{"schemaVersion":1,"slug":"protection-panel-service-ac-feeder","name":"Protection-panel service AC feeder","kind":"symbol","abbreviation":"PSAF","aliases":["Switchroom auxiliary AC distribution","switchrooms Switchroom auxiliary AC distribution","switchrooms","Switchrooms","Auxiliary AC board","Panel service AC"],"category":"installation-communications","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Shows the auxiliary AC circuit allocated to protection-panel service functions.","description":["Shows the auxiliary AC circuit allocated to protection-panel service functions. 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 “Auxiliary AC board” at the input and “Panel service AC” at the output. Service power differs from protective-relay operating power.","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: Auxiliary AC board. Identify its source device or document and the state represented on the drawing.","Follow the named output: Panel service AC. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Service power differs from protective-relay operating power.","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 auxiliary ac board.","Identify the destination and defined state of panel service ac.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Service power differs from protective-relay operating power."],"distinction":"Service power differs from protective-relay operating power. 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":"Auxiliary AC board"},{"label":"Output / connection","value":"Panel service AC"},{"label":"Lookup label","value":"PSAF 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","switchroom-hvac-auxiliary-feeder"],"artwork":"pi26-protection-panel-service-ac-feeder","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"switchrooms","family":"room-ac","input":"Auxiliary AC board","output":"Panel service AC"},"plainEnglish":{"title":"What this block does","introduction":"Shows the auxiliary AC circuit allocated to protection-panel service functions.","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 “Auxiliary AC board” at the input and “Panel service AC” at the output. Service power differs from protective-relay operating power.","drawings":"Start at the named input: Auxiliary AC board. Identify its source device or document and the state represented on the drawing. Follow the named output: Panel service AC. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Auxiliary AC board"},{"name":"Output","meaning":"Panel service AC"},{"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":["Auxiliary AC board","PSAF","Panel service AC"],"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/protection-panel-service-ac-feeder","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/protection-panel-service-ac-feeder.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."}]}