50-630mm2 Heat Shrink Termination 1000V 33-35KV Indoor Cable

Heat Shrink Termination

Product Overview

Heat Shrink Termination is a cable termination solution engineered for medium and high-voltage power cable systems. The termination kit comprises heat-shrinkable components manufactured from cross-linked polyolefin and advanced polymer materials—typically a blend of polyethylene, ethylene vinyl acetate (EVA), and ethylene propylene rubber. When heated using a propane torch or specialized heat gun, the material recovers to its original shape, shrinking uniformly onto the cable substrate while simultaneously activating the internal thermoplastic adhesive to form a durable, watertight seal.

This termination technology serves as a modern alternative to traditional cable terminations that relied on porcelain bushings, cable compounds, and bulky metal housings. Heat shrink terminations are considerably lighter and more compact, while offering comparable—and in many cases superior—electrical insulation and mechanical protection. 

Product Features

1. Superior Electrical Performance

The termination incorporates built-in stress control technology that ensures uniform electric field distribution across the cable termination point. This design effectively manages electrical stress at the semiconductor screen cut, preventing corona discharge and tracking—two primary failure mechanisms in cable terminations. The product demonstrates excellent insulation properties with partial discharge levels consistently below 10pC under rated voltage conditions.

2. Robust Mechanical and Environmental Protection

Engineered for long-term durability, heat shrink terminations offer:

• High mechanical strength capable of withstanding installation stresses and operational vibration

• Strong UV resistance ensuring reliable performance in direct sunlight exposure

• Exceptional weather resistance suitable for harsh outdoor and industrial environments

• Corona and tracking resistance maintaining insulation integrity under high electrical stress

3. Versatile Cable Compatibility

The termination is compatible with a wide range of cable types and configurations:

• Cable insulation types: XLPE (cross-linked polyethylene), PVC, EPR (ethylene propylene rubber), and other polymer cables

• Conductor materials: Suitable for both copper and aluminum conductors

• Core configurations: Available for single-core, two-core, three-core, four-core, and five-core cables

• Cable constructions: Applicable to armored and unarmored cables, including tape/wire shielded configurations

4. Efficient Installation

The product features a simple, rationally designed structure that enables quick assembly. Installation requires only standard heating equipment—typically a propane torch or industrial heat gun—and can be completed in a fraction of the time required for traditional porcelain-type terminations. Components are pre-engineered to fit specific cable cross-sections, minimizing on-site measurement and customization.

5. Comprehensive Kit Content

Each termination kit includes all necessary components for a complete installation: heat-shrinkable insulation tubes, stress control tubes, cable breakout gloves (for multi-core cables), sealing mastics, installation instructions, and—depending on configuration—mechanical or compression cable lugs.

Electrical Performance Parameters

Application Areas

Heat shrink terminations are deployed across a broad spectrum of power system applications, from low-voltage distribution networks to high-voltage transmission infrastructure.

1. Outdoor High-Voltage Transmission Lines

In outdoor overhead and underground transmission systems, heat shrink terminations protect cable connection points against environmental degradation. The UV-resistant and weatherproof construction ensures long-term stable operation even under direct sunlight, temperature extremes, and precipitation. These terminations are particularly valuable for utility-scale transmission projects where reliability and minimal maintenance are paramount.

2. Indoor High-Voltage Electrical Equipment

Within indoor switchgear, transformer compartments, and air-insulated cable end boxes, heat shrink terminations provide superior electrical insulation and mechanical protection. The compact construction length makes them ideal for space-constrained installations where traditional terminations cannot be accommodated. Flame-retardant properties meet the stringent safety requirements for indoor electrical installations.

3. Medium and Low-Voltage Distribution Systems

In medium and low-voltage distribution networks—including industrial plants, commercial buildings, and residential complexes—these terminations effectively shield cable connection points against electrical faults. The material's flexibility and shrinkability ensure a tight fit against cable surfaces, delivering reliable sealing that prevents moisture ingress and contamination.

4. Specialized Infrastructure Applications

The technology has been successfully deployed in demanding infrastructure projects, including water and power utilities where customized high-voltage heat shrink terminations accommodated large-diameter paper-insulated lead-covered (PILC) cables and strict bend radius limitations. Terminations have also been proven effective in petrochemical facilities, metallurgical plants, railway systems, and port construction projects.

5. Multi-Core Cable Systems

For applications requiring multi-core cable termination—including 3+1, 4+1, and 3+2 cable configurations—the termination system accommodates multiple conductors with integrated cable breakouts and bushing boots. This versatility makes the product suitable for complex power distribution scenarios where multiple circuits are routed through a single cable.

Product FAQ

Q1: What is the difference between heat shrink termination and cold shrink termination?

Heat shrink termination relies on the application of external heat (via propane torch or heat gun) to activate the material's molecular memory, causing it to shrink and seal onto the cable. Cold shrink technology, by contrast, uses pre-expanded elastomeric components held in place by a removable plastic core; installation requires no external heat source—the core is simply pulled out, allowing the material to recover elastically. Heat shrink generally offers superior resistance to UV, ozone, and extreme temperatures, while cold shrink provides faster installation without the need for heating equipment.

Q2: What are the most common causes of heat shrink termination failure?

The majority of failures stem from improper installation or inadequate workmanship. Key failure modes include:

• Under-shrinking: Insufficient heating results in incomplete recovery and inadequate sealing

• Core misplacement: Cable cores positioned too closely or crossed can create high-stress zones and corona discharge

• Poor surface preparation: Contaminants, moisture, or oxidation on the cable surface compromise adhesive bonding

• Environmental degradation: Moisture ingress, salt exposure, or chemical attack—particularly when sealing is inadequate—accelerates material deterioration

• Incorrect kit selection: Choosing the wrong size for the cable cross-section compromises the termination's integrity

Q3: How do I select the correct termination kit for my cable?

Selection depends on three primary factors: (1) voltage rating of the cable system, (2) cable cross-section (conductor size in mm²), and (3) number of cores (single-core versus multi-core). Reference the selection table provided in the product documentation, ensuring that the minimum and maximum cable dimensions fall within the kit's specified range. When operating at the upper end of a kit's conductor range, selecting the next larger kit size may be necessary.