# ANSI/IEEE Three-phase motor with four connections form Canonical URL: https://eloragrid.ai/symbols/ansi-three-phase-motor-with-four-connections Publisher: Elora Grid Updated: 2026-10-28 Lookup label: HMO14 Drawing use: SLD, Schematic Reference families: IEEE / ANSI, Manufacturer ## Symbol convention Convention: IEEE / ANSI Form: 3 Phase Motor (4 Connections) Autodesk IEEE Symbol Preview: 3 Phase Motors, block HMO14. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier. Related representation: [Three-phase motor with four connections](https://eloragrid.ai/symbols/iec-three-phase-motor-with-four-connections) IEEE-library form of three-phase motor with four connections: this representation distinguishes the publisher's three-phase motor form with four indicated connections. ## In plain English ### What does ANSI/IEEE Three-phase motor with four connections form mean? This reference locates three-phase motor with four connections in Autodesk's IEEE-oriented 3 phase motors family. This representation distinguishes the publisher's three-phase motor form with four indicated connections. The public library uses HMO14 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number. ### A simple example Trace each winding, supply and accessible neutral through the complete machine or transformer connection diagram. Keep the phase arrangement, terminal labels and any clock notation attached to the device; neither the convention label nor this educational outline supplies its ratings. ### What the drawings help you do 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. 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. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted. ### This particular reference IEEE-library form of three-phase motor with four connections: this representation distinguishes the publisher's three-phase motor form with four indicated connections. Do not assume the additional connection is a protective-earth terminal without the equipment documentation. ### Terms - Winding: A coil of conductor inside an electrical machine or transformer. - Phase: One of the related AC waveforms in a power system. - Terminal: An identified point where a conductor connects. Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram. - [Autodesk IEEE Symbol Preview — 3 Phase Motors](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-392101FD-A88C-4BAC-96CD-1C676094C262.htm) ## What it represents This reference locates three-phase motor with four connections in Autodesk's IEEE-oriented 3 phase motors family. This representation distinguishes the publisher's three-phase motor form with four indicated connections. The public library uses HMO14 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number. Trace each winding, supply and accessible neutral through the complete machine or transformer connection diagram. Keep the phase arrangement, terminal labels and any clock notation attached to the device; neither the convention label nor this educational outline supplies its ratings. 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. 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. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted. ## How to read it - 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. ## Information to show or reference - 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. ## Important distinction Do not assume the additional connection is a protective-earth terminal without the equipment documentation. ## Facts - Convention evidence: Autodesk IEEE Symbol Preview: 3 Phase Motors; published form: 3 Phase Motor (4 Connections). - Public vendor block: HMO14. Vendor library token, not an IEEE symbol number. - Information added: Verify the purpose of the fourth connection against the selected motor terminal diagram. - Preview: Independent educational concept; consult the publisher and applicable standard for the exact graphic - Artwork scope: Original educational geometry. Exact standard graphics, product ratings and terminal pinouts are not certified. ## Public references - [Autodesk IEEE Symbol Preview — 3 Phase Motors](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-392101FD-A88C-4BAC-96CD-1C676094C262.htm) — Autodesk. Public IEEE-oriented 3 Phase Motors table explicitly lists HMO14 as 3 Phase Motor (4 Connections). This supports the vendor convention context, not reproduction of the publisher graphic. ## Graphic scope Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.