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6-35kV Cold Shrinkable Cable Accessories are high performance solutions for medium voltage power cable terminations and joints. The series includes:
4E NLS Cold Shrink Indoor Termination
4E WLS Cold Shrink Outdoor Termination
4E JLS Cold Shrink Middle Joint
These accessories are mainly composed of:
Prefabricated body (integrated stress cone + insulating body)
Terminations (indoor or outdoor) or connecting tube (for middle joint)
Cold shrink multi core fingerstall (for multi core cables)
Cold shrink insulation tubes and colorimetric tubes
The prefabricated body is manufactured using liquid silicone rubber injection molding, offering long term stability, uniform electric field distribution, and consistent radial pressure on the cable body.
Excellent interface characteristics prevent respiratory creepage breakdown during cable operation. Terminations and connecting tubes are designed to meet cable core material requirements and user specifications, ensuring reliable insulation protection and waterproof performance.
| Feature | Description |
|---|---|
| Excellent raw material | Prefabricated body made of high quality liquid silicone rubber – excellent insulation, elongation, breakdown strength, and low residual deformation after expansion |
| Cold shrink structure | Manufactured using advanced expansion equipment and support tubes, ensuring product integrity without damage during expansion |
| Easy installation | No special training required; low labor cost due to simple, tool free installation |
| Parameter | Value |
|---|---|
| Rated Voltage | 6 kV – 35 kV |
| Power Frequency Withstand Voltage | As per IEC 60502 (depending on voltage class) |
| Lightning Impulse Withstand Voltage | As per IEC 60502 |
| Partial Discharge Level | ≤ 10 pC at 1.73 U₀ |
| Rated Current | Up to 630 A / 800 A / 1250 A (depending on cable size) |
| Short Circuit Current (1 sec) | Up to 31.5 kA |
| Operating Temperature | -40°C to +90°C |
| Product Type | Model | Application |
|---|---|---|
| Cold Shrink Indoor Termination | 4E NLS | For indoor switchgear, transformers, and panels |
| Cold Shrink Outdoor Termination | 4E WLS | For outdoor overhead lines, substations, and exposed installations |
| Cold Shrink Middle Joint | 4E JLS | For straight through connection of XLPE or PILC cables |
| Sector | Application |
|---|---|
| Power Distribution Networks | 6kV – 35kV primary and secondary distribution |
| Substations | Transformer and switchgear terminations |
| Industrial Plants | Factories, mines, petrochemical facilities |
| Renewable Energy | Solar farms, wind power connections |
| Infrastructure | Tunnels, airports, railways |
| Benefit | Description |
|---|---|
| High quality liquid silicone | Superior electrical and mechanical properties |
| Cold shrink technology | No heat required – safer and faster installation |
| Uniform electric field | Integrated stress cone ensures PD free operation |
| Waterproof & sealed | Reliable protection against moisture ingress |
| Long service life | 30+ years under normal operating conditions |
| Wide cable compatibility | Suitable for XLPE, EPR, and PILC cables; copper or aluminum conductors |
Rated voltage UO/U (Um) KV | 6/10(12.5) | 8.7/15(17.5) | 26/35(40.5) | Railway Uo=27.5 | Test result | |||
5min frequency voltage test | no flashover, without breakdown under 4.5Uo | no flashover, without breakdown | ||||||
1min frequency voltage under rain test | no flashover, without breakdown under 4Uo | no flashover, without breakdown | ||||||
Partial discharge at room temperature test | discharge volume under 1.73Uo ≤10PC | ≤1.6pC | ||||||
Constant voltage load cycle in the air test | heated 2.5Uo and conductor to a temperature to 95-100°C three times, no flashover, without breakdown | no flashover, without breakdown | ||||||
Partial discharge at high temperature test | heated cable conductor to 95-100C,discharge volume under 1.73Uo ≤10PC | ≤1.6pC | ||||||
Partial discharge at room temperature test | discharge volume under 1.73Uo ≤10PC | ≤1.6pC | ||||||
Impulse voltage at high temperature test | 75 kV | 95 kV | 200 kV | 250 kV | no flashover, without breakdown | |||
heated cable conductor to 95-100°C,both positive and negative polarity 10 times, no flashover, without breakdown | ||||||||
Constant voltage load cycle test | heated 2.5Uo and conductor to a temperature to 95-100°C sixty times, no flashover, without breakdown | no flashover, without breakdown | ||||||
Partial discharge at high temperature test | heated cable conductor to 95-100°C,,discharge volume under 1.73Uo ≤10PC | ≤1.6pC | ||||||
Partial discharge at room temperature test | discharge volume under 1.73Uo ≤10PC | ≤1.6pC | ||||||
Impulse voltage test | 75 kV | 95 kV | 200 kV | 250 kV | no flashover, without breakdown | |||
both positive and negative polarity 10 times, no flashover, without breakdown | ||||||||
15min frequency voltage test | no flashover, without breakdown under 2.5Uo | no flashover, without breakdown | ||||||
Outdoor termination salt spray test | 1.25 Uo,1000h,no flashover, without breakdown, no significant electrical corrosion and mechanical damage | no flashover, without breakdown | ||||||
Indoor termination wet test | 1.25 Uo,300h,no flashover, without breakdown, no significant electrical corrosion and mechanical damage | no flashover, without breakdown | ||||||
6-35kV Heat Shrinkable Cable Accessories:
4E-NRS, 4E-WRS, 4E-JRS heat shrinkable series cable accessories is applied to 35kV and below rubber cable. Heat shrink cable accessories is using import multiphase polymer, it’s the update products of wrapped type cable accessories. With convenient installation, keep on suitable radial pressure on the cable body, interface characteristic is good. the parameter type stress control tube to improve the distribution of the electric field, which can effectively solve the cable outer shield section in electric stress concentration problem. The electrical properties are improved from wrapped type cable accessories to ensure the safety and reliable operation. The main components are tubular, basically including stress control tube, insulation tube, three fingered tube, sealed tube protective sleeve, etc.
