Cold Shrink Cable Accessories: 0.6/1kV to 26/35kV
Cold shrink cable accessories — terminations, joints and transition kits — are the fastest-growing choice for low- and medium-voltage power cable systems that cannot tolerate an open flame on site. WELLELE supplies custom cold shrink cable accessories from 0.6/1 kV to 26/35 kV, each kit built from pre-expanded EPDM or silicone rubber sleeves that recover onto the cable when the support core is removed — no heat gun, no torch, no waiting for the cable to cool. Every order is drawing-based: we review your cable size, voltage class and installation method before quotation, and ship with first-article inspection (FAI), batch traceability and certificate of conformance (COA). This page is the specification starting point for sourcing cold shrink cable accessories on a tender or maintenance programme.
Why choose cold shrink over heat shrink?
Heat shrink needs a controlled heat source and an operator who applies it evenly; get the heating profile wrong and the sleeve shrinks unevenly or the adhesive never flows. Cold shrink removes that variable entirely — the sleeve is pre-expanded at the factory over a removable spiral core, and recovery is driven by the rubber's own memory. The result is identical, repeatable installation on every joint, faster work in confined spaces (cable trenches, switchgear cubicles), and zero fire risk. The trade-off is a slightly higher unit cost and the need to size the sleeve to the cable before the core is pulled. If your crew works in the field with no power source, or your QA process demands reproducible results, cold shrink is the lower-risk specification — and the reason WELLELE made cold shrink cable accessories a dedicated drawing-based product line rather than a catalogue extension. (For a detailed comparison, see our guide Heat Shrink vs Cold Shrink Tubing.)
Product line: one page, five voltage classes
We consolidate the full WELLELE cold shrink cable accessories range on a single page so you can compare series before requesting a quote. All five series share the same build philosophy — pre-expanded silicone or EPDM rubber, integrated stress control, IP67/IP68 sealing — and differ in voltage class, cable cross-section and stress-control layer count.
| Series | Voltage class | Cable range (Cu/Al) | Sleeve material | Operating temperature | Protection | Standards |
|---|---|---|---|---|---|---|
| LSY | 0.6/1 kV | 10–300 mm² | EPDM or silicone, dual-wall adhesive lined | -40 °C to +90 °C (EPDM); -55 °C to +200 °C (silicone) | IP67 | ASTM D2048, IEC 60228, UL 224 (FR), RoHS, REACH |
| — | 8.7/15 kV | 25–800 mm² | Silicone, integrated stress control | -55 °C to +90 °C / +200 °C | IP67 | IEEE 404, EN 50068, CENELEC HD 628 |
| — | 12/20 kV | 50–1000 mm² | High-strength silicone, dual-wall stress control | -55 °C to +90 °C / +200 °C | IP67 | IEEE 404, EN 50068, CENELEC HD 628, GB 18293 |
| — | 18/20 kV | 70–1000 mm² | High-energy silicone, tri-layer stress control | -55 °C to +90 °C / +200 °C | IP68 (submersible) | IEEE 404, EN 50068, CENELEC HD 628, GB/T 22794 |
| — | 26/35 kV | 95–800 mm² | High-dielectric silicone, quad-layer stress control | -55 °C to +90 °C / +200 °C | IP68 (submersible) | IEEE 404, EN 50068, CENELEC HD 628, GB/T 22794, IEC 60250 |
How to read this table. Voltage class drives wall thickness and stress-control layer count; cable range drives bore matching. At 0.6/1 kV you can specify EPDM for budget or silicone for temperature and UV duty — both available with dual-wall adhesive lining. From 8.7/15 kV up, all sleeves are silicone rubber with integrated stress-control cones; the 18/20 kV and 26/35 kV series add a third and fourth layer to smooth field distortion at the shield cutoff. Not sure which series fits? Send cable size, shield construction and installation environment via the RFQ form — our engineers confirm voltage class, cable cross-section and stress-control requirement before quoting, and tell you which grade costs less when two options both work. Cold shrink cable accessories are built to your drawing, not just to this table.
