SLP/22/420 Pin-Type Insulator Porcelain – AS 4899 Compliant for 22kV Overhead Power Lines
The SLP/22/420 Pin-Type Insulator Porcelain is a robust and dependable solution for insulation and conductor support in 22kV overhead transmission and distribution lines.
Manufactured to meet AS 4899‑2007 (Pin insulators — Porcelain and glass for overhead power lines — Voltages greater than 1000 V a.c.) standard requirements, the SLP/22/420 insulator ensures seamless integration into power networks across Australia, New Zealand, and other markets that follow Australian Standards.
The SLP/22/420 features a durable glazed porcelain finish (available in brown, grey, or white), providing excellent weather resistance and long-term durability in outdoor environments. With its standard shed profile design, this insulator offers good self‑cleaning properties, reliable pollution performance, exceptional mechanical strength, and competitive cost.
SLP/22/420 Pin-Type Insulator Porcelain – AS 4899 Designation Breakdown
The designation SLP/22/420 follows the AS 4899 coding system:
| Code | Meaning |
| S | Standard shed profile |
| LP | Line Pin |
| 22 | Typical operating voltage (22 kV) |
| 420 | Nominal minimum creepage distance (420 mm) |
SLP/22/420 Pin-Type Insulator Porcelain – AS 4899 Technical Specifications
| Parameter | Value |
| Model | SLP/22/420 |
| Standard | AS 4899‑2007 |
| Figure Number | 2.4 (per AS 4899) |
| Typical Application Voltage | 22 kV |
| Height (H) | 200 mm |
| Diameter (D) | 160 mm |
| Nominal Minimum Creepage Distance | 420 mm |
| Dry Arcing Distance | 200 mm |
| Lightning Impulse Withstand Voltage | 145 kV |
| Wet Power Frequency Withstand Voltage | 50 kV |
| Power Frequency Puncture Voltage | 130 kV |
| Minimum Bending Failing Load | 11 kN |
| Thread Pattern | C (round‑thread form) |
| Recommended Pin Type | C/200/11 |
| Head Type | Type 2 (per Figure 2.13 of AS 4899) |
| Designation / Identification | 420S11 |
| Number of Sheds | 3 |
| Colour | Brown, grey, or white |
| Approximate Net Weight | 4.5 kg (typical) |
Note: The values for lightning impulse withstand voltage (145 kV) and wet power frequency withstand voltage (50 kV) are specified in Table 2.1 of AS 4899‑2007. The height (200 mm) and diameter (160 mm) are sourced from product catalogues compliant with this standard.
SLP/22/420 Pin-Type Insulator Porcelain – AS 4899 Key Features
Superior Electrical Performance – The SLP/22/420 insulator delivers reliable electrical performance for 22kV systems, with a nominal minimum creepage distance of 420 mm that effectively increases leakage distance and reduces the risk of pollution flashover, guaranteeing safe operation of 22kV lines even under rain, fog, and contaminated conditions.
High Mechanical Strength – With a minimum bending failing load of 11 kN, the insulator reliably withstands conductor tension, wind loads, and ice accretion, ensuring long‑term stability in overhead line installations.
Standard Shed Profile – The “S” (standard) profile provides good self‑cleaning properties and is suitable for general outdoor applications in non‑heavy pollution areas.
Simple Structure, Easy Installation – The pin‑type insulator features a one‑piece porcelain body designed for convenient mounting on standard pins (recommended type C/200/11). The conductor is secured in the side groove or on the neck of the insulator using standard binding methods.
Glazed Porcelain Finish – The insulator features a durable glaze coating (available in brown, grey, or white) that provides excellent weather resistance, UV protection, and self‑cleaning properties, ensuring long‑term performance in harsh outdoor environments.
Reliable Design – Engineered for long‑term reliable operation with minimal maintenance requirements – regular visual inspections and cleaning are typically sufficient to ensure continued performance.
