{"schemaVersion":1,"slug":"secondary-injection-current-input-boundary","name":"Secondary-injection current input boundary","kind":"symbol","abbreviation":"SCIB","aliases":["Switchgear test and commissioning interfaces","switchgear Switchgear test and commissioning interfaces","switchgear","Switchgear","Injection current source","Relay current input"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Identifies where a test source applies current to the assigned measuring input circuit.","description":["Identifies where a test source applies current to the assigned measuring input circuit. 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 “Injection current source” at the input and “Relay current input” at the output. The live CT connection needs a separate defined arrangement.","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: Injection current source. Identify its source device or document and the state represented on the drawing.","Follow the named output: Relay current input. Cross-reference its destination and separate the command from confirmation that the equipment responded.","The live CT connection needs a separate defined arrangement.","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 injection current source.","Identify the destination and defined state of relay current input.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: The live CT connection needs a separate defined arrangement."],"distinction":"The live CT connection needs a separate defined arrangement. 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":"Injection current source"},{"label":"Output / connection","value":"Relay current input"},{"label":"Lookup label","value":"SCIB 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","secondary-injection-voltage-input-boundary"],"artwork":"pi26-secondary-injection-current-input-boundary","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"switchgear","family":"testing","input":"Injection current source","output":"Relay current input"},"plainEnglish":{"title":"What this block does","introduction":"Identifies where a test source applies current to the assigned measuring input circuit.","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 “Injection current source” at the input and “Relay current input” at the output. The live CT connection needs a separate defined arrangement.","drawings":"Start at the named input: Injection current source. Identify its source device or document and the state represented on the drawing. Follow the named output: Relay current input. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Injection current source"},{"name":"Output","meaning":"Relay current input"},{"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":["Injection current source","SCIB","Relay current input"],"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/secondary-injection-current-input-boundary","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/secondary-injection-current-input-boundary.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."}]}