{"schemaVersion":1,"slug":"surge-arrester-earth-lead-interface","name":"Surge-arrester earth-lead interface","kind":"symbol","abbreviation":"SEI","aliases":["Switchyard earthing and lightning interfaces","switchyards Switchyard earthing and lightning interfaces","switchyards","Switchyards","Arrester earth terminal","Station earthing network"],"category":"power-distribution","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Identifies the earth connection serving the selected primary surge arrester.","description":["Identifies the earth connection serving the selected primary surge arrester. Earthing and lightning interfaces identify the connections between equipment metalwork, primary protection devices and the station earthing network. Their electrical purpose differs from their physical conductor route or electrode geometry.","In a switchyard arrangement, the earthing references help connect each primary equipment structure and surge-protection device to the correct earth-grid interface. Separate details show actual joints, sizes and installation routes. For this reference, the drawing identifies “Arrester earth terminal” at the input and “Station earthing network” at the output. Physical lead arrangement affects the application.","Name every connected item and the earthing design reference. The illustrative connection does not establish touch or step voltages, conductor sizing, lightning coverage or safe working conditions. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation."],"readingNotes":["Start at the named input: Arrester earth terminal. Identify its source device or document and the state represented on the drawing.","Follow the named output: Station earthing network. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Physical lead arrangement affects the application.","Name every connected item and the earthing design reference. The illustrative connection does not establish touch or step voltages, conductor sizing, lightning coverage or safe working conditions."],"drawingChecklist":["Label the source and connection reference for arrester earth terminal.","Identify the destination and defined state of station earthing network.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Physical lead arrangement affects the application."],"distinction":"Physical lead arrangement affects the application. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.","facts":[{"label":"Representation","value":"Functional block"},{"label":"Installation focus","value":"Switchyards"},{"label":"Input / boundary","value":"Arrester earth terminal"},{"label":"Output / connection","value":"Station earthing network"},{"label":"Lookup label","value":"SEI is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"s28-eig-earthing-connections","relevance":"Public technical context for switchyard earthing and lightning interfaces. Protective earthing, bonding and earth-electrode interfaces. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["iec-earth-electrode","lightning-down-conductor","surge-counter-earth-path-interface"],"artwork":"pi26-surge-arrester-earth-lead-interface","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"switchyards","family":"yard-earthing","input":"Arrester earth terminal","output":"Station earthing network"},"plainEnglish":{"title":"What this block does","introduction":"Identifies the earth connection serving the selected primary surge arrester.","example":"In a switchyard arrangement, the earthing references help connect each primary equipment structure and surge-protection device to the correct earth-grid interface. Separate details show actual joints, sizes and installation routes. For this reference, the drawing identifies “Arrester earth terminal” at the input and “Station earthing network” at the output. Physical lead arrangement affects the application.","drawings":"Start at the named input: Arrester earth terminal. Identify its source device or document and the state represented on the drawing. Follow the named output: Station earthing network. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Arrester earth terminal"},{"name":"Output","meaning":"Station earthing network"},{"name":"Application reference","meaning":"An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections."}],"diagram":"flow","steps":["Arrester earth terminal","SEI","Station earthing network"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"Earthing connections","url":"https://www.electrical-installation.org/enwiki/Earthing_connections"}],"profileId":"power-installation-yard-earthing"},"url":"https://eloragrid.ai/symbols/surge-arrester-earth-lead-interface","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/surge-arrester-earth-lead-interface.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 technical context for switchyard earthing and lightning interfaces. Protective earthing, bonding and earth-electrode interfaces. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}