What Class stranding do most building wires, like THHN and XHHW, utilize?

Building wires such as THHN (Thermoplastic High Heat-resistant Nylon-coated) and XHHW (Cross-linked High Heat-resistant Water-resistant) typically utilize Class B stranding. Class B stranding consists of circular strands that are tightly twisted together to form a conductor. This design offers enhanced flexibility and conductivity compared to other classes, which is essential for installation in various settings, including residential, commercial, and industrial applications.

The choice of Class B stranding in these types of wires also contributes to their durability and resistance to wear, making them suitable for environments where they might be subject to movement or flexing. Additionally, Class B stranding complies with industry standards for wire performance, ensuring safety and reliability in electrical installations.