ASTM B226-11(2021) PDF

Overview

ASTM B226-11(2021) - Standard Specification for Cored, Annular, Concentric-Lay-Stranded Copper Conductors is a comprehensive international standard developed by ASTM for the specification and use of round, soft copper wire conductors. These conductors may be uncoated or tin-coated and are designed for use in various electrical applications. The standard outlines requirements for the construction, physical and electrical properties, testing, packaging, and purchase of cored, annular, concentric-lay-stranded copper conductors.

Key Topics

• Scope and Application: Covers stranded copper conductors with a central core, suitable for bare or covered (weather-resistant) use, and for insulation with materials like rubber, varnished cloth, or impregnated paper. Not recommended for “oil-filled” or “gas-filled” applications or where extreme flexibility is required (such as for electric furnace leads).
• Material Requirements: Specifies the use of round, soft copper wires, either uncoated or tin-coated, conforming to related ASTM specifications.
• Core Construction: The core can be any agreed-upon material, with sufficient size and surface firmness to serve as a stable base for overlaid wires. Fiber and metal supporting cores are allowable, as agreed between manufacturer and purchaser.
• Conductor Configuration: Details on the nominal conductor size, wire arrangement, layers, diameters, and lay-up. Stresses proper placement and alignment for reliable conductor performance.
• Testing and Quality: Lays out procedures for verifying the physical and electrical properties of component wires before and after stranding. Specifies acceptable tolerances and requirements for elongation and consistency.
• Packaging and Marking: Requires robust packaging to prevent damage during transport, with clear, comprehensive identification of package contents and relevant details such as mass, length, size, conductor type, and corresponding order information.

Applications

Cored, annular, concentric-lay-stranded copper conductors produced in compliance with ASTM B226-11(2021) are widely used in electrical infrastructure due to their strength, stability, and reliable transmission capabilities. Common applications include:

• Overhead and underground power transmission: Both bare and insulated forms are ideal for long runs where mechanical integrity and longevity are essential.
• Heavy-duty electrical installations: Suitable for use as conductors within substations, large-scale distribution networks, and switchgear assemblies.
• Cable manufacturing: These conductors are frequently embedded within multi-core power and control cables that require a central supporting core for improved strength and electrical properties.
• Industrial environments: Used where weather-resistant or insulated conductors are critical, provided flexibility requirements are not extreme.

This standard is referenced globally, ensuring consistent quality and interoperability of copper electrical conductors in diverse installation and operating environments.

Related Standards

AstM B226-11(2021) refers to, and aligns with, several other key standards impacting copper conductor design, manufacturing, and application. These include:

• ASTM B3: Specification for Soft or Annealed Copper Wire
• ASTM B8: Specification for Concentric-Lay-Stranded Copper Conductors
• ASTM B33: Specification for Tin-Coated Soft or Annealed Copper Wire
• ASTM B172, B173, B174: Various specifications for rope-lay and bunch-stranded copper conductors
• ASTM B263: Test Method for Determination of Cross-Sectional Area of Stranded Conductors
• ASTM B354: Terminology Relating to Uninsulated Metallic Electrical Conductors

Other relevant standards include those from NIST (NBS Handbook 100-Copper Wire Tables) and ANSI (IEEE Standard 100), ensuring harmonization of terminology and measurement methods across the industry.

Keywords: cored conductor, annular copper conductor, concentric-lay-stranded, soft copper conductor, tin-coated copper, electrical conductor standards, ASTM copper conductor, stranded copper conductor.