CT
Current transformer
A current-measurement transformer used with metering and protection equipment.
SLD / Schematic
IEC · HSW1S91
Phase-to-neutral voltmeter selector
This representation identifies selection among phase-to-neutral voltage measurement connections.
IEC · Phase-to-neutral voltmeter selector
Autodesk IEC-60617 Symbol Preview — Measurement-selection and mechanically operated switch forms; vendor family reference, not certified IEC geometry or database identifier.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
Schematic · HSW1S91
What it represents
This representation identifies selection among phase-to-neutral voltage measurement connections. The meter is connected to the selected phase relative to the documented neutral or reference point. That connection differs from measuring between two phase conductors.
Show the reference terminal and each selectable measurement path. The position table should make clear which reading the operator receives at each position.
How to read it
- Show the neutral/reference connection and each selected phase in the position table.
- Phase-to-neutral and phase-to-phase measurements have different connection paths.
Information to show or reference
- Identify the associated device, circuit or diagram boundary.
- Show the neutral/reference connection and each selected phase in the position table.
- Cross-reference the equipment data, terminal mapping or operating-state legend needed to interpret the form.
A distinction that matters
Phase-to-neutral and phase-to-phase measurements have different connection paths.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
AutoCAD Electrical: Level, flow, keyed and measurement switches
Official public publisher family name and reference context; vendor identifiers and graphics are distinct from licensed IEC database content.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
Explore related references
Put the reference into a drawing workflow.
Elora Grid helps electrical teams work with drawings, specifications and equipment information. Explore the drafting workflow or join the early-access waitlist.