P-20T Pin-Type Insulators — 20kV Porcelain Pin Insulator | GB Standard Compliant
The P-20T Pin-Type Insulators are 20kV-class porcelain pin insulator designed and manufactured by BONLE (FUJIAN) INSULATOR CO., LTD. in compliance with Chinese GB standards for overhead distribution line insulation.
It is part of the P-series pin insulator family (P-6T, P-10T, P-15T, P-20T, P-35T) widely used across Asia, Africa, and South America.
The insulator is constructed with a high-strength ceramic body and a hot-dip galvanized steel pin, with the ceramic and steel components cemented together using silicate cement adhesive.
The product is available with either brown or gray glaze finish and is suitable for 20kV nominal voltage distribution systems, offering reliable electrical insulation and mechanical support for conductors on cross-arms.
Explore related products: P-6T Pin Type Insulator (6kV) | P-10T Pin Type Insulator (10kV) | P-15T Pin Type Insulator (15kV) | P-35T Pin Type Insulator (35kV) | PQ Series Heavy Pollution Pin Insulators
P-20T Pin-Type Insulators Technical Specifications
Dimensions
| Parameter | Value |
| Diameter (D) | 228 mm |
| Height (H) | 165 mm |
| Creepage Distance | 370 mm |
| Connection Type | Standard threaded steel pin (exact thread size available upon request) |
Mechanical Performance
| Parameter | Value |
| Cantilever Strength | 13 kN |
Electrical Performance
| Parameter | Value |
| Typical Application Voltage | 20 kV |
| Power Frequency Dry Withstand Voltage | 80 kV |
| Power Frequency Wet Withstand Voltage | 50 kV |
| Dry Lightning Impulse Withstand Voltage | 110 kV |
| Power Frequency Puncture Voltage | 110 kV |
Radio Influence Voltage (RIV) Data
| Parameter | Value |
| Test Voltage RMS to Ground | 22 kV |
| Maximum RIV at 1000 kHz | 100 μV |
Packing & Shipping
| Parameter | Value |
| Net Weight, Approximate | 5.5 kg |
| Standard Packing | Wooden case / pallet (export packaging) |
P-20T Pin-Type Insulators Standards Compliance
The P-20T Pin-Type Insulators conform to applicable Chinese national GB standards for its voltage class. The P-series is commonly manufactured and tested in accordance with GB/T 1001.1 (Insulators for overhead lines with a nominal voltage above 1,000V — Part 1: Ceramic or glass insulator units for a.c. systems — Definitions, test methods and acceptance criteria).
The current active version of this standard is GB/T 1001.1-2021, which specifies the test methods and acceptance criteria for porcelain insulator units used on AC overhead power lines and traction lines with nominal voltages above 1,000V and frequencies not exceeding 100Hz.
For pin insulators specifically, GB/T 1000-2016 covers the dimensions and characteristics of high-voltage line pin-type porcelain insulators for nominal voltages up to 10kV. For 20kV-class pin insulators such as the P-20T, production follows applicable GB standard requirements, customer-approved drawings, and equivalent IEC test methodology. Please contact the manufacturer for the exact standard edition and certificate applicable to your order.
The RIV testing requirements are also addressed in IEC 60383-1:2023, Clause 14. For post insulator testing methodology applicable to pin-type insulators, IEC 60168:1994 covers indoor and outdoor post insulators of ceramic material for systems with nominal voltages greater than 1,000V.
P-20T Pin-Type Insulators Applications
The P-20T Pin-Type Insulators are primarily designed for 20kV overhead distribution lines, where it serves to both support conductors and provide electrical insulation between the conductor and the grounded crossarm. Typical applications include:
- Distribution networks – Medium-voltage overhead distribution lines in urban and rural areas
- Pole-mounted installations – Cross-arm mounting on wooden or concrete poles
- Substation connections – Insulation for incoming and outgoing distribution feeders
- Traction lines – Applicable for AC overhead traction line insulation within its voltage class
The pin-type design allows the conductor to be secured in the top groove or side groove of the insulator head, making it suitable for straight-line and small-angle pole configurations. The threaded steel pin provides secure attachment to compatible cross-arm hardware.
P-20T Pin-Type Insulators Quality Assurance & Testing
Each P-20T Pin-Type Insulators undergo rigorous testing protocols in accordance with applicable GB standards, including:
- Power frequency dry and wet withstand voltage tests – Verifying insulation integrity under dry and rainy conditions
- Lightning impulse withstand voltage test – Confirming surge protection capability
- Power frequency puncture voltage test – Ensuring the ceramic body will not puncture under sustained overvoltage
- Radio influence voltage (RIV) measurement – Controlling corona discharge to within acceptable limits for communication interference
- Cantilever strength test – Validating mechanical load-bearing capacity
The 13kN cantilever strength rating provides a safety margin for conductor tension, wind loading, and ice loading conditions typical of distribution line installations.
