Overhead Line Silicone Insulation Sleeve
- CCMT
- CHANGCHUN,CHINA
- Based on the order quantity
- 50,000 meters per month
1. The high voltage power line protection cover eliminates the need to remove the entire length of wire and can be installed around existing wires.
2. The silicone overhead line insulation sleeve is made of flame retardant and trace-resistant silicone rubber with a dielectric strength of 20.7 kV/mm and has passed the non-cracking test at low temperature of-40℃ and thermal impact at 90℃.
3. Silicone insulation sleeves are available in models with different voltage classes up to 15 kV and 25 kV, covering a variety of wire diameters and cross-sectional areas.
In the renovation project of overhead distribution lines, the conductor diameters and cross-sectional areas of different lines differ. If the insulating sheath size is selected incorrectly, it may result in misfit installation, insufficient local protection, and increase the workload of on-site adjustment and subsequent maintenance.
CCMT's overhead line covers for insulation enhancement is available in multiple models for lines with different wire diameters, cross-sectional areas and voltage levels. The product is made of flexible silicone rubber material and spiral winding structure, which can be installed around existing wires without removing the entire wire. The corresponding model can be selected according to the wire size and line voltage before purchasing to reduce the risks of wrong specification selection and on-site rework.
Product Parameters:
| Parameter | Specifications / Test Results |
| Material | Flame-retardant, track-resistant silicone rubber |
| Applicable Voltage Class | Up to 25 kV (depending on model) |
| Tensile Strength | 5.3 MPa |
| Elongation at Break | 220% |
| Shore Hardness | A/15: 61 |
| Dielectric Strength | 20.7 kV/mm |
| Low-Temperature Performance | -40 °C, 4 hours: No cracking |
| Thermal Shock Performance | 90 °C, 1 hour: No cracking |
| Volume Resistivity | 6 × 104 Ω·cm |
Model and Size Parameters:
| Model | Applicable Voltage | Applicable Conductor Diameter Range | Maximum Thickness | Applicable Conductor Cross-sectional Area | Standard Length |
| CCI-25-5 | Up to 25 kV | 2–5 mm | 2.8–3.3 mm | 10–50 mm2 | 20 m/roll |
| CCI-15-10 | Up to 15 kV | 9–16 mm | 2.5–3.0 mm | 50–150 mm2 | 20 m/roll |
| CCI-25-10 | Up to 25 kV | 9–16 mm | 3.0–3.5 mm | 50–150 mm2 | 20 m/roll |
| CCI-15-15 | Up to 15 kV | 16–25 mm | 2.5–3.0 mm | 185–400 mm2 | 20 m/roll |
| CCI-25-15 | Up to 25 kV | 16–25 mm | 3.0–3.5 mm | 185–400 mm2 | 20 m/roll |
Note: The actual outer diameter, cross-sectional area, working voltage and installation conditions of the wire should be further confirmed during procurement, and the product technical documents and specifications confirmed by both parties shall prevail.
Product Advantages:
·Flexible structure for easy on-site renovation.
The spiral-wound structure of the silicone rubber overhead line insulating sleeve cover facilitates installation of the sheath around existing wires, reducing the additional construction work caused by removing the wires. Silicone rubber material has certain expansion and bending capabilities, which helps adapt to common mechanical displacements during line operation, and is suitable for line reconstruction and local insulation protection projects.
·Consider insulation and outdoor protection.
The high voltage power line protection cover uses flame retardant and trace resistant silicone rubber to take into account the needs of electrical insulation and outdoor use. After relevant tests, its dielectric strength is 20.7 kV/mm, and no cracking occurs under the low temperature of-40℃ and thermal shock test conditions of 90℃, which helps to meet the line protection needs under different climatic conditions.
Product Application Scenarios:
· Distribution line renovation project: used for local insulation protection of existing overhead distribution lines, allowing for sheath installation without removing the entire section of wire.
· Substation lead and jumper protection: It is used for leads, jumpers and other parts that meet product voltage and size requirements to enhance external insulation protection of wires.
· Industrial park power supply lines: Used for local protection of overhead distribution lines such as factories and parks to reduce the electrical risks caused by accidental contact between wires and external objects.
About Us:
Changchun Chemistry Technology Co.Ltd., Founded in 1986, focuses on the research and development, manufacturing and supply of power and communication cable accessories, and has 40 years of industry experience. Our products cover areas such as heat shrinkage, cold shrinkage, cable joints, insulating sleeves and sealing materials, and can provide relevant product selection and technical support for different power projects.
· Factory size: The production site area is approximately 10,000 square meters.
· Number of employees: more than 200.
· Production equipment and production lines: 40 professional production lines.
· Supply capacity: The monthly supply capacity of silicone rubber insulation sheath for overhead lines is 50,000 meters. The actual delivery volume is based on the model, order quantity and production schedule.
· Quality and product certification: Passed ISO 9001:2015 quality management system certification (certificate number: 00123Q36311R5M/2200) and CE-related certification information, and provided third-party type test reports, RoHS and REACH compliance information.
Export and project experience.
Our company has exported to the Middle East, Southeast Asia, South America and other regions, including markets such as Saudi Arabia, United Arab Emirates, India, Thailand, Brazil and Argentina. It also participated in the supply of cable accessories related to Tianwan Nuclear Power Station, Taishan Nuclear Power Station and Ling 'ao Nuclear Power Station. The above cases also enhanced the company's project experience in the nuclear power field.
Exhibition style.
In November 2025, we participated in the 32nd China International Electric Power Equipment and Technology Exhibition (EP Shanghai 2025) and had face-to-face exchanges with power engineering contractors, equipment manufacturers and purchasers from Asia, Europe, the Middle East and South America.
Understand the actual needs of different markets in terms of product specifications, voltage levels, quality certification and customized procurement, and share product selection and supporting solutions for specific application scenarios. Through on-site product display and technical communication, opportunities are created for subsequent technical docking, procurement cooperation and the establishment of long-term supply relationships.
FAQ:
1. How to select a suitable silicone overhead line insulation sleeve for overhead lines?
The line working voltage, the actual outer diameter of the wire, the cross-sectional area of the wire and the required sheath thickness should be comprehensively checked. Models cannot be selected based on cross-sectional area alone, as different lead structures may have differences in outer diameters.
2. Can this sheath be used in outdoor low-temperature environments?
Our sheath showed no cracking after 4 hours of testing at-40℃. It can be your choice in low-temperature environments, but specific applications also need to consider temperature changes, ultraviolet light and other environmental factors.
3. Does installation of the sheath require removal of existing wires?
The spiral-wound structure facilitates installation around existing wires, usually without removing the entire length of wire.
