HT0_TW
Twisted-pair indication
A twisted-pair indication identifies the documented association of two conductors as a twisted pair.
IEC
IEEE / ANSI · TW
ANSI/IEEE twisted pair symbol
IEEE-oriented representation of two conductors twisted together, used to identify noise-rejecting signal pairs.
In plain English
What does ANSI/IEEE twisted pair mean?
IEEE-style schematics show a twisted pair with the two conductor lines crossing repeatedly over a short length. It identifies conductors that must be kept as a pair in one cable, such as differential signal lines, current transformer secondary pairs run in instrument cables, or communication buses.
A simple example
The illustration here explains the convention and is not the IEEE graphic. The twist mark does not imply a shield. When a pair is also shielded the drawing should add the shield enclosure; when it is part of a multipair cable, the pair number should be given.
What the drawings help you do
Keep both conductors of the pair on the same circuit. Look for a separate shield mark if a shield exists. A twisted pair is twisted only; a shielded conductor has a screen and may not be twisted.
This particular reference
IEEE-oriented representation of two conductors twisted together, used to identify noise-rejecting signal pairs. A twisted pair is twisted only; a shielded conductor has a screen and may not be twisted.
- Winding
- A coil of conductor inside an electrical machine or transformer.
- Signal
- Electrical information passed between devices, rather than necessarily the main power supply.
- Rating
- A value stating the conditions for which equipment is specified.
Read the source: IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams · Autodesk IEC-60617 preview: Cable identification and twisted-pair annotation
IEEE / ANSI · Twisted pair crossing form
Independent illustration in IEEE drafting context; no equivalence of every detailed standard graphic is asserted.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
Schematic · TW
What it represents
IEEE-style schematics show a twisted pair with the two conductor lines crossing repeatedly over a short length. It identifies conductors that must be kept as a pair in one cable, such as differential signal lines, current transformer secondary pairs run in instrument cables, or communication buses.
The illustration here explains the convention and is not the IEEE graphic. The twist mark does not imply a shield. When a pair is also shielded the drawing should add the shield enclosure; when it is part of a multipair cable, the pair number should be given.
How to read it
- Keep both conductors of the pair on the same circuit.
- Look for a separate shield mark if a shield exists.
Information to show or reference
- Identify pair number within the cable.
- Add a shield mark only if shielded.
- Route pair conductors together on wiring diagrams.
A distinction that matters
A twisted pair is twisted only; a shielded conductor has a screen and may not be twisted.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams
Graphic-symbol standards context and official status; not a source of reproduced artwork.
Autodesk IEC-60617 preview: Cable identification and twisted-pair annotation
Public publisher family listing a twisted-pair marker in the companion IEC library.
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.