Main performance and structure features：
Technical performance: meet BS EN 50181, IEC60502, GB/T12706 requirements.
Heat shrink raw materials: stress tube is parameter type, well-distributed electric field at the insulating cable cut off place. Insulating tube has insilation effect, protective sleeve has protection effect. Product heat shrink is quite stable, can shrink to the original size in heating condition, the residual deformation is small. All the products are processing forming in the factory. There’s no need to use fire, no special training, installation is simple and fast.
It has resistance to filth, aging, and good waterproof, with superior cold heat resistant performance.
Surface is smooth and beautiful.
No | Name | Model | Voltage | Cable Cross section | Voltage | Cable Cross section |
1 | Heat shrink indoor termination | 4E-NRS-8.7/15-1 | 6/10 8.7/10 8.7/15 | 25～70mm² | 8.7/15 | 25～50mm² |
4E-NRS-8.7/15-2 | 95～185mm² | 70～150mm² | ||||
4E-NRS-8.7/15-3 | 240～400mm² | 185～300mm² | ||||
4E-NRS-8.7/15-4 | 500～800mm² | 400～630mm² | ||||
2 | Heat shrink outdoor termination | 4E-WRS-8.7/15-1 | 25～70mm² | 25～50mm² | ||
4E-WRS-8.7/15-2 | 95～185mm² | 70～150mm² | ||||
4E-WRS-8.7/15-3 | 240～400mm² | 185～300mm² | ||||
4E-WRS-8.7/15-4 | 500～800mm² | 400～630mm² | ||||
3 | Heat shrink middle joint | 4E-JRS-8.7/15-1 | 25～70mm² | 25～50mm² | ||
4E-JRS-8.7/15-2 | 95～185mm² | 70～150mm² | ||||
4E-JRS-8.7/15-3 | 240～400mm² | 185～300mm² | ||||
4E-JRS-8.7/15-4 | 500～800mm² | 400～630mm² | ||||
4 | Heat shrink indoor termination | 4E-NRS-26/35-1 | 18/30 21/35 26/35 | 50～150mm² | 26/35 | 50～120mm² |
4E-NRS-26/35-2 | 185～300mm² | 150～240mm² | ||||
4E-NRS-26/35-3 | 400～500mm² | 300～400mm² | ||||
4E-NRS-26/35-4 | 630～800mm² | 500～800mm² | ||||
5 | Heat shrink outdoor termination | 4E-WRS-26/35-1 | 50～150mm² | 50～120mm² | ||
4E-WRS-26/35-2 | 185～300mm² | 150～240mm² | ||||
4E-WRS-26/35-3 | 400～500mm² | 300～400mm² | ||||
4E-WRS-26/35-4 | 630～800mm² | 500～800mm² | ||||
6 | Heat shrink middle joint | 4E-JRS-26/35-1 | 50～150mm² | 50～120mm² | ||
4E-JRS-26/35-2 | 185～300mm² | 150～240mm² | ||||
4E-JRS-26/35-3 | 400～500mm² | 300～400mm² | ||||
4E-JRS-26/35-4 | 630～800mm² | 500～800mm² |
Application Scenarios
Medium-voltage power system: Applicable to power transmission and distribution systems with voltage levels of 6-35kV.
Urban infrastructure construction: Especially suitable for underground cable laying to ensure the stability of urban power supply.
Product Advantages
Simple installation process: Using cold shrink technology, no special training is required, and the installation is fast and convenient.
Long-term stability: The product has excellent electrical performance and anti-aging ability, and can operate stably even in long-term high temperature and high humidity environments.
FAQs
Q: What voltage levels of cables are the products suitable for?
A: Our medium-voltage cold shrink cable accessories are suitable for cable systems with voltage levels of 6-35kV, covering a variety of terminals and intermediate joints to meet different application requirements.
Q: How to install cold shrink cable accessories?
A: This product is very simple in design and uses cold shrink technology, so no special training is required. Just follow the installation manual provided.
