UL 66-2005 pdf download – Fixture Wire.
5 Materials 5.1 Each material used in a fixture wire shall be applicable for the use and shall be compatible with all of the other materials used in the wire. 6 Conductor 6.1 Metal 6.1 .1 Except as noted in 6.1 .2, all conductors shall be of soft-annealed copper complying with the American Society for Testing and Materials Standard Specification for Soft or Annealed Copper Wire, ASTM B 3-01 . Copper strands that are smaller in diameter than 0.01 5 inch or 0.38 mm and are uncoated or have a coating of tin complying with the Standard Specification for Tinned Soft or Annealed Copper Wire for Electrical Purposes, ASTM B 33-00, or a tin/lead alloy coating complying with the Standard Specification for Lead-Coated and Lead-Alloy-Coated Soft Copper Wire for Electrical Purposes, ASTM B 1 89-95, are for products whose temperature rating does not exceed 1 50°C (302°F). Uncoated or tin/lead alloy coated or tin-coated solid copper conductors and uncoated or tin/lead alloy coated or tin-coated copper strands whose diameter is at least 0.01 5 inch or 0.38 mm are for products whose temperature rating does not exceed 200°C (392°F).
6.1 .2 Type PTF, PAF, KF-1 , KF-2, KFF-1 , KFF-2, ZHF, SF-1 , SF-2, SFF-1 , and SFF-2 wires not employing copper shall be of a nickel-base alloy complying with the American Society for Testing and Materials Standard Specification for Nickel Rod and Bar, ASTM B 1 60-99, and having a tensile strength of 65,000 ±1 5,000 lbf/in 2 or 448 ±1 03 MN/m 2 or 44,81 6 ±1 0,342 N/cm 2 or 45.7 ±1 0.5 kgf/mm 2 , an elongation of at least 35 percent, and a nominal volume resistivity of 66 ohm×cmil/ft at 20°C (68°F) or 0.1 1 0 ohm×mm 2 /m at 20°C (68°F). Where smaller in diameter than 0.01 5 inch or 0.38 mm, the individual copper strands of the conductor in Type PTFF and PAFF wires and the individual strands of a copper conductor in Type KF-1 , KF-2, KFF-1 , KFF-2, ZHF, SF-1 , and SF-2 wires shall have a nickel coating complying with the Standard Specification for Nickel-Coated Soft or Annealed Copper Wire, ASTM B 355-95, or a silver coating complying with the Standard Specification for Silver-Coated Soft or Annealed Copper Wire, ASTM B 298-99. The conductor in Type ZF, ZFF, XF, XFF, PF, PFF, PGF, and PGFF wires shall be of uncoated copper; of nickel-, silver-, or tin-coated copper; or of a nickel-base alloy – complying as stated in this paragraph and in 6.1 .1 . A copper conductor in Type PTF and PAF wires shall have a nickel coating complying with ASTM B 355-95.