SLP/22/420 Pin-Type Insulator Porcelain – AS 4899 Application Scenarios
The SLP/22/420 high‑voltage pin‑type insulator is ideal for:
- Insulation and conductor support in 22kV overhead distribution and transmission lines
- Outdoor installations with exposure to all atmospheric factors
- AC overhead power lines with frequencies not exceeding 100 Hz
- Power distribution networks in normal environmental conditions
- Installation on wooden, reinforced concrete, and metal poles
- Medium voltage distribution networks in Australia, New Zealand, and other AS‑standard markets
- Mounting options – can be used vertically or horizontally
SLP/22/420 Pin-Type Insulator Porcelain – AS 4899 Standards Compliance
| Standard | Description |
| AS 4899‑2007 | Pin insulators — Porcelain and glass for overhead power lines — Voltages greater than 1000 V a.c. |
| AS/NZS 2947.1 | Test methods — Insulator units |
| AS 1824.1 | Insulation co‑ordination — Definitions, principles and rules |
| AS 4436 | Guide for the selection of insulators in respect of polluted conditions |
| AS 1154.1 | Insulator and conductor fittings for overhead power lines – Performance, material, general requirements and dimensions |
SLP/22/420 Pin-Type Insulator Porcelain – AS 4899 Recommended Pin Type – C/200/11
The SLP/22/420 insulator is designed to be used with pin type C/200/11 per AS 4899. Pin specifications are as follows:
| Parameter | Value |
| Pin Type Reference | C/200/11 |
| Head Pattern | C |
| Cantilever Minimum Failing Load | 11 kN |
| Shank Diameter | 24 mm |
| Shank Length | 165 mm |
| Thread Length (minimum) | 80 mm |
| Minimum Collar Diameter | 65 mm |
| Stem Length | 200 mm |
The pin is supplied complete with one galvanized nut and one galvanized washer, and is forged from steel with a minimum tensile strength of 470 MPa. The head thread conforms to the basic round‑thread form (Pattern C) per Appendix B of AS 4899.
Why Choose SLP/22/420 Pin-Type Insulator Porcelain – AS 4899 for Your Power Grid?
- Full AS compliance – meets AS 4899‑2007 standard, ensuring smooth acceptance by grid operators and regulatory bodies in Australia and New Zealand
- Standard profile design – good self‑cleaning properties for reliable performance in normal environments
- Proven reliability – engineered with high mechanical strength (11 kN bending failing load) and robust electrical performance (145 kV impulse withstand)
- Pollution‑resistant design – 420 mm creepage distance ensures reliable operation in normal to moderately contaminated environments
- Weather‑resistant – glazed porcelain finish provides excellent weather resistance and UV protection
- Cost‑effective – high performance at competitive pricing, reducing total project costs
- Versatile – suitable for 22kV applications and available in brown, grey, or white
About the SLP/22/420 Pin-Type Insulator Porcelain – AS 4899 Manufacturer
The SLP/22/420 Pin-Type Insulator Porcelain is manufactured by one leading Chinese insulator manufacturer Bonle (Fujian) Insulator Co., Ltd. with decades of experience in power line products. This manufacturer holds ISO 9001 certification and produces insulators in accordance with IEC, ANSI, ASTM, AS, BS, DIN, and ISO standards. All products undergo rigorous electrical and mechanical testing before shipment, ensuring the highest quality standards.
Model: SLP/22/420 | Standard: AS 4899‑2007 | Rated Voltage: 22 kV | Creepage Distance: 420 mm
SLP/22/420 Pin-Type Insulator Porcelain – AS 4899 References & Authoritative Resources
For certification, standard compliance, and procurement specifications, refer to:
- AS 4899‑2007 – Pin insulators — Porcelain and glass for overhead power lines — Voltages greater than 1000 V a.c.
- AS/NZS 2947.1 – Test methods — Insulator units
- AS 4436 – Guide for the selection of insulators in respect of polluted conditions
- Full Range of Pin Insulators – explore our complete product portfolio for transmission and distribution lines
This page is optimized for search engines with relevant keywords for the power equipment market.
