{"schemaVersion":1,"slug":"mesh-corner-circuit-arrangement","name":"Mesh-corner circuit arrangement","kind":"symbol","abbreviation":"MCA","aliases":["Switchyard busbar arrangements","switchyards Switchyard busbar arrangements","switchyards","Switchyards","Mesh switching nodes","Mesh-corner circuit paths"],"category":"power-distribution","drawingTypes":["SLD","Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Shows the assigned circuit connections around a documented mesh corner.","description":["Shows the assigned circuit connections around a documented mesh corner. A busbar arrangement defines the available paths between incoming circuits, outgoing circuits and bus sections. Its switching devices and measurement boundaries determine how a circuit can remain connected when part of the installation is unavailable.","In a switchyard, a single-line arrangement helps identify the bay connections, tie devices and possible alternate supply paths. Normal open points must remain separate from the equipment's physical ability to close. For this reference, the drawing identifies “Mesh switching nodes” at the input and “Mesh-corner circuit paths” at the output. Protection and availability depend on the mesh design.","Name each bus, bay and switching device. The arrangement illustrates electrical connectivity; reliability, fault levels, permitted switching and protection coordination require the actual network design. The circuit arrangement 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: Mesh switching nodes. Identify its source device or document and the state represented on the drawing.","Follow the named output: Mesh-corner circuit paths. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Protection and availability depend on the mesh design.","Name each bus, bay and switching device. The arrangement illustrates electrical connectivity; reliability, fault levels, permitted switching and protection coordination require the actual network design."],"drawingChecklist":["Label the source and connection reference for mesh switching nodes.","Identify the destination and defined state of mesh-corner circuit paths.","Record the equipment or control-document revision supporting this circuit arrangement.","Check this application limit in the project design: Protection and availability depend on the mesh design."],"distinction":"Protection and availability depend on the mesh 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":"Circuit arrangement"},{"label":"Installation focus","value":"Switchyards"},{"label":"Input / boundary","value":"Mesh switching nodes"},{"label":"Output / connection","value":"Mesh-corner circuit paths"},{"label":"Lookup label","value":"MCA is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-bus-schemes","relevance":"Public technical context for switchyard busbar arrangements. 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","disconnector","single-breaker-bus-coupler-arrangement"],"artwork":"pi26-mesh-corner-circuit-arrangement","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"circuit-arrangement","focus":"switchyards","family":"yard-buses","input":"Mesh switching nodes","output":"Mesh-corner circuit paths"},"plainEnglish":{"title":"What this arrangement shows","introduction":"Shows the assigned circuit connections around a documented mesh corner.","example":"In a switchyard, a single-line arrangement helps identify the bay connections, tie devices and possible alternate supply paths. Normal open points must remain separate from the equipment's physical ability to close. For this reference, the drawing identifies “Mesh switching nodes” at the input and “Mesh-corner circuit paths” at the output. Protection and availability depend on the mesh design.","drawings":"Start at the named input: Mesh switching nodes. Identify its source device or document and the state represented on the drawing. Follow the named output: Mesh-corner circuit paths. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Mesh switching nodes"},{"name":"Output","meaning":"Mesh-corner circuit paths"},{"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":["Mesh switching nodes","MCA","Mesh-corner circuit paths"],"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-yard-buses"},"url":"https://eloragrid.ai/symbols/mesh-corner-circuit-arrangement","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/mesh-corner-circuit-arrangement.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 switchyard busbar arrangements. Bus arrangements, breaker control and bay-level coordination. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}