","drawings":"Check crossings for bond marks. Look for risers to each equipment item. An earth grid conductor is a buried horizontal conductor; an earth electrode is a rod or plate in the soil.","terms":[{"name":"Terminal","meaning":"An identified point where a conductor connects."},{"name":"Rating","meaning":"A value stating the conditions for which equipment is specified."},{"name":"Schematic","meaning":"A drawing showing function and connections rather than physical appearance."}],"diagram":"flow","steps":["Identify the device and form","Read the connections and state","Check the equipment reference"],"caption":"A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.","sources":[{"label":"Earthing connections","url":"https://www.electrical-installation.org/enwiki/Earthing_connections"},{"label":"Electrical installation design methodology and references","url":"https://www.electrical-installation.org/enwiki/General_rules_of_electrical_installation_design"}],"detail":"A buried horizontal earthing conductor forming part of a substation or plant earth grid, drawn on layout plans. An earth grid conductor is a buried horizontal conductor; an earth electrode is a rod or plate in the soil.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/earth-grid-conductor","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/earth-grid-conductor.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"s28-eig-earthing-connections","title":"Earthing connections","publisher":"Schneider Electric, Electrical Installation Guide","url":"https://www.electrical-installation.org/enwiki/Earthing_connections","type":"manufacturer","scope":"Definitions of earth electrode, main earthing terminal, removable test link and bonding conductors in an installation earthing arrangement.","checkedOn":"2026-10-28","reuse":"link-only","relevance":"Public installation-guide earthing connection elements."},{"id":"pub-object-engineering-design","title":"Electrical installation design methodology and references","publisher":"Schneider Electric — Electrical Installation Guide","url":"https://www.electrical-installation.org/enwiki/General_rules_of_electrical_installation_design","type":"manufacturer","scope":"Public design context. No universal working clearance, equipment dimension or project compliance conclusion is asserted.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Installation design methodology references."}]}