Wire Stranding Classes
Wire stranding classes refer to the categorization of stranded wires based on their construction characteristics. Stranding involves bundling multiple thin wires together to create a single, thicker conductor. This design enhances flexibility and reduces wire breakage compared to a solid wire of equivalent size.
Concentric-Lay Conductors
CLASS B Stranding Wire: Power Cables. It’s commonly used in applications that require moderate flexibility, such as building wire, industrial cables, and control cables.
CLASS C: Power cables where more flexible stranding than Class B is desired. These are cables that need to endure moderate bending and movement, like machine tool wiring and portable cords.
CLASS D: Power cables where extra flexible stranding is desired. This is used in highly flexible applications, such as robotics and repetitive movement environments.
Rope-Lay & Bunch Stranded Conductors
CLASS G: All cables for portable use.
CLASS H: Cables where extreme flexibility is required. (i.e. take-up reels)
CLASS I: Apparatus cable and motor leads.
CLASS K: Cords and cables composed of No. 30 AWG copper wires. Stationary service. It is used in applications requiring high flexibility and durability, such as welding leads and flexible connectors.
CLASS M: Cords and cables composed of No. 34 AWG copper wires. Constant service.
| Stranding Class | Number of Strands | Flexibility | Typical
Applications |
Relative Cost |
|---|---|---|---|---|
| Class B | Moderate | Low | Building wire, fixed wiring in conduits | Low |
| Class C | High | Medium | Machine tool wiring, light-duty flexing | Medium |
| Class D | Higher | High | Robotics, cables requiring frequent bending | High |
| Class K | Very High | Very High | Welding cables, portable cords | Higher |
| Class G, H, I | Extremely High | Maximum | Specialized applications, extreme flexibility | Highest |
Selecting Wire Stranding Classes
Selecting the appropriate stranding class depends on the specific requirements of the application, including mechanical stress levels, environmental conditions, and cost considerations.