TF is the UL designation for fixture wire, a solid soft copper conductor insulated with thermoplastic lead-wire insulation.
TF is a UL designation for a type of fixture wire. It identifies a wire with a solid, soft (annealed) copper conductor insulated with a thermoplastic lead-wire compound. Fixture wire is used for the internal wiring of lighting fixtures and for connecting fixtures to their supply, where flexibility, insulation quality, and an appropriate temperature rating are needed. The solid conductor of TF suits it to fixed connections within fixtures.
The soft copper conductor of TF provides good conductivity and workability, while the thermoplastic insulation offers electrical separation, moisture resistance, and durability. The stranded counterpart of TF is designated TFF, which adds flexibility.
In commercial and industrial lighting, fixture wire designations like TF identify wire suited to luminaire wiring. Recognizing the designation helps in selecting wire matched to fixture requirements.
Because the soft copper conductor of TF provides good conductivity and workability while the thermoplastic insulation offers electrical separation, moisture resistance, and durability, the solid conductor suits TF to fixed connections within fixtures, with the stranded counterpart designated TFF for flexibility.
Recognizing that TF denotes solid-conductor thermoplastic fixture wire helps customers interpret references accurately when specifying wire for the internal wiring of commercial and industrial lighting fixtures.
At Windy City Wire, an understanding of fixture wire designations, including TF, supports clear communication about lighting wire. Recognizing that TF denotes solid-conductor thermoplastic fixture wire helps customers interpret references accurately when specifying wire for commercial and industrial lighting.
TF (UL fixture wire designation, solid conductor)
UL (Underwriters Laboratories), which assigns fixture wire designations