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Building wire, or electrical wire is used in commercial and residential construction throughout the world. The most commonly used type of wire is THHN or thermoplastic high heat-resistant nylon. TFFN or thermoplastic flexible fixture nylon wire is designed for fixture wire, because it's more flexible but less resistant to heat. NM-B or nonmetallic heat-rated cable is a popular choice for residential wiring and is typically installed beneath flooring and behind walls and ceilings and UF-B wire is the best choice for outdoor lighting. If you're looking for communication cables or fiber optic cables, we have that, too!.