Quick answer: Select a joint from both cable ends. Confirm that the two cables have compatible voltage class, conductor, insulation dimensions, screen/armour construction and bonding requirements before choosing a kit.
Information required before selection
A joint connects two complete cable systems, so data is required for Cable A and Cable B.
- U0/U (Um) and cable standard for both sides
- Conductor material, class, size and diameter for both sides
- Insulation diameter over conductor and over insulation
- Metallic screen type and cross-section
- Armour and outer-sheath construction
- Direct-buried, tray, tunnel, duct or submerged environment
- Bonding, link-box and sheath-voltage requirements
Technical selection framework
| Review area | What the buyer should confirm | Why it changes the supply |
|---|---|---|
| Conductor connector | Confirm material combination, size range and installation method. | Cu-Cu, Al-Al and transition connections require different review. |
| Electrical interface | Match insulation diameter and stress-control range on both cables. | Equal cross-section does not guarantee equal insulation dimensions. |
| Screen continuity | Rebuild the metallic screen with adequate current capability. | Screen treatment affects fault-current path and induced voltages. |
| Armour/sheath | Restore mechanical protection and environmental sealing. | Direct burial and wet environments demand careful outer protection. |
| Bonding arrangement | Confirm single-point, both-end or cross-bonded system requirements. | Incorrect bonding can create sheath voltages or circulating currents. |
Recommended review sequence
- Collect both cable datasheets.
- Compare every construction layer.
- Define conductor and screen connection.
- Select stress-control and outer-seal system.
- Approve installation method, inspection and test plan.
Common RFQ mistakes
- Assuming both 240mm² cables have identical dimensions.
- Omitting screen-wire cross-section and fault duty.
- Ignoring aluminium-to-copper transition requirements.
- Ordering a standard straight joint for a special bonding system.
What a quotation package should contain
The joint submission should include compatibility range for both cables, connector, stress-control components, screen/armour continuity, outer protection, installation dimensions, instructions and type-test references.
Need equipment matched to your project?
Project-based example
When an existing cable is joined to a replacement cable from another manufacturer, a dimensional comparison sheet is often more important than the trade name. This should be completed before the outage or installation window.
Standards note: IEC 60502-4 may apply within its voltage scope. Special bonding, transition or repair joints need project-specific engineering beyond a standard kit code.
