{"schemaVersion":1,"slug":"test-output-blocking-confirmation","name":"Test-output blocking confirmation","kind":"symbol","abbreviation":"TBC","aliases":["Switchgear test and commissioning interfaces","switchgear Switchgear test and commissioning interfaces","switchgear","Switchgear","Output-block feedback","Block-confirmed status"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Confirms that the assigned operating output block is present before a test initiation.","description":["Confirms that the assigned operating output block is present before a test initiation. A test interface separates measurement, command and indication paths so their behavior can be checked in the documented test configuration. The test boundary must show which real equipment outputs remain enabled.","In a switchgear relay panel, test links can separate a protective relay from the trip coils while maintaining the specified current-transformer secondary arrangement. For this reference, the drawing identifies “Output-block feedback” at the input and “Block-confirmed status” at the output. A software block and physical isolation differ.","Trace the source and destination on each side of the test boundary. Use the selected test-device instructions for actual operations and never infer a safe current-transformer switching sequence from an educational diagram. 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: Output-block feedback. Identify its source device or document and the state represented on the drawing.","Follow the named output: Block-confirmed status. Cross-reference its destination and separate the command from confirmation that the equipment responded.","A software block and physical isolation differ.","Trace the source and destination on each side of the test boundary. Use the selected test-device instructions for actual operations and never infer a safe current-transformer switching sequence from an educational diagram."],"drawingChecklist":["Label the source and connection reference for output-block feedback.","Identify the destination and defined state of block-confirmed status.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: A software block and physical isolation differ."],"distinction":"A software block and physical isolation differ. 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":"Switchgear"},{"label":"Input / boundary","value":"Output-block feedback"},{"label":"Output / connection","value":"Block-confirmed status"},{"label":"Lookup label","value":"TBC is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-masterclad","relevance":"Public technical context for switchgear test and commissioning interfaces. Breaker control, mechanism, position contacts, racking interlocks and test interfaces. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["relay-test-block","test-plug","control-circuit-continuity-test-boundary"],"artwork":"pi26-test-output-blocking-confirmation","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"switchgear","family":"testing","input":"Output-block feedback","output":"Block-confirmed status"},"plainEnglish":{"title":"What this block does","introduction":"Confirms that the assigned operating output block is present before a test initiation.","example":"In a switchgear relay panel, test links can separate a protective relay from the trip coils while maintaining the specified current-transformer secondary arrangement. For this reference, the drawing identifies “Output-block feedback” at the input and “Block-confirmed status” at the output. A software block and physical isolation differ.","drawings":"Start at the named input: Output-block feedback. Identify its source device or document and the state represented on the drawing. Follow the named output: Block-confirmed status. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Output-block feedback"},{"name":"Output","meaning":"Block-confirmed status"},{"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":["Output-block feedback","TBC","Block-confirmed status"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"Masterclad medium-voltage switchgear: circuit-breaker section interlocks","url":"https://productinfo.se.com/masterclad_mv_switchgear_ib/6055-30-masterclad-15kv-mv-switchgear-ib/English/6055-30%20Masterclad%20MV%20Switchgear%20Indoor%20%28bookmap%29_DD00646805.xml/%24/Section6-CircuitBreakerSectionInter-58DD6EC7"}],"profileId":"power-installation-testing"},"url":"https://eloragrid.ai/symbols/test-output-blocking-confirmation","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/test-output-blocking-confirmation.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pi26-masterclad","publisher":"Schneider Electric","title":"Masterclad medium-voltage switchgear: circuit-breaker section interlocks","url":"https://productinfo.se.com/masterclad_mv_switchgear_ib/6055-30-masterclad-15kv-mv-switchgear-ib/English/6055-30%20Masterclad%20MV%20Switchgear%20Indoor%20%28bookmap%29_DD00646805.xml/%24/Section6-CircuitBreakerSectionInter-58DD6EC7","scope":"Breaker control, mechanism, position contacts, racking interlocks and test interfaces.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"Public technical context for switchgear test and commissioning interfaces. Breaker control, mechanism, position contacts, racking interlocks and test interfaces. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}