CT
Current transformer
A current-measurement transformer used with metering and protection equipment.
SLD / Schematic
IEC · HSW1S93
Two-network voltage measurement selector
This representation distinguishes voltage selection between two three-phase networks.
IEC · Two-network voltage measurement 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 · HSW1S93
What it represents
This representation distinguishes voltage selection between two three-phase networks. The measurement is selected from more than one network or bus system. Both source identities must remain visible so that a reading is not attributed to the wrong supply.
Tag the two measurement sources and provide a position table with each voltage pair. This selector does not create a load-supply transfer arrangement between the networks.
How to read it
- Identify both sources and each selectable measurement connection.
- Measurement selection between networks is not an automatic source-transfer power switch.
Information to show or reference
- Identify the associated device, circuit or diagram boundary.
- Identify both sources and each selectable measurement connection.
- Cross-reference the equipment data, terminal mapping or operating-state legend needed to interpret the form.
A distinction that matters
Measurement selection between networks is not an automatic source-transfer power switch.
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.
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