H1: AS GY Series Stay Insulators — Porcelain GY‑1 to GY‑4 for Guy Wire Insulation in Overhead Lines
The AS GY Series Stay Insulators comprises four classes of wet‑process porcelain stay insulators — GY‑1, GY‑2, GY‑3, and GY‑4.
These are specifically engineered for insulating guy wires (stay wires) in overhead power distribution and transmission lines.
Manufactured in compliance with Australian Standard (AS) requirements, these insulators are designed to prevent leakage current from flowing through guy wires to the ground.
This ensures the safety of personnel and animals near poles and towers.
Also known as guy insulators or egg insulators due to their distinctive shape, the GY Series features two perpendicular holes.
These holes accommodate guy grips or wire ropes in opposite directions, providing a secure mechanical connection while maintaining electrical insulation.
With mechanical failing loads ranging from 27kN to 222kN and wet withstand voltages from 10kV to 30kV, the GY Series offers reliable performance for low to medium voltage applications from 0.4kV to 33kV.
H2: AS GY Series Stay Insulators Technical Specifications (GY‑1 to GY‑4)
The following table summarizes all key dimensional, electrical, and mechanical parameters for each class, as per Australian Standard (AS) and BS 137.
| Parameter | Unit | GY-1 | GY-2 | GY-3 | GY-4 |
| AS Class | — | J-2.7 | J-7 | J-16 | J-16B |
| Figure No. | — | 1 | 2 | 3 | 4 |
| Height (H) | mm | 90 | 146 | 216 | 280 |
| h (Hole Center Spacing) | mm | 48 | 73 | 89 | 89 |
| h₁ (Height to Hole) | mm | 60 | 99 | 133 | 165 |
| D (Outer Diameter) | mm | 68 | 73 | 115 | 115 |
| d (Inner Diameter) | mm | 40 | 44 | 67 | 67 |
| d₁ (Cable Hole Diameter) | mm | 16 | 22 | 38 | 38 |
| Wet Power Frequency Withstand Voltage | kV | 10 | 15 | 20 | 30 |
| Stand or Wire Rope Diameter | mm | 7/2.75 | 19/2.00 | 19/2.75 | 19/2.75 |
| Mechanical Failing Load | kN | 27 | 71 | 222 | 222 |
| Net Weight (approx.) | kg | 0.6 | 1.1 | 4.3 | 5.7 |
All models: Compliant with AS (Australian Standard) and BS 137 | Glaze: Brown / Grey | Wet‑process porcelain
H2: AS GY Series Stay Insulators Material & Construction
Every insulator in the AS GY Series is manufactured from high‑grade electrical porcelain using the wet‑process method.
It is fired at high temperatures to ensure maximum density, mechanical strength, and near‑zero porosity.
The porcelain body is protected by a smooth, hard‑glaze coating, available in brown or grey.
This coating provides excellent resistance to tracking, UV radiation, and environmental degradation.
The distinctive egg‑shaped design features two holes arranged at right angles to each other.
This allows guy grips or wire ropes to pass through in opposite directions for secure mechanical fastening.
The robust construction ensures a service life exceeding 40 years under normal operating conditions, with minimal maintenance required.
For more on porcelain manufacturing standards, visit the International Electrotechnical Commission (IEC).
H2: AS GY Series Stay Insulators Applications & Installation
The GY Series stay insulators are the preferred choice for:
- Guy wire insulation on overhead distribution and transmission lines (0.4 kV to 33 kV)
- Dead‑end pole counterweighting and terminal pole stabilization
- Rural electrification networks and railway overhead line systems
- Medium and low voltage line applications requiring reliable guy wire insulation
Installation is straightforward.
Two pieces of guy grips or wire ropes pass through the two perpendicular holes in the insulator body in opposite directions.
This provides a secure mechanical connection.
The insulator is installed in the stay wire structure to balance tension strength while providing electrical insulation.
Its compact design and standardized dimensions ensure easy integration with existing guy wire hardware.
Standard working conditions include ambient temperatures from -40°C to +40°C and altitudes not exceeding 1,000metres.
Explore our full range of suspension insulators and transmission hardware for more options.
H2: AS GY Series Stay Insulators Quality & Performance Advantages
- Progressive Mechanical Strength
Mechanical failing load ranges from 27 kN (GY-1) to 222 kN (GY-3 and GY-4).
This allows precise matching to line tension requirements. - Superior Electrical Insulation
Wet power frequency withstand voltage increases from 10 kV (GY-1) to 30 kV (GY-4).
This ensures reliable insulation under rain, fog, and high‑humidity conditions. - Robust Porcelain Construction
Wet‑process porcelain offers excellent resistance to UV radiation, bird pecking, and mechanical impact.
Service life exceeds 40 years. - Versatile AS Class Compatibility
Available in AS Classes J‑2.7, J‑7, J‑16, and J‑16B.
This ensures compliance with Australian and international (BS) standards. - Low Maintenance
The hard‑glaze coating provides self‑cleaning properties.
This reduces maintenance frequency and lifecycle costs.
Each insulator undergoes 100% routine electrical and mechanical testing before dispatch.
Tests include visual inspection, dimensional checks, mechanical load tests, and high‑voltage withstand tests.
Design tests per AS/BS standards cover mechanical failing load, wet withstand voltage, and thermal‑mechanical performance.
Full test reports and batch traceability are provided.
Full testing procedures are detailed in the relevant AS/BS standards, published by NEMA (for cross‑reference) and other international bodies.
Each insulator is individually packed with foam cushioning and secured in sturdy wooden crates or corrugated 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 installation guidance, refer to our insulator string assembly guide.
H2: AS GY Series Stay Insulators Selection Recommendations
| Application Environment | Recommended Model(s) | Key Selection Criteria |
| Low voltage distribution / light tension | GY-1 (J-2.7) | Lightweight (0.6kg), compact size, 27kN mechanical load, 10 kV wet withstand |
| Medium voltage lines / moderate tension | GY-2 (J-7) | 71kN mechanical load, 15kV wet withstand, 1.1kg weight |
| High tension applications / heavy load | GY-3 (J-16) | 222kN mechanical load, 20kV wet withstand, large diameter (115 mm) |
| Maximum tension / severe conditions | GY-4 (J-16B) | 222kN mechanical load, 30kV wet withstand, highest insulation performance |
For detailed datasheets, CAD drawings, or competitive pricing on any AS GY Series Insulator, please contact our sales team via the inquiry form below.
We also offer OEM services and free technical consultation for guy wire insulation design.
H2: AS GY Series Stay Insulators References & Authoritative Resources
For detailed certification, standard compliance, and procurement specifications, please refer to the following sources:
- International Electrotechnical Commission (IEC) – Global standards for electrical insulators and porcelain manufacturing.
👉 IEC Homepage - Full Range of Suspension Insulators – Explore our complete product portfolio for transmission and distribution line applications.
👉 Suspension Insulators Collection - NEMA Standards – Official publications covering insulator specifications (for cross‑reference with AS/BS).
👉 NEMA Store - Insulator String Assembly Guide – Installation best practices, string design, and torque specifications.
👉 Assembly Guide
For project‑specific inquiries or cross‑referencing to other stay insulator classes, please consult the relevant AS/BS standard documents or contact your engineering representative with the above specification table.
