H1: ANSI 57-25 Line Post Insulator Horizontal Clamp Top Cup Base Type — 12.5kN Porcelain Line Post Insulator for Distribution Lines
The ANSI 57-25 Line Post Insulator Horizontal Clamp Top Cup Base Type is a solid-core porcelain line post insulator designed for mechanical support and electrical insulation of conductors in overhead power distribution lines.
Manufactured in strict accordance with ANSI Standard, this insulator provides reliable performance for distribution applications with a typical application voltage of 66kV.
The horizontal clamp top cup base design features a clamp top for secure conductor mounting and a cup base for versatile installation, ensuring easy installation and stable performance under extreme temperature cycling. The glaze color is available in brown or light gray.
Whether used in crossarm-mounted distribution lines, pole-top structures, or dead-end and angle applications, the ANSI 57-25 Line Post Insulator Horizontal Clamp Top Cup Base Type offers a cost-effective and durable solution for modern distribution infrastructure.
H2: ANSI 57-25 Line Post Insulator Horizontal Clamp Top Cup Base Type Technical Specifications
The ANSI 57-25 Line Post Insulator Horizontal Clamp Top Cup Base Type features a cantilever strength of 2,800 lbs (12.5kN), making it ideal for line post applications in distribution networks.
Key electrical, mechanical, and dimensional ratings are detailed below:
| S/N | Technical Standard Particulars/Details | Brown (57-25B) | Light Gray (57-25G) |
| 1 | Product Item No./SKU Code | 57-25B | 57-25G |
| 2 | Glaze Color | Brown | Light Gray |
| 3 | Standard | ANSI | ANSI |
| 4 | Type / Mounting | Horizontal Clamp Top Cup Base Type | Horizontal Clamp Top Cup Base Type |
| 5 | Diameter (D) | 7 1/2 Inches (190 mm) | 7 1/2 Inches (190 mm) |
| 6 | Height (H) | 22 3/8 Inches (568 mm) | 22 3/8 Inches (568 mm) |
| 7 | Leakage Distance | 45 Inches (1145 mm) | 45 Inches (1145 mm) |
| 8 | Dry Arcing Distance | 17 1/4 Inches (438 mm) | 17 1/4 Inches (438 mm) |
| 9 | Cantilever Strength | 2,800 Pounds (12.5 kN) | 2,800 Pounds (12.5 kN) |
| 10 | Cantilever Strength Routine Test | 1,000 Pounds (5 kN) | 1,000 Pounds (5 kN) |
| 11 | Typical Application Voltage | 66 kV | 66 kV |
| 12 | Low Frequency Dry Flashover Voltage | 175 kV | 175 kV |
| 13 | Low Frequency Wet Flashover Voltage | 150 kV | 150 kV |
| 14 | Critical Impulse Flashover Voltage, Positive | 290 kV | 290 kV |
| 15 | Critical Impulse Flashover Voltage, Negative | 380 kV | 380 kV |
| 16 | Radio Influence Voltage – Test Voltage RMS to Ground | 44 kV | 44 kV |
| 17 | Radio Influence Voltage – Maximum RIV at 1000 kHz | 200 μV | 200 μV |
| 18 | Net Weight (approx.) | 19.5 kg | 19.5 kg |
| 19 | Applicable Standard | ANSI | ANSI |
Material: Manufactured from high-grade wet-process porcelain per ANSI requirements.
Mounting: Horizontal clamp top cup base type design.
H2: Material & Construction
Every unit of the ANSI 57-25 Line Post Insulator Horizontal Clamp Top Cup Base Type is made from high-grade wet-process porcelain, fired at high temperature to achieve maximum density and near-zero porosity. The solid-core line post design ensures easy handling and reliable performance under extreme thermal cycling.
The hard, glossy glaze coating offers good self-cleaning properties, reducing maintenance frequency. The horizontal clamp top cup base design provides secure conductor mounting and flexible installation for overhead distribution lines.
Metal parts are made of galvanized malleable iron, ductile iron, steel, or aluminum, with ferrous parts hot-dip galvanized per applicable standards.
Both brown and light gray glaze colors are available. For more on porcelain manufacturing standards, visit the American National Standards Institute (ANSI): https://www.ansi.org
H2: ANSI 57-25 Line Post Insulator Horizontal Clamp Top Cup Base Type Applications & Installation
The ANSI 57-25 Line Post Insulator Horizontal Clamp Top Cup Base Type is widely used in overhead power distribution lines, typically installed on crossarms and pole-mounted structures. It is ideal for:
- Overhead distribution line conductor support
- Crossarm-mounted applications
- Pole-top structures
- Dead-end and angle applications in distribution networks
- Horizontal clamp top conductor mounting with cup base
The horizontal clamp top cup base design allows easy mounting and secure conductor clamping. Explore our full range of line post insulators: https://www.tcinsulators.com/products/line-post-insulators/ and transmission hardware for more options.
H2: ANSI 57-25 Line Post Insulator Horizontal Clamp Top Cup Base Type Quality & Performance Advantages
Compared to polymer alternatives, porcelain offers unmatched resistance to UV radiation, bird pecking, and scratch damage. Its glaze reduces continuous water film formation, significantly raising pollution flashover voltage.
Moreover, the ANSI 57-25 Line Post Insulator Horizontal Clamp Top Cup Base Type requires minimal routine maintenance and delivers a service life of over 30 years under normal operating conditions. Full testing procedures are detailed in ANSI standards, published by the American National Standards Institute.
Every unit undergoes 100% routine electrical and mechanical testing before dispatch, including visual inspection, dimensional checks, mechanical load tests, and high-voltage withstand tests. Design tests — such as low frequency dry flashover, low frequency wet flashover, critical impulse flashover, radio influence voltage, and thermal shock — are performed per ANSI standards on new designs.
Quality conformance tests including porosity, galvanizing, and cantilever-strength tests are conducted on each lot. Full test reports and traceability records are provided for each batch. For installation guidance, refer to our insulator string assembly guide: https://www.tcinsulators.com/insulator-manufacturer-5/
H2: Packing & Shipping
Each insulator is individually packed with foam cushioning and secured in sturdy cartons to prevent transit damage. We offer flexible shipping options (FOB, CIF, EXW) with lead times of 15-30 days depending on order quantity.
For detailed datasheets, CAD drawings, or competitive pricing on the ANSI 57-25 Line Post Insulator Horizontal Clamp Top Cup Base Type, please contact our sales team via the inquiry form below. We also offer OEM services and free technical consultation for distribution line design.
H2: Why Choose Our ANSI 57-25 Line Post Insulator Horizontal Clamp Top Cup Base Type
When selecting an ANSI 57-25 Line Post Insulator Horizontal Clamp Top Cup Base Type for your distribution project, quality and reliability are paramount. Our ANSI 57-25 Line Post Insulator Horizontal Clamp Top Cup Base Type is subject to strict quality control at every production stage — from raw material inspection to final electrical testing.
We understand that distribution line outages are costly, which is why each ANSI 57-25 Line Post Insulator Horizontal Clamp Top Cup Base Type is designed for long-term durability. With years of experience in porcelain insulator manufacturing, we provide competitive pricing, fast delivery, and dedicated technical support.
Whether you need a small sample batch or a full container order, our ANSI 57-25 Line Post Insulator Horizontal Clamp Top Cup Base Type is available with short lead times. Contact us today to learn how the ANSI 57-25 Line Post Insulator Horizontal Clamp Top Cup Base Type can enhance your distribution grid reliability.
Internal Links
ANSI 57-25 Line Post Insulator Horizontal Clamp Top Cup Base Type:
Line Post Insulators: https://www.tcinsulators.com/products/line-post-insulators/
Contact TC Insulators: https://www.tcinsulators.com/contact/
Insulator String Assembly Guide: https://www.tcinsulators.com/insulator-manufacturer-5/
External Links
TC Insulators Official Website: https://www.tcinsulators.com
American National Standards Institute (ANSI): https://www.ansi.org
