ASTM

ASTM Cable Standards Introduction

The American Society for Testing and Materials (ASTM) has established comprehensive standards for various types of electrical cables and conductors used in power transmission and distribution systems. These standards ensure consistent quality, performance, and safety across the electrical industry. Below is a detailed introduction to the key ASTM cable execution standards:

Standards We Followed

• ASTM A 475 – Metallic-Coated Steel Wire Strand
• ASTM B 228 – Concentric-Lay-Stranded Copper-Clad Steel Conductors
• ASTM B 231 – Concentric-Lay-Stranded Aluminum 1350 Conductors (AAC)
• ASTM B 232 – Aluminum Conductor Steel Reinforced (ACSR)
• ASTM B 399 – Concentric-Lay-Stranded Aluminum-Alloy 6201-T81 Conductors (AAAC)
• ASTM B 416 – Concentric-Lay-Stranded Aluminum-Clad Steel Conductors
• ASTM B 524 – Aluminum Conductor Aluminum-Alloy Reinforced (ACAR)
• ASTM B 549 – Aluminum Conductor Aluminum-Clad Steel Reinforced (ACSR/AW)
• ASTM B 711 – Aluminum-Alloy Conductors Steel Reinforced (AACSR)
• ASTM B 856 – Aluminum Conductor Steel Supported (ACSS)
• ASTM B 857 – Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors Steel Supported (ACSS/TW)

ASTM Class “A” and Class “B” Classifications

ASTM conductor classifications are based on application requirements and flexibility needs:

Class A Conductors

• Designed for conductors covered with weather-resistant materials
• Used in overhead applications where moderate flexibility is required
• Typically have fewer strands than Class B conductors
• Common in power transmission and distribution lines

Class B Conductors

• Designed for conductors insulated with various materials (rubber, thermoplastic, etc.)
• Require greater flexibility for installation and handling
• Have more strands than Class A for increased flexibility
• Used in building wiring, industrial cables, and underground applications

ASTM Solid Conductor Classification

Solid conductors under ASTM specifications refer to single-wire constructions:

• Applications: Building wire, equipment wiring, and low-voltage applications
• Size Range: Typically available in smaller AWG sizes
• Standards: Governed by various ASTM specifications including B-3 for copper wire
• Properties: Lower flexibility but easier termination and lower cost
• Installation: Suitable for permanent installations with minimal movement