ASTM Standard Building Wire
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ASTM UL Thermoplastic Wire Type TW/THW THW-2 Cable
TW/THW wire are a solid or stranded, soft annealed copper conductor insulated with Polyvinylchloride (PVC).
TW wire stands for a thermoplastic, water-resistant wire.
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ASTM UL Thermoplastic High Heat Resistant Nylon Coated THHN THWN THWN-2 Wire
THHN THWN THWN-2 Wire are suitable for use as machine tool, control circuit, or appliance wiring. Both THNN and THWN have PVC insulation with nylon jackets. The thermoplastic PVC insulation makes THHN and THWN wire have flame-retardant properties, while the nylon jacketing also adds resistance to chemicals such as gasoline and oil.
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ASTM UL XLPE XHHW XHHW-2 Copper Wire High Heat-resistant Water-resistant
XHHW wire stands for “XLPE (cross-linked polyethylene) High Heat-resistant Water-resistant.” XHHW cable is a designation for a specific insulation material, temperature rating, and condition of use (suitable for wet locations) for electrical wire and cable.