# ANSI/IEEE Phase-to-phase voltmeter selector form Canonical URL: https://eloragrid.ai/symbols/ansi-phase-to-phase-voltmeter-selector Publisher: Elora Grid Updated: 2026-10-28 Lookup label: HSW1S90 Drawing use: Schematic Reference families: IEEE / ANSI, Manufacturer ## Symbol convention Convention: IEEE / ANSI Form: 3 Voltage Phase Switch 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. Related representation: [Phase-to-phase voltmeter selector](https://eloragrid.ai/symbols/iec-phase-to-phase-voltmeter-selector) IEEE-library form of phase-to-phase voltmeter selector: this representation identifies selection among phase-to-phase voltage measurement connections. ## In plain English ### What does ANSI/IEEE Phase-to-phase voltmeter selector form mean? 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. ### A simple 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. ### What the drawings help you do 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. ### This particular reference 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. ### Terms - Winding: A coil of conductor inside an electrical machine or transformer. - Normally open / normally closed: The contact state in the normal condition defined for the drawing. - Phase: One of the related AC waveforms in a power system. 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 — Miscellaneous Switches](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-278F6C21-B1A6-4EA1-A535-E78D53BBD10D.htm) ## What it represents 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. ## How to read it - Document the selector position table and the meter connection. - A measurement selector must not be mistaken for a three-phase power isolator. ## Information to show or reference - 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. ## Important distinction A measurement selector must not be mistaken for a three-phase power isolator. ## Facts - Convention evidence: Autodesk IEEE Symbol Preview: Miscellaneous Switches; published form: 3 Voltage Phase Switch. - Public vendor block: HSW1S90. Vendor library token, not an IEEE symbol number. - Information added: Document the selector position table and the meter connection. - 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 — Miscellaneous Switches](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-278F6C21-B1A6-4EA1-A535-E78D53BBD10D.htm) — Autodesk. 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. ## 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.