TFFN este o simbolizare de cablu conform NEC / UL (USA): T = Thermoplastic (PVC) insulation; FF = Flexible fixture (stranded) wire; N = Nylon outer covering; TFFN = Thermoplastic flexible fixture wire, nylon-coated. 600 V, 90 C. UL 66; NEC Article 402.
6 sisteme de codificare recunosc această simbolizare