CROSSING
Unconnected conductor crossing
An unconnected crossing shows conductors passing across each other in the drawing without an electrical junction.
Schematic
IEC · X
Interchange of conductors
A crossing mark showing that two or more conductors swap position, such as a phase transposition or deliberate phase swap.
In plain English
What does Interchange of conductors mean?
The interchange form shows conductors crossing over so that their positions change along the run. On transmission lines it represents transposition, used to balance phase impedances. On motor and generator circuits it may show a deliberate swap of two phases to reverse rotation or to correct phase sequence.
A simple example
The symbol must be read with the phase labels on both sides, because the purpose differs. An unlabelled crossing may be mistaken for a drafting artefact. Where the interchange changes phase sequence, any synchronising or phase-sequence-sensitive equipment downstream must be checked.
What the drawings help you do
Read phase labels either side of the interchange. Check whether rotation or phase sequence downstream depends on it. Interchanged conductors change position or phase; an unconnected crossing just passes over another conductor with no change.
This particular reference
A crossing mark showing that two or more conductors swap position, such as a phase transposition or deliberate phase swap. Interchanged conductors change position or phase; an unconnected crossing just passes over another conductor with no change.
- Phase
- One of the related AC waveforms in a power system.
- Schematic
- A drawing showing function and connections rather than physical appearance.
Read the source: Wire connection dots, crossing gaps and loops · IEC-60617 symbol preview directory
IEC · Conductor interchange form
Independent IEC-context illustration; not certified IEC geometry.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
SLD / Schematic · X
What it represents
The interchange form shows conductors crossing over so that their positions change along the run. On transmission lines it represents transposition, used to balance phase impedances. On motor and generator circuits it may show a deliberate swap of two phases to reverse rotation or to correct phase sequence.
The symbol must be read with the phase labels on both sides, because the purpose differs. An unlabelled crossing may be mistaken for a drafting artefact. Where the interchange changes phase sequence, any synchronising or phase-sequence-sensitive equipment downstream must be checked.
How to read it
- Read phase labels either side of the interchange.
- Check whether rotation or phase sequence downstream depends on it.
Information to show or reference
- Label phases on both sides of the interchange.
- State the reason for the swap where it changes rotation.
- Check synchronising and metering connections downstream.
A distinction that matters
Interchanged conductors change position or phase; an unconnected crossing just passes over another conductor with no change.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Wire connection dots, crossing gaps and loops
Public guidance on wire crossings and connection display in drawings.
IEC-60617 symbol preview directory
Public directory of IEC-oriented symbol families.
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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