J
Cable straight-through joint
A joint connecting two lengths of the same cable in line, drawn as a mark on the cable route.
IEC
IEC · CB
Cable screen cross-bonding
Screens of three single-core cables transposed at joints so that induced sheath voltages cancel over a major section.
In plain English
What does Cable screen cross-bonding mean?
On long high voltage single-core circuits, the cable screens are cut at joints and reconnected in rotation so that each screen runs alongside each phase for one third of the section. This cancels most of the induced sheath voltage and circulating current. Bonding diagrams show the screen connections crossing at each joint, with link boxes and sheath voltage limiters.
A simple example
The symbol shows the circuit arrangement, not the link box arrangement or sheath voltage limiter rating. Errors in cross-bonding connections cause large circulating currents and overheating, so phase-to-screen allocation at each joint should be read carefully against the cable drawings.
What the drawings help you do
Check screen rotation order at each joint. Locate link boxes and sheath voltage limiters. Cross-bonding transposes screens between phases; conductor interchange transposes the phase conductors themselves.
This particular reference
Screens of three single-core cables transposed at joints so that induced sheath voltages cancel over a major section. Cross-bonding transposes screens between phases; conductor interchange transposes the phase conductors themselves.
- Phase
- One of the related AC waveforms in a power system.
- Terminal
- An identified point where a conductor connects.
- Rating
- A value stating the conditions for which equipment is specified.
Read the source: Elastimold underground cable accessories · IEC-60617 symbol preview directory
IEC · Cross-bonded cable screen arrangement
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 · CB
What it represents
On long high voltage single-core circuits, the cable screens are cut at joints and reconnected in rotation so that each screen runs alongside each phase for one third of the section. This cancels most of the induced sheath voltage and circulating current. Bonding diagrams show the screen connections crossing at each joint, with link boxes and sheath voltage limiters.
The symbol shows the topology, not the link box arrangement or sheath voltage limiter rating. Errors in cross-bonding connections cause large circulating currents and overheating, so phase-to-screen allocation at each joint should be read carefully against the cable drawings.
How to read it
- Check screen rotation order at each joint.
- Locate link boxes and sheath voltage limiters.
Information to show or reference
- Show screen rotation at each joint.
- Identify link boxes.
- Show solid bonding at section ends.
A distinction that matters
Cross-bonding transposes screens between phases; conductor interchange transposes the phase conductors themselves.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Elastimold underground cable accessories
Manufacturer context for cable joints and accessories.
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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