UL 44-2018 pdf free download.Thermoset-Insulated Wires and Cables.
4.1.2 Aluminum conductors
4.1.2.1 Aluminum conductors shall only be of aluminum conductor material (ACM), AA 8000 series alloy.
Annex C provides the chemical composition of recognized aluminum alloy conductor materials.
4.1.2.2 In Mexico, thermoset-insulated aluminum conductors are limited to sizes 13.3 mm2 (6 AWG) and larger in accordance with NOM-0O1 -SEDE, Standard for Electrical Installations,
4.1.3 Copper-clad aluminum conductors
In the United States, the requirements of Annex 0 shall apply to solid conductors or the individual wires of stranded conductors prior to stranding.
In Canada and Mexico, copper-clad aluminum conductors shall not be used in thermoset-insulated wires and cables.
4.1.4 Copper conductors
4.1.4.1 General
The requirements of 4.1.4.2 or 4.1.4.3 shall apply to solid conductors or the individual wires of stranded conductors prior to stranding. It the insulation adjacent to a copper conductor is of a material that corrodes unprotected copper, as determined by the requirement in 5.7, or if a protective separator in compliance with 4.1.8 is not provided, the solid conductor and each of the individual strands of a stranded conductor shall be separately covered with a coating as described in 4.1.4.2.
4.1.4.2 Coated copper conductors
4.1.4.2.1 Each tin-coated conductor shall comply with the requirements of ASTM B33 or NMX-J-008-ANCE; a nickel-coated wire shall comply with ASTM B355, and a silver-coated wire shall comply with ASTM B298. Conductors coated with other metals or alloys shall be subjected to special investigation.
Note: In Mexico. the use of ASTM 8355 is recommended to, nickel-coated wire, and the use of ASTM 6298 is recommended tar sltver-coated wire.
4.1.4.2.2 A metal coating, when not required, is appropriate for use on solid or individual wires (strands) or selected wires, such as the outer layer of wires of a stranded conductor. The metal coating when used shall comply with 4.1.4.1.UL 44 pdf download.