UL 66:2020 PDF Download

UL 66:2020 is a standard that outlines the basic construction, test, and marking requirements for fixture wires. Fixture wires are single conductor wires used in electrical fixtures. The standard identifies various types of fixture wires, categorized based on their voltage rating.

The 600 volt types include PTF, PTFF, PAF, PAFF, KF-2, KFF-2, PF, PFF, PGF, PGFF, SF-2, SFF-2, ZF, ZFF, ZHF, TF, TFF, TFN, TFFN, RFH-2, FFH-2, FFHH-2, RFHH-2, and RFHH-3. These types are designed for specific uses as specified in Article 402 and other relevant parts of the National Electrical Code (NEC), which is ANSI/NFPA 70.

The 300 volt types include KF-1, KFF-1, SF-1, SFF-1, XF, and XFF. These types also have specific applications as described in the standard's index.