TFF is the UL designation for fixture wire, the same as TF but with a stranded copper conductor.
TFF is a UL designation for fixture wire that is the same as TF but built with a stranded copper conductor instead of a solid one. The stranding gives TFF greater flexibility, suiting it to fixture wiring that must bend or flex during assembly or use. Like TF, it uses a thermoplastic lead-wire insulation and is intended for the internal wiring of lighting fixtures and for connecting fixtures to their supply.
Because the stranded conductor flexes more readily than the solid conductor of TF, TFF is chosen where flexibility is wanted in fixture wiring. The thermoplastic insulation provides electrical separation, moisture resistance, and durability for these connections.
In commercial and industrial lighting, fixture wire designations like TFF identify flexible wire suited to luminaire wiring. Recognizing the designation and its relationship to TF helps in selecting wire matched to fixture requirements.
Because the stranded conductor flexes more readily than the solid conductor of TF, TFF is chosen where flexibility is wanted in fixture wiring, with the thermoplastic insulation providing electrical separation, moisture resistance, and durability for the internal connections of lighting fixtures.
At Windy City Wire, an understanding of fixture wire designations, including TFF, supports clear communication about lighting wire. Recognizing that TFF denotes stranded, flexible thermoplastic fixture wire helps customers interpret references accurately when specifying wire for commercial and industrial lighting.
TFF (UL fixture wire designation, stranded conductor)
UL (Underwriters Laboratories), which assigns fixture wire designations