{"schemaVersion":1,"slug":"fast-earthing-switch-functional-reference","name":"Fast earthing-switch functional reference","kind":"symbol","abbreviation":"FEFR","aliases":["Disconnector and earthing applications","switchyards Disconnector and earthing applications","switchyards","Switchyards","Assigned fast-earth command","Fast earthing action"],"category":"power-distribution","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Identifies the assigned high-speed earthing function in its documented primary application.","description":["Identifies the assigned high-speed earthing function in its documented primary application. Disconnector and earthing references identify different mechanical constructions and connection duties within a yard. The primary diagram shows which conductors are joined or earthed; the equipment drawing explains how its contacts and supports move.","In a switchyard bay, a bus selector can use a different physical construction from a line disconnector. Each device still needs an identified operating mechanism, position indication and interlocking interface. For this reference, the drawing identifies “Assigned fast-earth command” at the input and “Fast earthing action” at the output. Making duty and application require equipment-specific validation.","The construction name does not establish load-breaking capability, short-circuit making duty or operating permission. Verify these properties in the selected equipment data and the station interlocking scheme. 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: Assigned fast-earth command. Identify its source device or document and the state represented on the drawing.","Follow the named output: Fast earthing action. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Making duty and application require equipment-specific validation.","The construction name does not establish load-breaking capability, short-circuit making duty or operating permission. Verify these properties in the selected equipment data and the station interlocking scheme."],"drawingChecklist":["Label the source and connection reference for assigned fast-earth command.","Identify the destination and defined state of fast earthing action.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Making duty and application require equipment-specific validation."],"distinction":"Making duty and application require equipment-specific validation. 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":"Assigned fast-earth command"},{"label":"Output / connection","value":"Fast earthing action"},{"label":"Lookup label","value":"FEFR is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-disconnectors","relevance":"Public technical context for disconnector and earthing applications. Disconnector construction, earthing switches and operating mechanisms. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["disconnector","earthing-switch","disconnector-grouped-pole-operating-reference"],"artwork":"pi26-fast-earthing-switch-functional-reference","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"switchyards","family":"yard-disconnectors","input":"Assigned fast-earth command","output":"Fast earthing action"},"plainEnglish":{"title":"What this block does","introduction":"Identifies the assigned high-speed earthing function in its documented primary application.","example":"In a switchyard bay, a bus selector can use a different physical construction from a line disconnector. Each device still needs an identified operating mechanism, position indication and interlocking interface. For this reference, the drawing identifies “Assigned fast-earth command” at the input and “Fast earthing action” at the output. Making duty and application require equipment-specific validation.","drawings":"Start at the named input: Assigned fast-earth command. Identify its source device or document and the state represented on the drawing. Follow the named output: Fast earthing action. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Assigned fast-earth command"},{"name":"Output","meaning":"Fast earthing action"},{"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":["Assigned fast-earth command","FEFR","Fast earthing action"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"Disconnectors and earthing switches","url":"https://www.siemens-energy.com/global/en/home/products-services/product-offerings/disconnectors-earthing-switches.html"}],"profileId":"power-installation-yard-disconnectors"},"url":"https://eloragrid.ai/symbols/fast-earthing-switch-functional-reference","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/fast-earthing-switch-functional-reference.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pi26-disconnectors","publisher":"Siemens Energy","title":"Disconnectors and earthing switches","url":"https://www.siemens-energy.com/global/en/home/products-services/product-offerings/disconnectors-earthing-switches.html","scope":"Disconnector construction, earthing switches and operating mechanisms.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"Public technical context for disconnector and earthing applications. Disconnector construction, earthing switches and operating mechanisms. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}