Stress control: why 35 kV needs four layers
The service life of a cold shrink cable accessory is limited not by the rubber itself but by electrical stress concentration at the semiconductor shield cutoff. The higher the voltage class, the stronger the field distortion, and the more stress-control layers are needed to smooth the potential gradient:
- Integrated stress-control cone (8.7/15 kV): single cone structure, sufficient for routine MV distribution
- Dual-wall stress control (12/20 kV): semiconductive layer added over the cone for higher load currents
- Tri-layer structure (18/20 kV): geometric stress-control layer added for high-energy MV systems (large cross-sections, heavy-duty feeders)
- Quad-layer structure (26/35 kV): high-dielectric silicone with multiple semicon/insulation layers for 35 kV-class field distribution
Every layer is molded together with the sleeve during factory pre-expansion — nothing is wound by hand on site. That factory-integrated construction is the direct source of installation consistency, and it is the main reason our cold shrink cable accessories outlive field-wrapped insulation in accelerated aging tests.
What is inside a cold shrink kit?
A cold shrink cable accessories kit is a matched set of components, not a single part. Knowing what is inside helps you verify the packing list on arrival:
- Termination: cable end sealing and insulation for switchgear, transformer or motor connection — includes stress-control cone, insulating sleeve, sealant and earthing components; outdoor types add sheds
- Joint: the splice between two cable ends — outer semicon restoration, stress-control overlap, insulation build-up; the most installation-sensitive part of the kit
- Transition / branch components: for cables of different cross-sections or insulation types (XLPE to paper-insulated)
- Accessories: cleaner wipes, abrasive cloth, sealant tape, earthing braid
For medium-voltage kits (8.7/15 kV and above), the stress-control assembly is the life-determining component, and the layer count is the specification that separates one cold shrink cable accessories series from the next. Because WELLELE molds the cone and insulation in one piece, the installer never touches stress-control material — a clear safety and consistency advantage over site-wrapped designs.
Installation: pull the core, one shot
Cold shrink installation has one critical step: pull the support core out of the pre-expanded sleeve at a steady speed, and the sleeve recovers onto the cable. Key control points from our installation instructions:
- Stripping dimensions: remove the semiconductive layer to the marked position; keep the shield cutoff clean (it affects stress-control performance)
- Surface preparation: wipe the insulation with the supplied cleaner to remove grease and silicone residue
- Position marking: confirm sleeve coverage before pulling the core (overlap length is set by voltage class)
- Steady core pull: avoid pauses that trap air or create wrinkles
- Inspection: check both ends for full sealant contact and no lifted edges
A trained operator completes a 12/20 kV joint in roughly 20–30 minutes, with no heat source — the same procedure is reproducible at any site, which is why utilities are replacing heat-shrink specifications with cold shrink cable accessories on new tenders. Installation instructions and dimensional data ship with every kit; for first orders we can join a remote call during your trial installation.
Why OEMs and contractors specify WELLELE
Catalogue cold shrink cable accessories cover standard cable sizes, but real projects rarely use catalogue dimensions: flame-retardant jackets, double armour, odd shield geometries, special lengths. WELLELE treats cold shrink cable accessories as drawing-made insulation parts rather than stocked commodities:
- Dimensions to your drawing: bore, wall, length and colour adjusted to the cable specification — no forced standard part numbers
- Engineering review before quotation: voltage class, stress-control layer count and installation method confirmed up front, so the mismatch is found at RFQ, not at the first site visit
- Full documentation: FAI, in-process records, COA and batch traceability shipped with the order to satisfy project acceptance
- One-stop bundling: the same purchase order can include busbar sleeves, dual-wall heat-shrink tubing and other insulation parts, cutting supplier interfaces
If your tender says "cold shrink cable accessories to be custom-sized to the cable, with stress control, FAI and COA required", that is exactly the specification we manufacture to.
