Cold Shrinkable Intermediate Joint

✅Flameless & Safe Execution: Completely eliminates the need for open flames or heating equipment, ensuring maximum safety in volatile or hazardous environments.
✅Rapid Installation: Streamlines on-site assembly, drastically reducing labor hours and system downtime.
✅Broad Cable Compatibility: High elasticity allows a single kit to adapt perfectly to a wide range of cable outer diameters and cross-sections.
✅High-Integrity Environmental Seal: Delivers exceptional waterproof performance, tracking resistance, and anti-aging durability under harsh conditions.
✅Optimized Electrical Stress Control: Engineered to effectively manage and redistribute electrical stress fields, ensuring long-term dielectric stability.
✅Extended Operational Lifespan: Built to withstand continuous, decades-long operation in demanding outdoor, underground, or direct-burial applications.

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Product Introduction

The 1kV, 10kV, and 35kV cold shrinkable intermediate joints are high-performance solutions designed to connect two separate cable sections securely. Utilizing advanced cold shrink technology, these joint kits deliver a high-tension, perfectly contoured fit around the cable interface.

Each cold shrinkable intermediate joint is professionally pre-expanded at the factory over a removable plastic support core. During field installation, the operator simply pulls out the inner core, allowing the joint to automatically collapse and tightly shrink onto the cable. This continuous radial pressure ensures an airtight, moisture-proof seal and a highly reliable electrical connection.

Components

cold Shrink

1kV to 35kV cold shrinkable intermediate joint

Considering these situations that may occur in the application, such as the crimping extension of the connecting pipe and the shrinking of the cable insulation layer. Under the premise of not affecting the electrical performance, the length of the inner shield tube is optimized and lengthened during the structural design.

cold Shrink

Technical Challenge

In real-world cable joint applications, two critical structural shifts routinely occur:

Crimping Elongation: The process of crimping the conductor connecting sleeve (ferrule) causes the metal to extend axially.
Insulation Retraction: Thermal cycling and structural relaxation cause the cable's primary insulation layer to shrink or pull back over time.

Engineering Solution

To accommodate these operational variables without compromising the joint's integrity, the structural design of the inner shield tube has been optimized and strategically lengthened.

Key Advantages

1.Guaranteed Electrical Performance: The extended shielding ensures full coverage over the connector and insulation interface, maintaining a uniform electrical field and preventing partial discharge-even after material shifting.

2.Mechanical Tolerance Buffer: By absorbing the combined effects of connector elongation and insulation shrinkage, the optimized length eliminates the risk of exposed gaps.

3.Long-Term Reliability: This proactive design enhancement prevents premature insulation breakdown, ensuring the joint remains secure throughout its operational lifespan under varying thermal loads.

Working Prodedures

Step-by-Step Mechanism

1.Factory Pre-Expansion：Manufacturing Phase

The high-elasticity elastomeric body is mechanically expanded at our factory and mounted onto a heavy-duty, removable plastic spiral support core. This maintains the joint or termination in a widened, ready-to-install state.

2.Field Positioning：Installation Phase

Once the power cable is properly prepared, stripped, and cleaned on-site, the cold shrink assembly is slid easily over the cable joint interface. It is manually aligned to its precise, designated position.

3.Radial Collapse & Active Sealing：Final Activation

The installer pulls the loose end of the plastic spiral support core, unwinding and removing it from the tube. Stripped of internal support, the elastic material memory triggers a rapid, uniform radial contraction. It tightly grips every layer of the cable, creating a high-tension, moisture-proof active seal that dynamically adapts to thermal expansion and contraction.

Product Models

1kV 10kV 35kV cold shrinkable intermediate joints

Voltage level	Number of Cores	Product code	cable cross section(mm²)
0.6/1(1.8/3)kV	3-core intermediate Joint	JLS-1-3.1	25~50
		JLS-1-3.2	70~120
		JLS-1-3.3	150~240
		JLS-1-3.4	300~400
	4-core intermediate Joint	JLS-1-4.1	25~50
		JLS-1-4.2	70~120
		JLS-1-4.3	150~240
		JLS-1-4.4	300~400
	5-Core intermediate Joint	JLS-1-5.1	25~50
		JLS-1-5.2	70~120
		JLS-1-5.3	150~240
		JLS-1-5.4	300~400
8.7/10(8.7/15)kV	Single intermediate joint	JLS-8.7/15-1.1	25~50
		JLS-8.7/15-1.2	70~120
		JLS-8.7/15-1.3	150~240
		JLS-8.7/15-1.4	300~400
		JLS-8.7/15-1.5	500~630
	3-core intermediate joint	JLS-8.7/15-3.1	25~50
		JLS-8.7/15-3.2	70~120
		JLS-8.7/15-3.3	150~240
		JLS-8.7/15-3.4	300~400
		JLS-8.7/15-3.5	500~630
26/35kV	Single core intermediate joint	JLS-26/35-1.1	50~95
		JLS-26/35-1.2	120~185
		JLS-26/35-1.3	240~400
		JLS-26/35-1.4	500~630
	Three-core intermediate joint	JLS-26/35-3.1	50~95
		JLS-26/35-3.2	120~185
		JLS-26/35-3.3	240~400
		JLS-26/35-3.4	500~630

Product Advantages

Flameless, Tool-Free Installation (No Heat Required)

Cold shrink technology completely eliminates the need for open flames, torches, or specialized heating equipment. This significantly simplifies the installation process, reduces labor hours, and eliminates fire hazards on the job site.

Factory Pre-Expanded Design

The elastomeric sleeve comes pre-expanded over a removable plastic core. During installation, simply pulling out the core triggers an automatic, uniform radial collapse onto the cable. This ensures a flawless, high-tension fit without relying on installer guesswork.

Impermeable Moisture & Waterproof Sealing

Engineered with high-grade silicone or EPDM rubber, these kits exert continuous radial pressure. This creates a permanent, high-integrity environmental seal that completely prevents water and moisture ingress, protecting the cable from harsh outdoor or underground conditions.

High Electrical & Mechanical Reliability

The elastic material maintains constant geometric pressure, expanding and contracting dynamically with the cable during thermal cycling. This prevents internal voids, resists tracking, and provides robust mechanical protection, significantly extending the lifespan of the cable connection.

Streamlined Logistics & Storage

Because they do not require bulky heating tools, propane tanks, or specialized power supplies, these lightweight kits are exceptionally easy to transport, store, and deploy in confined or remote field conditions.

Environmentally Friendly & Clean

The entire installation relies purely on mechanical memory-involving zero combustion, emissions, or chemical chemical reactions. This makes cold shrink technology an eco-friendly choice for modern grid construction.

Instalation Guide


1. Place the Cold Shrink splice body onto the prepared cable, connect the cores and clean cables thoroughly.	2. Thoroughly grease the connected cable in preparation for the cable splice body.	3. Once in position, begin to remove the inner coil from the cable joint body.	4. For extra peace of mind, take advantage of the fact that cable splice body position is easily checked.

5. Place the earth stocking over the splice body. Ground and secure with Constant Force Springs.	6. Insulate the constant force springs with Rubber Splicing Tape and then overlay with Rubber Mastic Tape	7. Position the pre-parked Cold Shrink Outer Protection Tube over the stocking and beginning to remove the inner supporting core.	8. Continue to remove the inner core until the outer tube is fully shrink, completing the cable joint.