Aluminum Conductor Composite Core (ACCC) | High-Temperature Low-Sag HTLS Conductor

Aluminum Conductor Composite Core (ACCC) is a next-generation high-temperature low-sag (HTLS) overhead transmission conductor. It features a high-strength carbon fiber composite core protected by a fiberglass sheath and helically wrapped with high-purity trapezoidal or round aluminum strands. This innovative design delivers significantly higher ampacity, lower sag, reduced line losses, and superior corrosion resistance compared to traditional ACSR or AAC conductors, making it the preferred solution for capacity upgrades and new high-voltage transmission projects.

What is Aluminum Conductor Composite Core (ACCC)?

ACCC is a High-Temperature Low-Sag (HTLS) overhead conductor that replaces the traditional steel core with a lightweight, high-tensile carbon fiber composite core. The core is encapsulated in a fiberglass/epoxy sheath for added protection and is surrounded by trapezoidal or round strands of fully annealed, high-purity aluminum (up to 62.5% IACS conductivity).

This design allows continuous operation at 180–200°C with minimal thermal expansion, enabling utilities to double power transfer capacity on existing rights-of-way without major tower modifications.

Key Advantages of ACCC Conductors

• Exceptional Ampacity — Safe continuous operation at 180–200°C provides up to twice the current-carrying capacity of equivalent ACSR conductors at the same sag limit.
• Ultra-Low Sag Performance — The carbon fiber core has an extremely low coefficient of thermal expansion above the knee-point temperature, allowing longer spans and reduced tower heights or reinforcements.
• Lightweight & High Strength — The composite core is approximately 70% lighter than steel while offering superior tensile strength, enabling 28–30% more aluminum content for better conductivity without increasing conductor weight or diameter.
• Reduced Electrical Losses — Higher aluminum content and optimized trapezoidal stranding deliver 25–40% lower DC resistance and line losses compared to ACSR.
• Superior Corrosion Resistance — Ideal for coastal, mining, industrial, and heavily polluted environments where steel-core conductors suffer accelerated corrosion.
• Excellent Thermal Stability & Low Creep — Minimal relaxation and long-term mechanical reliability under high temperatures and dynamic loads.

Main Applications

ACCC conductors are the preferred choice for:

• Capacity upgrades of existing transmission lines without tower modifications
• New long-span high-voltage overhead lines
• Coastal and high-corrosion regions
• Heavy ice/wind load areas and major river crossings
• Smart grid modernization and renewable energy integration projects

Technical Specifications (Representative International Sizes)

Ampacity values based on standard conditions (50 Hz, 25°C ambient, 0.5 solar absorptivity/emissivity, 0.61 m/s wind). Custom sizes and configurations available upon request.

Product Variants

RLB offers a complete range of ACCC conductors to meet diverse project needs:

• Formed Annealed Aluminum Conductors Composite Core Supported
• Thermal-resistant Aluminum-alloy Conductors Composite Core Reinforced
• Formed Intermediate Aluminum Conductors Composite Core Supported
• High-elongation Hard Aluminum Conductors Composite Core Reinforced
• High-conductivity (62.5% IACS) Aluminum Conductors Composite Core Reinforced

Manufacturing Standards & Quality

Produced in full compliance with:

• GB/T 32502—2016 (Overhead electrical stranded conductors — Composite core supported/reinforced)
• Q/320282 DFP08—2017
• Q/320282 DFP05—2017
• ASTM B987 (international reference)

Every conductor undergoes rigorous testing for tensile strength, electrical resistance, thermal-mechanical performance, and long-term creep to ensure consistent quality and 30+ years of reliable service.

Packaging & Supply

Supplied on high-strength Wooden Steel Wood Drums or Steel Drums engineered for safe transportation, storage, and on-site handling of long continuous lengths.

Why Cable & Utility Customers Choose RLB ACCC Conductors

RLB ACCC conductors combine proven composite core technology with decades of cable manufacturing expertise to deliver higher grid capacity, lower losses, longer spans, and reduced total cost of ownership. When paired with our full range of transmission line solutions, fittings, and technical support, you receive a complete, reliable system optimized for your project.

Inquiry Now to discuss technical specifications, custom conductor designs, or complete transmission solutions for your next capacity upgrade or new high-voltage project. Our team provides professional consultation and supports long-term partnership.