Underground cable insulators provide stable mounting and guide support for cables in electrical distribution systems, including manholes, cable trenches, and substations. They minimize cable tilting, swaying, or drooping by resting securely on cable rack hooks.
The insulators feature a smooth, generous radius seat that accommodates cables without sharp edges, reducing damage risk. Models such as the J5122 are compatible with J513_A series hooks, while U604, U604C, and U604AWD insulators engage with U670_ and U602/U603 series hooks. The design resists chipping and breakage, with comprehensive product lines including over 50 models varying in width, length, and radius to suit specific requirements.
Manufactured from high-grade white electrical porcelain using the dry process, these insulators offer consistent, robust material composition with a white glaze finish. Key specifications include lengths of 3 inches, widths of 2-3/4 inches, and slot widths of 1-9/16 inches in certain models. Radii range from approximately 1-9/16 inches upward depending on type. Weights vary, with the U604 model at 168 pounds per 100 pieces and U604C at 140 pounds per 100 pieces.
Applications include wet or dry locations, direct burial, and underground ducts in residential, commercial, and industrial distribution circuits. Mounting hardware, including galvanized steel channel backs and drilled or slotted supports, facilitates installation across various cable rack systems.
Leading Underground Cable Insulator Wholesaler
RaxPower is China’s leading manufacturer of pole line hardware, established in 2003 with over 21 years of manufacturing and exporting experience.
Located in Hebei Province, our facilities include 17,000 square meters of production workshops and 5,000 square meters of warehouses, supported by a team of over 170 employees, including professional technicians and engineers.
We believe in continuous modernization and lean manufacturing, guided by the principle “quality is life, reputation is base.” Our advanced processes, such as hot forging for greater strength and accurate sizing, along with strict quality control, automation, and multi-stage testing, ensure that our Underground Cable Insulators deliver reliable protection under the tightest bend radii and extreme temperatures.
We invite you to experience our commitment to excellence. Fill out the inquiry form for free samples and fast delivery.
| Stock # | Size (W x L) (in.) | Radius (in.) | Weight/100 (lbs) | Material | Compatibility |
|---|---|---|---|---|---|
| J5122 | 2-3/4 x 3 | 1-9/16 | – | High-grade white electrical porcelain (dry process) | J513_A series hooks |
| U604 | – | – | 168 | High-grade white electrical porcelain (dry process) | U670_ and U602/U603 series hooks |
| U604C | – | – | 140 | High-grade white electrical porcelain (dry process) | U670_ and U602/U603 series hooks |
| U604AWD | – | – | – | High-grade white electrical porcelain (dry process) | U670_ and U602/U603 series hooks |
Frequently Asked Questions (FAQS)
What are underground cable insulators used for?
Underground cable insulators are designed to rest on cable rack hooks and provide a smooth, generous radius seat for underground cables. They minimize cable tilling, swaying, or drooping and are commonly employed in manholes, cable trenches, or substations for cable mounting and guide support.
What material are the insulators made from, and why?
The insulators are made from high-grade white electrical porcelain, manufactured using the dry process for enhanced durability and performance. Porcelain offers a smooth radius seat, is highly resistant to chipping or breakage, has no sharp edges or corners, and helps minimize cable movement, ensuring long-term reliability. A white glaze is standard, with blown glaze available upon request.
How do the insulators prevent cable damage?
By providing a generous radius seat and smooth surface, the insulators reduce stress on cables, preventing issues like tilling, swaying, or drooping that could lead to damage or failure.
What types of cable rack hooks are they compatible with?
These insulators accommodate J513_A series hooks (e.g., model J5122) and are designed to engage onto U670_ and U602/U603 series hooks (e.g., models U604, U604C, and U604AWD), ensuring secure fit and support. This precise compatibility minimizes installation issues and ensures reliable cable support, backed by RaxPower's use of automatic machines for accurate sizing and uniform product quality.
How many insulator models are available for different project needs?
RaxPower provides one of the most comprehensive lines of cable rack insulators with over 50 different models available, including various sizes, lengths, and widths to accommodate diverse cable dimensions and installation requirements. The range also includes galvanized steel mounting hardware for efficient installation, ensuring we can meet the needs of major projects, from utility expansions to renewable energy connections, with consistent quality and on-time delivery.
How does RaxPower ensure quality and compliance?
RaxPower employs strict quality control, including raw material selection and multi-stage testing, to guarantee 100% quality and compliance with industry standards. This rigorous process ensures durable performance and long-term reliability.
What applications and industries are these insulators suitable for?
RaxPower's cable rack insulators are ideal for electrical distribution, renewable energy, and railway electrification. They perform reliably in demanding environments such as manholes, cable trenches, and substations, withstanding harsh conditions in both wet and dry locations thanks to their resistance to environmental stressors.
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