Typical applications
Our cold shrink cable accessories cover five voltage classes across the following project types:
- Urban distribution networks: cable joints and terminations (8.7/15 kV, 12/20 kV most common)
- Mining and industrial plants: cable accessories in explosion-risk or underground zones where open flame is not permitted (0.6/1 kV to 12/20 kV)
- Solar and ESS grid connection: MV cable accessories at the substation (12/20 kV to 26/35 kV), alongside our EV/ESS insulation solutions
- Rail and tunnels: fast installation in confined spaces (0.6/1 kV, 18/20 kV)
- Coastal and wet environments: IP68 submersible series (18/20 kV, 26/35 kV)
Quality and compliance
Every cold shrink cable accessory order is produced and documented under the same control plan:
- Standards: ASTM D2048, IEC 60228, UL 224 (flame retardant), IEEE 404, EN 50068, CENELEC HD 628, GB/T 22794, IEC 60250; RoHS and REACH compliant across the range; manufactured under ISO 9001:2015
- Inspection: FAI per your inspection plan; in-process dimensional checks at every station; COA with lot traceability to incoming material certificates
- Optional testing: dielectric strength and insulation resistance testing on request
Custom process (drawing-driven, not catalogue)
Quoting custom cold shrink cable accessories is a five-step process:
- Submit cable specification and drawing via the RFQ form
- Engineering review: voltage class, cable cross-section, stress-control requirement and installation method (response within 24 hours)
- Quotation: material selection, tolerances and inspection plan
- Production: batch traceability with in-process inspection
- Delivery: COA/FAI reports with the shipment; export packaging per INCOTERMS
Standard lead time 30–45 days after drawing approval; express prototypes 7–10 days. Weekly consolidations to EU, Middle East, North America and Asia-Pacific.
Common questions
What is the difference between cold shrink and heat shrink accessories?
Cold shrink sleeves are pre-expanded at the factory over a removable core; removing the core makes them recover onto the cable without heat. Heat shrink requires a heat gun and depends on operator technique. Cold shrink offers higher installation consistency and no open flame, at a slightly higher unit cost — the trade-off that makes cold shrink cable accessories the preferred spec for utilities.
Can you customise cold shrink cable accessories to my cable?
Yes. We build cold shrink cable accessories to your drawing and cable specification: bore matching, stress-control layer count, length and colour can all be adjusted. Send the cable cross-section, shield construction and voltage class, and we confirm before quoting.
EPDM or silicone for 0.6/1 kV?
EPDM is the lower-cost choice for indoor, moderate-temperature duty. Silicone (-55 °C to +200 °C) is specified for high-temperature, outdoor UV or wide temperature-range environments. Both can be supplied with dual-wall adhesive lining.
Where are the IP67 and IP68 series used?
IP67 series (0.6/1 kV, 8.7/15 kV, 12/20 kV) covers normal dust and water protection. IP68 series (18/20 kV, 26/35 kV) withstands temporary submersion for cable trenches, coastal and tunnel installations. State the installation environment in your enquiry so we can match the cold shrink cable accessories to the exposure class.
Which standards do your cold shrink accessories meet?
Low-voltage series: ASTM D2048, IEC 60228, UL 224. Medium-voltage series: IEEE 404, EN 50068, CENELEC HD 628, with GB 18293 / GB/T 22794 / IEC 60250 where applicable. RoHS and REACH compliant, ISO 9001:2015 system.
What is the MOQ and lead time?
MOQ varies by product and size; we keep it as low as possible. Standard production 30–45 days after drawing and inspection-plan approval; express prototypes 7–10 days.
Can you provide FAI, COA and batch traceability?
Yes. FAI is performed per your plan, COA with batch traceability (to incoming material certificates) ships with the order, and dielectric/insulation resistance test reports are available on request — the documentation package utilities require when accepting cold shrink cable accessories.
What should we watch for when installing 26/35 kV?
The quad-layer stress-control structure is cleanliness-sensitive: strip to the marked position, clean the shield cutoff with the supplied wipe, and pull the core at a steady speed to avoid contamination of the inner wall. Installation instructions and remote guidance are available with the order. ---
Engineering Guides & Selection Notes
Related technical articles that help specify this product.
Get pricing for Cold Shrink Cable Accessories: 0.6/1kV to 26/35kV
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