Related reading: High Voltage Insulator Testing Methods | Understanding RIV in Distribution Insulators
P-20T Pin-Type Insulators Packing, Shipping & Export Information
| Parameter | Details |
| Net Weight (each) | ~5.5 kg |
| Standard Export Packing | Wooden case or palletized |
| HS Code | Available upon request |
| Port of Loading | Available upon request / main Chinese ports |
| Export Markets | Asia, Africa, South America, Middle East, Europe, North America |
Chinese pin insulator manufacturers routinely export to over 50 countries, with established distribution channels in North America, Europe, and emerging markets. Products are typically shipped in wooden cases or on pallets with appropriate cushioning to prevent breakage during transit.
Why Choose the P-20T Pin-Type Insulators?
- GB standard compliant – Manufactured and tested to Chinese national standards, with equivalent IEC test methodology
- Proven design – Part of the P-series family with decades of field deployment in distribution networks worldwide
- Reliable mechanical performance – 13kN cantilever strength suitable for standard distribution line tensions
- Excellent electrical characteristics – 80kV dry / 50kV wet power frequency withstand, 110kV BIL
- Low RIV – 100μV maximum at 1000 kHz, minimizing communication interference
- Export-ready – Standardized dimensions, ISO-certified production, and established international shipping logistics
P-20T Pin-Type Insulators FAQ
Q: What is the difference between P-20T and P-15T pin insulators?
A: The primary difference is the rated voltage — P-20T is rated for 20kV systems while P-15T is rated for 15kV systems. The P-20T typically has larger dimensions and higher electrical withstand values.
Q: Is the P-20T pin insulator available in composite (polymer) material?
A: The P-20T is a traditional porcelain pin insulator. For composite polymer alternatives in the 20kV class, consider the FPQ series composite pin insulators, which offer lighter weight and enhanced pollution resistance.
Q: What pin thread size does the P-20T use?
A: The P-20T uses a standard threaded steel pin. Exact thread size is available upon request and can be confirmed according to cross-arm mounting hardware requirements.
Q: Can the P-20T be used in highly polluted environments?
A: For heavily polluted areas, the PQ-20T heavy-pollution type pin insulator is recommended, which features an extended creepage distance for improved contamination performance.
Q: What is the creepage distance of the P-20T?
A: The creepage distance is 370 mm.
Q: What is the cantilever strength of the P-20T?
A: The cantilever strength is 13 kN.
Q: What is the net weight of the P-20T?
A: The approximate net weight is 5.5 kg.
Q: What glaze colors are available?
A: The P-20T is available in brown or gray glaze.
Q: Does the P-20T comply with GB Standard?
A: Yes, it complies with applicable GB Standard requirements for its voltage class.
About This P-20T Pin-Type Insulators Product Page
This specification page provides technical data for the P-20T Pin Type Insulator manufactured to GB standard. All dimensions, mechanical values, and electrical ratings are typical values for standard production units. For custom requirements, OEM specifications, or bulk quotations, please contact the manufacturer or authorized distributor directly.
Last updated: September 2026
Related P-20T Pin-Type Insulators Standards & Resources
P-20T Pin-Type Insulators External links:
- GB/T 1001.1-2021 – Insulators for overhead lines above 1,000V (Chinese National Standard) – Official standard information from China’s State Administration for Market Regulation: https://openstd.samr.gov.cn/
- IEC 60383-1:2023 – Insulators for overhead lines with nominal voltage above 1,000V – International Electrotechnical Commission official standard: https://www.iec.ch/
- IEC 60168:1994 – Tests on indoor and outdoor post insulators of ceramic material – IEC standard for ceramic insulator testing: https://webstore.iec.ch/
- China Chamber of Commerce for Import and Export of Machinery and Electronic Products – Verified Chinese insulator manufacturers and exporters directory: https://www.cccme.org.cn/
P-20T Pin-Type Insulators Internal links:
- P-6T Pin Type Insulator (6kV): https://www.tcinsulators.com/p-6t-pin-type-insulator/
- P-10T Pin Type Insulator (10kV): https://www.tcinsulators.com/p-10t-pin-type-insulator/
- P-15T Pin Type Insulator (15kV): https://www.tcinsulators.com/p-15t-pin-type-insulator/
- P-35T Pin Type Insulator (35kV): https://www.tcinsulators.com/p-35t-pin-type-insulator/
- PQ Series Heavy Pollution Pin Insulators: https://www.tcinsulators.com/pq-series-heavy-pollution-pin-insulators/
- All Pin Type Insulators: https://www.tcinsulators.com/pin-type-insulators/
- High Voltage Insulators: https://www.tcinsulators.com/high-voltage-insulators/
- Contact us: https://www.tcinsulators.com/contact/
- Request a quote: https://www.tcinsulators.com/request-a-quote/
