{"schemaVersion":1,"slug":"single-incomer-sectionalised-switchboard","name":"Single-incomer sectionalised switchboard","kind":"symbol","abbreviation":"SSS","aliases":["Switchboard source and bus interfaces","switchgear Switchboard source and bus interfaces","switchgear","Switchgear","One incomer","Sectioned bus supply"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Shows one incoming source feeding separately identified bus sections through a section connection.","description":["Shows one incoming source feeding separately identified bus sections through a section connection. A source and bus arrangement shows how incoming supplies and outgoing circuits can be connected. Breaker and tie positions determine which sections are energized and whether sources can become electrically paralleled.","In a switchgear lineup with two incomers and a bus tie, the single-line arrangement helps the engineer identify normal supply paths and which loads change source during a transfer. For this reference, the drawing identifies “One incomer” at the input and “Sectioned bus supply” at the output. Sectioning alone does not provide source redundancy.","Keep normal positions, transfer limits, source independence and protection-zone boundaries visible. An arrangement drawing explains connectivity; the permitted switching sequence needs a separate approved scheme. 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: One incomer. Identify its source device or document and the state represented on the drawing.","Follow the named output: Sectioned bus supply. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Sectioning alone does not provide source redundancy.","Keep normal positions, transfer limits, source independence and protection-zone boundaries visible. An arrangement drawing explains connectivity; the permitted switching sequence needs a separate approved scheme."],"drawingChecklist":["Label the source and connection reference for one incomer.","Identify the destination and defined state of sectioned bus supply.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Sectioning alone does not provide source redundancy."],"distinction":"Sectioning alone does not provide source redundancy. 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":"One incomer"},{"label":"Output / connection","value":"Sectioned bus supply"},{"label":"Lookup label","value":"SSS is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-bus-schemes","relevance":"Public technical context for switchboard source and bus interfaces. Bus arrangements, breaker control and bay-level coordination. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["busbar","automatic-transfer-switch","dual-incomer-normally-open-bus-tie"],"artwork":"pi26-single-incomer-sectionalised-switchboard","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"switchgear","family":"supply-arrangements","input":"One incomer","output":"Sectioned bus supply"},"plainEnglish":{"title":"What this block does","introduction":"Shows one incoming source feeding separately identified bus sections through a section connection.","example":"In a switchgear lineup with two incomers and a bus tie, the single-line arrangement helps the engineer identify normal supply paths and which loads change source during a transfer. For this reference, the drawing identifies “One incomer” at the input and “Sectioned bus supply” at the output. Sectioning alone does not provide source redundancy.","drawings":"Start at the named input: One incomer. Identify its source device or document and the state represented on the drawing. Follow the named output: Sectioned bus supply. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"One incomer"},{"name":"Output","meaning":"Sectioned bus supply"},{"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":["One incomer","SSS","Sectioned bus supply"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"SEL-451 protection, automation and bay control","url":"https://selinc.com/products/451/"}],"profileId":"power-installation-supply-arrangements"},"url":"https://eloragrid.ai/symbols/single-incomer-sectionalised-switchboard","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/single-incomer-sectionalised-switchboard.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pi26-bus-schemes","publisher":"SEL","title":"SEL-451 protection, automation and bay control","url":"https://selinc.com/products/451/","scope":"Bus arrangements, breaker control and bay-level coordination.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"Public technical context for switchboard source and bus interfaces. Bus arrangements, breaker control and bay-level coordination. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}