Overview
IEC TR 62602:2009 is a technical report published by the International Electrotechnical Commission (IEC) that provides detailed data on conductors of insulated cables sized according to the American Wire Gauge (AWG) and kcmil systems. Covering nominal cross-sectional areas ranging from 20 AWG to 2000 kcmil (approximately 0.52 mm² to 1010 mm²), this report specifies conductor dimensions, resistance values, and construction requirements for solid and stranded conductors made from copper, aluminium, and aluminium alloys. It focuses on power cables and cords used predominantly in fixed installations and flexible cable applications.
This report complements IEC 60228, which uses metric sizing, by addressing the specific needs of regions where AWG and kcmil sizing are standard, such as North America. It aims to support harmonization toward a unified international conductor sizing system.
Key Topics
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Conductor Size Range and Classification
The report covers conductor sizes from 20 AWG to 2000 kcmil and classifies conductors into four classes based on construction and flexibility:
- Class 1: Solid conductors for fixed installations
- Class 2: Stranded conductors for fixed installations
- Class 5: Flexible copper conductors
- Class 6: Highly flexible copper conductors
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Materials and Mechanical Properties
Conductors include plain or metal-coated annealed copper and aluminium or aluminium alloy, with specified tensile strength ranges for solid and stranded aluminium conductors, ensuring mechanical reliability in different applications.
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Electrical Resistance and Measurement
The technical report provides maximum resistance values for conductors, emphasizing the resistance of single-core cables while offering correction factors for multi-core configurations. Annexes detail precise resistance measurement methods and temperature correction formulas to ensure accurate assessments under varying conditions.
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Dimensional Specifications
Dimensional limits and tolerances for circular conductors-both solid and stranded-are specified, allowing manufacturers and users to maintain consistency and compatibility in cable production and application.
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Exclusions and Scope Limitations
The standard does not apply to conductors intended for telecommunications, data transmission cables, winding wires, or other specialized wire products. It also primarily addresses conductors as finished within cables rather than as standalone components for cable assembly.
Applications
IEC TR 62602:2009 is essential for stakeholders involved in:
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Power Cable Manufacturing
Guiding manufacturers on conductor dimensions and resistance to meet regional sizing standards (AWG/kcmil), enabling consistent electrical and mechanical performance in power distribution and industrial cables.
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Cable Design and Engineering
Providing electrical engineers and designers with reliable reference data for conductor resistance values and cross-sectional properties, essential for calculating current carrying capacity, voltage drop, and thermal performance.
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Quality Assurance and Testing
Supplying test methods and temperature correction factors for measuring conductor resistance, supporting accurate quality control and compliance verification across different conductor types and sizes.
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International Harmonization Efforts
Serving as a foundational document in the IEC TC 20 committee’s three-stage plan to harmonize conductor sizes globally, ultimately aiming for a combined standard to facilitate international trade and equipment interoperability.
Related Standards
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IEC 60228: Conductors of Insulated Cables
The principal IEC standard that defines conductor cross-sectional areas and performance requirements using metric-based sizes. IEC TR 62602 complements this by integrating AWG and kcmil data to bridge regional differences.
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National Electrical Codes and Regulations
Many countries, especially in North America, mandate the use of AWG/kcmil conductor sizes in electrical installation codes, making IEC TR 62602 a vital reference in aligning international standards with these legal frameworks.
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ISO/IEC Directives, Part 2
The document adheres to international procedures for drafting standards and reports, ensuring alignment with globally recognized standardization processes.
By adhering to IEC TR 62602:2009, manufacturers, engineers, and regulators can ensure consistent conductor sizing, reliable electrical performance, and smooth transition toward globally harmonized cable standards. This technical report fills a vital role in international standardization of power cable conductors sized by AWG and kcmil systems.