{"schemaVersion":1,"slug":"switchroom-heater-auxiliary-feeder","name":"Switchroom heater auxiliary feeder","kind":"symbol","abbreviation":"SHAF","aliases":["Switchroom auxiliary AC distribution","switchrooms Switchroom auxiliary AC distribution","switchrooms","Switchrooms","Heater supply branch","Conditioning heater input"],"category":"installation-communications","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Shows the assigned supply circuit for room or enclosure conditioning heaters.","description":["Shows the assigned supply circuit for room or enclosure conditioning heaters. 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 “Heater supply branch” at the input and “Conditioning heater input” at the output. Heater availability does not establish humidity control.","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: Heater supply branch. Identify its source device or document and the state represented on the drawing.","Follow the named output: Conditioning heater input. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Heater availability does not establish humidity control.","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 heater supply branch.","Identify the destination and defined state of conditioning heater input.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Heater availability does not establish humidity control."],"distinction":"Heater availability does not establish humidity control. 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":"Heater supply branch"},{"label":"Output / connection","value":"Conditioning heater input"},{"label":"Lookup label","value":"SHAF 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-service-socket-residual-current-interface"],"artwork":"pi26-switchroom-heater-auxiliary-feeder","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"switchrooms","family":"room-ac","input":"Heater supply branch","output":"Conditioning heater input"},"plainEnglish":{"title":"What this block does","introduction":"Shows the assigned supply circuit for room or enclosure conditioning heaters.","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 “Heater supply branch” at the input and “Conditioning heater input” at the output. Heater availability does not establish humidity control.","drawings":"Start at the named input: Heater supply branch. Identify its source device or document and the state represented on the drawing. Follow the named output: Conditioning heater input. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Heater supply branch"},{"name":"Output","meaning":"Conditioning heater 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":["Heater supply branch","SHAF","Conditioning heater input"],"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/switchroom-heater-auxiliary-feeder","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/switchroom-heater-auxiliary-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."}]}