{"schemaVersion":1,"slug":"station-service-transformer-incoming-branch","name":"Station-service transformer incoming branch","kind":"symbol","abbreviation":"STIB","aliases":["Switchroom auxiliary AC distribution","switchrooms Switchroom auxiliary AC distribution","switchrooms","Switchrooms","Station-service transformer","Auxiliary board incoming circuit"],"category":"installation-communications","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Shows the auxiliary board connection supplied by the station-service transformer.","description":["Shows the auxiliary board connection supplied by the station-service transformer. An auxiliary AC distribution diagram identifies the supplies serving room services and control-support equipment. Essential, backed-up and ordinary circuits can have different source paths and operating priorities.","In a switchroom, the lighting, service sockets, charger input and room cooling may be fed from different auxiliary branches. A source change must preserve the identities of loads that require continuity. For this reference, the drawing identifies “Station-service transformer” at the input and “Auxiliary board incoming circuit” at the output. Primary and secondary protection are separately designed.","Label source, branch protection and load purpose. The arrangement does not establish conductor sizes, protection settings or installation compliance; it links the operating role to the selected equipment schedule. 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: Station-service transformer. Identify its source device or document and the state represented on the drawing.","Follow the named output: Auxiliary board incoming circuit. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Primary and secondary protection are separately designed.","Label source, branch protection and load purpose. The arrangement does not establish conductor sizes, protection settings or installation compliance; it links the operating role to the selected equipment schedule."],"drawingChecklist":["Label the source and connection reference for station-service transformer.","Identify the destination and defined state of auxiliary board incoming circuit.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Primary and secondary protection are separately designed."],"distinction":"Primary and secondary protection are separately designed. 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":"Switchrooms"},{"label":"Input / boundary","value":"Station-service transformer"},{"label":"Output / connection","value":"Auxiliary board incoming circuit"},{"label":"Lookup label","value":"STIB is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-station-power","relevance":"Public technical context for switchroom auxiliary ac distribution. Independent AC and DC sources for station auxiliary power. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["ga-panel-service-outlet","ac-uninterruptible-power-supply","standby-generator-auxiliary-service-branch"],"artwork":"pi26-station-service-transformer-incoming-branch","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"switchrooms","family":"room-ac","input":"Station-service transformer","output":"Auxiliary board incoming circuit"},"plainEnglish":{"title":"What this block does","introduction":"Shows the auxiliary board connection supplied by the station-service transformer.","example":"In a switchroom, the lighting, service sockets, charger input and room cooling may be fed from different auxiliary branches. A source change must preserve the identities of loads that require continuity. For this reference, the drawing identifies “Station-service transformer” at the input and “Auxiliary board incoming circuit” at the output. Primary and secondary protection are separately designed.","drawings":"Start at the named input: Station-service transformer. Identify its source device or document and the state represented on the drawing. Follow the named output: Auxiliary board incoming circuit. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Station-service transformer"},{"name":"Output","meaning":"Auxiliary board incoming circuit"},{"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":["Station-service transformer","STIB","Auxiliary board incoming circuit"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"SEL-RPM redundant power module","url":"https://selinc.com/products/RPM/"}],"profileId":"power-installation-room-ac"},"url":"https://eloragrid.ai/symbols/station-service-transformer-incoming-branch","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/station-service-transformer-incoming-branch.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pi26-station-power","publisher":"SEL","title":"SEL-RPM redundant power module","url":"https://selinc.com/products/RPM/","scope":"Independent AC and DC sources for station auxiliary power.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"Public technical context for switchroom auxiliary ac distribution. Independent AC and DC sources for station auxiliary power. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}