Spool insulators, known in industry slang as pineapples, dead-end or support secondary voltage conductors in electrical utility applications. Used with spool bolts, clevises, and secondary racks, these components accommodate conductors through their grooved exterior and central mounting hole, enabling secure attachment in both horizontal and vertical positions on utility neutral and secondary lines.
Wet-process porcelain construction provides resistance to moisture, corrosion, and chemicals through a vitrified and glazed surface. The thoroughly mixed and fired porcelain prevents fractures or glaze imperfections, with a sound, smoothly finished body ensuring long-term reliability in overhead power distribution systems.
Technical specifications comply with American National Standards Institute (ANSI) C29.5 and class designations 53-1, 53-2, and 53-3. Minimum ultimate tensile strengths range from 2000 to 3000 pounds depending on model. Low frequency dry flashover voltages span 20 to 35 kilovolts, while wet flashover performance varies from 8 to 18 kilovolts vertically and 10 to 25 kilovolts horizontally. Standardized dimensions include heights from 54 to 105 millimeters, diameters from 57 to 105 millimeters, and an 18-millimeter central hole diameter for mounting hardware compatibility. Weights range from approximately 0.2 to 1.2 kilograms per unit.
Spool Insulator Wholesaler with Over 21 Years of Experience
Introducing RaxPower, a leading manufacturer of porcelain spool insulators for electrical transmission and distribution lines. Established in 2003 in Hebei Province, China, RaxPower has over 21 years of manufacturing and exporting experience, with 17,000 square meters of production workshops and state-of-the-art facilities.
Our factory employs skilled technicians and advanced machinery to produce high-quality porcelain spool insulators with precision and attention to detail. We utilize superior porcelain materials to ensure the durability, reliability, and resistance to wear and tear of our spool insulators, which are carefully tested to meet strict quality standards, including ISO and CE certifications.
These insulators are widely used in overhead power lines, electrified railway systems, and low voltage distribution networks, designed to withstand harsh environmental conditions like extreme temperatures and pollution.
Committed to product excellence and customer satisfaction, RaxPower focuses on quality, reliability, and performance, making us your trusted partner for porcelain spool insulators that meet the demands of modern electrical systems. Contact us today to learn more about our products and services.
| Parameter | 53-1 | 53-2 | 53-3 | 53-4 | 53-5 |
|---|---|---|---|---|---|
| Material | Wet-process Porcelain | Wet-process Porcelain | Wet-process Porcelain | Wet-process Porcelain | Wet-process Porcelain |
| Standard | ANSI C29.5 | ANSI C29.5 | ANSI C29.5 | ANSI C29.5 | ANSI C29.5 |
| Ultimate Tensile Strength (lb) | 2000 | 3000 | 4000 | 4500 | 6000 |
| Low Frequency Dry Flashover Voltage (kV) | 20 | 25 | 25 | 25 | 35 |
| Low Frequency Wet Flashover Voltage – Vertical (kV) | 8 | 12 | 12 | 12 | 18 |
| Low Frequency Wet Flashover Voltage – Horizontal (kV) | 10 | 15 | 15 | 15 | 25 |
| Height (mm) | 54 | 76 | 81 | 76 | 105 |
| Diameter (mm) | 57 | 79 | 76 | 105 | 102 |
| Neck Diameter (mm) | 45 | 45 | 45 | 73 | 73 |
| Hole Diameter (mm) | 18 | 18 | 18 | 18 | 18 |
| Wire Grooves Radius (mm) | 11 | 18 | 11 | 16 | 11 |
| Net Weight (kg) | 0.2 | 0.55 | 0.6 | 1.1 | 1.16 |
| Carton Quantity | 100 | 100 | 100 | 100 | 100 |
| Pallet Quantity | 3600 | 3600 | 3600 | 3600 | 3600 |
Frequently Asked Questions (FAQS)
What are spool insulators and what are they used for?
Spool insulators are porcelain components used with spool bolts (upset bolts), clevises, and secondary racks for dead-ending or supporting secondary voltage conductors in low voltage distribution networks and utility neutral applications. They are constructed from wet-process porcelain, which provides durability and resistance to environmental conditions.
What industry standards and certifications do your spool insulators meet?
Our spool insulators comply with ANSI specifications such as C29.5 and are available in ANSI classes including 53-1, 53-2, and 53-3. They hold certifications including ISO, CE, BV, and SGS, with strict quality control measures and multi-stage testing to ensure reliability. A 1-year warranty is provided.
What are the mechanical and electrical specifications?
Tensile strength varies by model from 2000 lbs to 3000 lbs, with some models supporting up to 4000 lbs maximum transverse load. Dry flashover voltages range from 20 kV to 35 kV, while wet flashover voltages are typically 8 kV to 18 kV vertically and 10 kV to 25 kV horizontally. Typical dimensions include sizes around 3 inches in height, diameter, and length, with weights approximately 0.5 lbs to 1.19 lbs, though specifications vary by model.
What is your lead time for large project orders?
Standard models are kept in stock, and for large orders, we typically deliver within approximately 15 days. We use automated processes and efficient inventory management to ensure on-time delivery for all project sizes.
Do you offer custom manufacturing or OEM services?
Yes, we provide OEM services and can customize spool insulators according to your specifications, including sizes, colors, and other details to meet unique project needs.
Can I obtain samples for evaluation before placing a bulk order?
Yes, we offer free samples. Please contact us to discuss the sample policy and your specific requirements for product evaluation.
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