SPT-1 is een kabelaanduiding volgens NEC / UL (USA): S = Service cord; P = Parallel (zip) construction; T = Thermoplastic (PVC); -1 = Insulation thickness class 1 (UNVERIFIED); SPT-1 = Parallel thermoplastic lamp cord, insulation class 1. 300 V, 60 to 105 C (UNVERIFIED). UL 62; NEC Table 400.4.