JUNCTION
Conductor connection junction
A junction indication marks a documented electrical connection between conductor branches.
Schematic
IEC · -
T-connection without junction dot
A conductor meeting another at a right angle and stopping there, which IEC practice reads as a connection even without a dot.
In plain English
What does T-connection without junction dot mean?
In IEC drawing practice a conductor that runs into another and ends there forms a T-connection, and the connection is understood whether or not a dot is drawn. Many drafting standards still recommend the dot for clarity, but undotted tees are common on legacy and vendor drawings.
A simple example
The convention depends on the drawing family. On some ANSI-style drawings an undotted tee may be ambiguous, which is why a dot is preferred there. Readers should check the drawing legend. A T-connection only shows electrical continuity; it does not tell you where the physical joint is, which may be at a terminal some distance away.
What the drawings help you do
Check the legend to see whether undotted tees are used as connections. Find the physical terminal or joint that realises the tee. An undotted tee is a connection; a plain four-way crossing without a dot is normally read as no connection.
This particular reference
A conductor meeting another at a right angle and stopping there, which IEC practice reads as a connection even without a dot. An undotted tee is a connection; a plain four-way crossing without a dot is normally read as no connection.
- Terminal
- An identified point where a conductor connects.
- 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 · Undotted T-connection
Independent IEC-context illustration of a drafting convention; not certified IEC geometry.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
Schematic / SLD · -
What it represents
In IEC drawing practice a conductor that runs into another and ends there forms a T-connection, and the connection is understood whether or not a dot is drawn. Many drafting standards still recommend the dot for clarity, but undotted tees are common on legacy and vendor drawings.
The convention depends on the drawing family. On some ANSI-style drawings an undotted tee may be ambiguous, which is why a dot is preferred there. Readers should check the drawing legend. A T-connection only shows electrical continuity; it does not tell you where the physical joint is, which may be at a terminal some distance away.
How to read it
- Check the legend to see whether undotted tees are used as connections.
- Find the physical terminal or joint that realises the tee.
Information to show or reference
- Apply one tee convention consistently across the set.
- Prefer a dot where drawings may be read under other conventions.
- Avoid four-way crossings that rely on dots alone.
A distinction that matters
An undotted tee is a connection; a plain four-way crossing without a dot is normally read as no connection.
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 connection dots, crossing gaps and loops.
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.
Explore related references
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Double junction of conductors
Four conductors joined using two offset T-junctions rather than one crossing dot, to avoid confusion with a crossing.
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ANSI/IEEE conductor junction symbol
IEEE-oriented junction dot marking a connection between crossing or meeting conductors on an ANSI-style schematic.
IEEE / ANSI
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