P-20T Pin Type Insulator — 20kV Porcelain Pin Insulator | GB Standard Compliant

The P-20T Pin Type Insulator is a 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 Insulator 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 Insulator Standards Compliance

The P-20T pin insulator conforms 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.

Applications

The P-20T pin insulator is 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 Insulator Quality Assurance & Testing

Each P-20T insulator undergoes 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 Insulator 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 Insulator?

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

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 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 Standards & Resources

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/

Internal links: