Substation Cable Termination Kits
Terminations and joints are where a cable run fails first. When you are comparing 11kV and 33kV cold shrink cable termination kits, the site restriction decides the answer before the price does, and this page sets out the inputs that change it.
The problem this page solves
A joint or a termination is the weakest point in a cable run. Water, partial discharge and mechanical strain all start there, and the work is usually done in a trench, a manhole or a switchgear room rather than in a workshop.
The selection question is rarely the voltage class on its own. It is whether a flame is allowed at the site, how long the cable can stay out of service, and what the position drawing actually specifies. Cold-shrink exists because a heat gun is not permitted in many of those places.
Two families cover the work: silicone cold-shrink accessories in the 0.6/1 kV to 26/35 kV range, listed to IEEE 386, and heat-shrink kits in the 0.6/1 kV to 26/35 kV range listed to IEC 60502. The two are not interchangeable in assembly method, and the prep on a heat-shrink MV kit is longer than the recovery.
- Flame restrictions : switchgear rooms, cable trenches, manholes, refineries and mines usually prohibit an open flame, which rules out heat-shrink regardless of price.
- Short outage windows : cold-shrink needs no heat and no cooling time, but the body grips where it is released, so position has to be right before the core is pulled.
- Partial discharge : a termination that is correctly sized but wrongly positioned concentrates stress at the screen cut-back and fails the discharge test.
- Documentation : utility and EPC projects ask for the type-test scope in writing before the kit is approved, and the answer differs between a component rating and a kit-level report.
Technical specification and cross-identification
Standards shown are the values published on the Wellele product page for each kit family. Cross-identification lists the nearest catalogue family from other suppliers, for identification only.
| Wellele Series-Type | Form | Voltage class | Size basis | Reference standards | Cross-identification |
|---|---|---|---|---|---|
| WLL-CS-SIL-1K | Cold-shrink termination and joint kit, silicone | 0.6/1 kV | Core count, per-core insulation OD | IEEE 386, -50 to +200 °C | Raychem/TE CSJH · 3M 5600 / QS-III · Deray Cold-Fit |
| WLL-CS-SIL-15K | Cold-shrink kit, silicone, spiral core | 8.7/15 kV | Per-core insulation OD, screen structure | IEEE 386, -50 to +200 °C | Raychem/TE CSJH · 3M 5600 / QS-III · Deray Cold-Fit |
| WLL-CS-SIL-12/20 | Cold-shrink kit, silicone | 12/20 kV | Cable construction per drawing | IEEE 386, -50 to +200 °C | Raychem/TE CSJH · 3M 5600 / QS-III |
| WLL-CS-SIL-18/20 | Cold-shrink kit, silicone | 18/20 kV | Cable construction per drawing | IEEE 386, -50 to +200 °C | Raychem/TE CSJH · 3M 5600 / QS-III |
| WLL-CS-SIL-35K | Cold-shrink kit, silicone, multi-layer | 26/35 kV | Per-core insulation OD, screen structure | IEEE 386, -50 to +200 °C | Raychem/TE CSJH · 3M 5600 / QS-III · Deray Cold-Fit |
| WLL-HSK-1K | Heat-shrink kit, polyolefin and silicone composite | 0.6/1 kV | Core count, connector range | IEC 60502, -50 to +125 °C | No published cross-reference |
| WLL-HSK-15K | Heat-shrink kit, multi-layer composite | 8.7/15 kV | Per-core insulation OD, screen structure | IEC 60502, -50 to +125 °C | No published cross-reference |
| WLL-HSK-35K | Heat-shrink kit, multi-layer composite | 26/35 kV | Per-core insulation OD, screen structure | IEC 60502, -50 to +125 °C | No published cross-reference |
| WLL-HSK-SCT | Stress control tube, semi-conductive and insulating composite | Matches the cable rating | Cable insulation OD | Confirmed at quotation | No published cross-reference |
| WLL-MLD-CAP | Adhesive-lined cable end cap | LV | Cable OD at the cut end | Confirmed at quotation | No published cross-reference |
IEEE 386 and IEC 60502 are the standards published against the accessory families on their product pages. Kit-level type-test scope, and whether a report can be issued to your project, is confirmed with the quotation. Cross-identification is for identification only; competitor designations are trademarks of their respective owners.
Selected products for this application
What to send for a kit quotation
Per-core insulation OD
Conductor cross-section
Core count
Screen data
Sheath data
Site restrictions
Engineering questions we are asked
When should a substation use cold-shrink instead of heat-shrink?
When a flame is not allowed or not practical. Switchgear rooms, manholes, cable trenches, refineries and mines usually prohibit an open flame, and heat-shrink needs a heat source to recover. Cold-shrink needs no heat, but the body grips where it is released, so the position has to be right before the spiral core is pulled. Heat-shrink kits remain the lower-cost route where a heat source and a longer prep window exist.
What cable data do you need to quote a termination or joint kit?
Six inputs: per-core insulation OD, conductor cross-section in square millimetres, core count, screen OD and structure, sheath OD and material, and the strip-back lengths from the position drawing. Armour bonding parts are quoted separately and only where the cable is armoured.
Which kit covers an 11 kV and a 33 kV system?
An 11 kV system maps to the 8.7/15 kV accessories and a 33 kV system to the 26/35 kV accessories. For 12/20 kV and 18/20 kV cables the corresponding cold-shrink ranges exist as separate items. Quote on the cable's rated voltage rather than the system nominal, because that is what the position drawing is written against.
Do the kits ship with type-test reports?
The component families carry the published IEEE 386 and IEC 60502 references shown above. Kit-level type-test scope, and whether reports can be issued to your project, is confirmed with the quotation. Ask for it in writing before you approve the kit, and we will state exactly what exists and what does not rather than let the assumption stand.
Is a stress control tube always needed?
No. It is used where the termination geometry concentrates electrical stress and the joint design calls for it, and it has to sit at the correct position over the screen cut-back or it does more harm than good. If your position drawing shows a stress control element we match it. If it does not, describe the cable construction and we will say whether one is needed.
Send the cable data or the position drawing
Per-core insulation OD, conductor size, core count, screen and sheath data, plus the site restrictions on an open flame. We return the kit list, the cable range it covers and lead time.
Related solutions: Cable Joint & Splice Sealing · Busbar & Switchgear Insulation · Industrial Equipment