{"schemaVersion":1,"slug":"iec-three-phase-motor-with-four-connections","name":"Three-phase motor with four connections","kind":"symbol","abbreviation":"HMO14","aliases":["Three-phase motor with four connections symbol","HMO14","Three-phase motor with four connections IEC reference"],"category":"power-distribution","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEC","Manufacturer"],"summary":"This representation distinguishes the publisher's three-phase motor form with four indicated connections.","description":["This representation distinguishes the publisher's three-phase motor form with four indicated connections.","Verify the purpose of the fourth connection against the selected motor terminal diagram.","Do not assume the additional connection is a protective-earth terminal without the equipment documentation."],"readingNotes":["Verify the purpose of the fourth connection against the selected motor terminal diagram.","Do not assume the additional connection is a protective-earth terminal without the equipment documentation."],"drawingChecklist":["Identify the associated device, circuit or diagram boundary.","Verify the purpose of the fourth connection against the selected motor terminal diagram.","Cross-reference the equipment data, terminal mapping or operating-state legend needed to interpret the form."],"distinction":"Do not assume the additional connection is a protective-earth terminal without the equipment documentation.","facts":[{"label":"Reference scope","value":"Specific public IEC-context family form"},{"label":"Publisher reference token","value":"HMO14 (Autodesk token; not a verified IEC database ID)"},{"label":"Information added","value":"Verify the purpose of the fourth connection against the selected motor terminal diagram."},{"label":"Preview","value":"Independent educational concept; consult the publisher and applicable standard for the exact graphic"}],"references":[{"sourceId":"autodesk-motors","relevance":"Official public publisher family name and reference context; vendor identifiers and graphics are distinct from licensed IEC database content."}],"related":["motor","generator"],"artwork":"edu-iec-three-phase-motor-with-four-connections","publishedOn":"2026-10-14","updatedOn":"2026-10-14","provenance":"independent-public-research","symbolVariant":{"convention":"IEC","form":"Three-phase motor with four connections","reference":"Autodesk IEC-60617 Symbol Preview — Three-phase motor forms; vendor family reference, not certified IEC geometry or database identifier."},"url":"https://eloragrid.ai/symbols/iec-three-phase-motor-with-four-connections","illustration":{"url":"https://eloragrid.ai/library/illustrations/iec-three-phase-motor-with-four-connections.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"autodesk-motors","title":"Three-phase motor symbol variants","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-385CBE83-33A3-4314-913E-3B59A6D05F22.htm","type":"cad-reference","scope":"Motor variants including asynchronous, synchronous and connection-count differences.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Official public publisher family name and reference context; vendor identifiers and graphics are distinct from licensed IEC database content."}]}