{"schemaVersion":1,"slug":"ansi-phase-to-phase-voltmeter-selector","name":"ANSI/IEEE Phase-to-phase voltmeter selector form","kind":"symbol","abbreviation":"HSW1S90","aliases":["HSW1S90","VSW1S90","IEEE 3 Voltage Phase Switch","ANSI Phase-to-phase voltmeter selector"],"category":"measurement-protection","drawingTypes":["Schematic"],"referenceFamilies":["IEEE / ANSI","Manufacturer"],"summary":"IEEE-library form of phase-to-phase voltmeter selector: this representation identifies selection among phase-to-phase voltage measurement connections.","description":["This reference locates phase-to-phase voltmeter selector in Autodesk's IEEE-oriented miscellaneous switches family. This representation identifies selection among phase-to-phase voltage measurement connections. The selector connects the meter to the documented line-to-line measurement pairs at its operating positions. It is a measurement interface, not the power switching device of the three-phase circuit. The public library uses HSW1S90 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.","Read the operating mechanism and the contact reference state together. Cross-reference every associated contact to the same device and show which movement, signal or reset changes its condition; the symbol alone does not establish the complete switching sequence.","Provide the actual contact programme and measurement position labels. Identify any instrument-transformer secondary circuits that feed the selector. Document the selector position table and the meter connection. A measurement selector must not be mistaken for a three-phase power isolator. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted."],"readingNotes":["Document the selector position table and the meter connection.","A measurement selector must not be mistaken for a three-phase power isolator."],"drawingChecklist":["Identify the associated device, circuit or diagram boundary.","Document the selector position table and the meter connection.","Cross-reference the equipment data, terminal mapping or operating-state legend needed to interpret the form."],"distinction":"A measurement selector must not be mistaken for a three-phase power isolator.","facts":[{"label":"Convention evidence","value":"Autodesk IEEE Symbol Preview: Miscellaneous Switches; published form: 3 Voltage Phase Switch."},{"label":"Public vendor block","value":"HSW1S90. Vendor library token, not an IEEE symbol number."},{"label":"Information added","value":"Document the selector position table and the meter connection."},{"label":"Preview","value":"Independent educational concept; consult the publisher and applicable standard for the exact graphic"},{"label":"Artwork scope","value":"Original educational geometry. Exact standard graphics, product ratings and terminal pinouts are not certified."}],"references":[{"sourceId":"ansi-autodesk-278f6c21-b1a6-4ea1-a535-e78d53bbd10d","relevance":"Public IEEE-oriented Miscellaneous Switches table explicitly lists HSW1S90 as 3 Voltage Phase Switch. This supports the vendor convention context, not reproduction of the publisher graphic."}],"related":["iec-phase-to-phase-voltmeter-selector","current-transformer","voltage-transformer"],"artwork":"s28-ansi-phase-to-phase-voltmeter-selector","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEEE / ANSI","form":"3 Voltage Phase Switch","reference":"Autodesk IEEE Symbol Preview: Miscellaneous Switches, block HSW1S90. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier.","counterpart":"iec-phase-to-phase-voltmeter-selector"},"plainEnglish":{"title":"What does ANSI/IEEE Phase-to-phase voltmeter selector form mean?","introduction":"This reference locates phase-to-phase voltmeter selector in Autodesk's IEEE-oriented miscellaneous switches family. This representation identifies selection among phase-to-phase voltage measurement connections. The selector connects the meter to the documented line-to-line measurement pairs at its operating positions. It is a measurement interface, not the power switching device of the three-phase circuit. The public library uses HSW1S90 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.","example":"Read the operating mechanism and the contact reference state together. Cross-reference every associated contact to the same device and show which movement, signal or reset changes its condition; the symbol alone does not establish the complete switching sequence.","drawings":"Provide the actual contact programme and measurement position labels. Identify any instrument-transformer secondary circuits that feed the selector. Document the selector position table and the meter connection. A measurement selector must not be mistaken for a three-phase power isolator. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted.","terms":[{"name":"Winding","meaning":"A coil of conductor inside an electrical machine or transformer."},{"name":"Normally open / normally closed","meaning":"The contact state in the normal condition defined for the drawing."},{"name":"Phase","meaning":"One of the related AC waveforms in a power system."}],"diagram":"flow","steps":["Identify the device and form","Read the connections and state","Check the equipment reference"],"caption":"A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.","sources":[{"label":"Autodesk IEEE Symbol Preview — Miscellaneous Switches","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-278F6C21-B1A6-4EA1-A535-E78D53BBD10D.htm"}],"detail":"IEEE-library form of phase-to-phase voltmeter selector: this representation identifies selection among phase-to-phase voltage measurement connections. A measurement selector must not be mistaken for a three-phase power isolator.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/ansi-phase-to-phase-voltmeter-selector","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/ansi-phase-to-phase-voltmeter-selector.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"ansi-autodesk-278f6c21-b1a6-4ea1-a535-e78d53bbd10d","title":"Autodesk IEEE Symbol Preview — Miscellaneous Switches","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-278F6C21-B1A6-4EA1-A535-E78D53BBD10D.htm","type":"cad-reference","scope":"Verified public IEEE-oriented vendor catalogue. Block names identify vendor symbols, not IEEE standard symbol numbers. Linked only; graphics and CAD files are not redistributed. IEEE/ANSI 315-1975 is a historical graphics reference with Inactive-Reserved status; this page does not certify current standards compliance.","checkedOn":"2026-10-14","reuse":"link-only","relevance":"Public IEEE-oriented Miscellaneous Switches table explicitly lists HSW1S90 as 3 Voltage Phase Switch. This supports the vendor convention context, not reproduction of the publisher graphic."}]}