Overhead bare conductors IEC61089
Description: IEC 61089 is the standard for bare overhead stranded conductors, covering AAC, AAAC, ACSR, ACAR, and steel-reinforced variants. It unifies material specs, construction, electrical/mechanical performance, and testing to deliver safe, efficient, and used in power transmission and distribution (T&D) networks
Standard: IEC 61089
1. Scope & Core Materials
The standard applies to concentric-lay stranded conductors composed of round wires, using the following primary materials:
SA1A/SA1B/SA2: Aluminum-clad steel (for corrosion resistance).
Aluminum (A1): Hard-drawn pure aluminum (min. 99.7% purity, 1350-H19 alloy).
Aluminum Alloys (A2, A3): Heat-treated alloys for higher strength.
Steel:S1A/S1B/S2A/S3A: Zinc-coated (galvanized) steel.
2. Main Conductor Types (per IEC 61089)
2.1 AAC (All Aluminum Conductor)
Structure: Concentric layers of hard-drawn pure aluminum wires (A1).
2.2 AAAC (All Aluminum Alloy Conductor)
Structure: Stranded from high-strength aluminum alloys (A2/A3).
2.3 ACSR (Aluminum Conductor Steel Reinforced)
Structure: Galvanized steel core (S1A/S2A) + outer layers of aluminum (A1).
2.4 ACAR (Aluminum Conductor Alloy Reinforced)
Structure: Aluminum alloy core + pure aluminum outer strands.
2.5 ACSW / Steel Core Variants
Uses aluminum-clad steel (SA) cores for extreme corrosion resistance (e.g., coastal/industrial zones).
3. Specifications (per IEC 61089)
3.1 Construction
Outer diameters: Typically 6.0 mm – 45.0 mm.
Concentric lay: Wires helically stranded in concentric layers (each layer opposite direction).
Cross-sections: Nominal areas from 10 mm² to 1500 mm².
3.2 Electrical Properties
Conductivity: Standardized for each material (A1: 61% IACS).
DC Resistance: Max values defined at 20°C (e.g., ~0.0326 Ω·mm²/m for A1).
Temperature Coefficient: ~0.00360 /°C (aluminum).
3.3 Mechanical Properties
Thermal Expansion: ~23 × 10⁻⁶ /°C (aluminum).
Tensile Strength / Breaking Load: Minimum values per cross-section.
Elongation: Minimum elongation at break.
Modulus of Elasticity: Defined for layered constructions.
IEC61089 Cable
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IEC 61089 is an international standard published by the International Electrotechnical Commission (IEC) that specifies the design, materials, construction, electrical/mechanical properties, and testing requirements for round wire concentric lay overhead stranded conductors. It unifies global standards for power transmission and distribution (T&D) conductors, superseding older IEC standards (60207, 60208, 60209, 60210) .
The standard applies to four primary conductor types:
AAC (All Aluminum Conductor): Pure hard-drawn aluminum strands (A1)
AAAC (All Aluminum Alloy Conductor): High-strength aluminum alloy strands (A2/A3)
ACSR (Aluminum Conductor Steel Reinforced): Aluminum outer layers + galvanized steel core (S1A/S2A)
ACAR (Aluminum Conductor Alloy Reinforced): Aluminum outer strands + aluminum alloy core .
Allowed materials include:
Aluminum: Hard-drawn pure aluminum (A1, 99.7% purity) and heat-treated aluminum alloys (A2/A3)
Steel: Zinc-coated (galvanized) steel (S1A/S1B/S2A/S3A) and aluminum-clad steel (SA1A/SA1B/SA2) for corrosion resistance .
The standard mandates strict testing for:
Electrical performance: DC resistance (at 20°C), conductivity (e.g., 61% IACS for A1 aluminum)
Mechanical properties: Tensile strength (RTS), elongation, bending resistance, creep resistance
Materials: Wire purity, coating thickness (galvanized/aluminum-clad)
Dimensions: Outer diameter, stranding pitch, lay length .
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