{"schemaVersion":1,"slug":"portable-test-supply-connection-boundary","name":"Portable test-supply connection boundary","kind":"symbol","abbreviation":"PTCB","aliases":["Switchgear test and commissioning interfaces","switchgear Switchgear test and commissioning interfaces","switchgear","Switchgear","Temporary test supply","Defined test circuit feed"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Shows the assigned connection point for a separately controlled temporary test supply.","description":["Shows the assigned connection point for a separately controlled temporary test supply. 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 “Temporary test supply” at the input and “Defined test circuit feed” at the output. Backfeed prevention belongs to the test design.","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: Temporary test supply. Identify its source device or document and the state represented on the drawing.","Follow the named output: Defined test circuit feed. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Backfeed prevention belongs to the test design.","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 temporary test supply.","Identify the destination and defined state of defined test circuit feed.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Backfeed prevention belongs to the test design."],"distinction":"Backfeed prevention belongs to the test design. 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":"Temporary test supply"},{"label":"Output / connection","value":"Defined test circuit feed"},{"label":"Lookup label","value":"PTCB 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","test-record-event-marker-input"],"artwork":"pi26-portable-test-supply-connection-boundary","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"switchgear","family":"testing","input":"Temporary test supply","output":"Defined test circuit feed"},"plainEnglish":{"title":"What this block does","introduction":"Shows the assigned connection point for a separately controlled temporary test supply.","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 “Temporary test supply” at the input and “Defined test circuit feed” at the output. Backfeed prevention belongs to the test design.","drawings":"Start at the named input: Temporary test supply. Identify its source device or document and the state represented on the drawing. Follow the named output: Defined test circuit feed. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Temporary test supply"},{"name":"Output","meaning":"Defined test circuit feed"},{"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":["Temporary test supply","PTCB","Defined test circuit feed"],"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/portable-test-supply-connection-boundary","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/portable-test-supply-connection-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."}]}