UL 758-2017 pdf download

UL 758-2017 pdf download.Appliance Wiring Material.
7.3 ThIckness
7,3.1 Measurements from which the average thickness is to be determined shall be made in accordance with Thicknesses of Insulation on Flexible Cord and on Fixture Wire, Section 250, of UL 1581. When the average thickness is equal to or less than 0.002 Inch (0.05 mm), the average thickness shall be rounded to the nearest 0.0001 inch (0.0025 mm) and an optical measuring device capable of measuring to the nearest 0.0001 inch (0.0025 mm) shall be used for taking thickness measurement.
7.3.1 eItectne Seplemt’e 3.2014
7.3.2 The minimum thickness at any point shall be at least 90 percent of the required average thickness, rounded to the nearest 0.001 Inch (0.025 mm). When the minimum thickness at any point is equal to or less than 0.002 inch (0.05 mm), the minimum thickness at any point shall be rounded to the nearest 0.0001 inch (0.0025 mm) and an optical measuring device capable of measuring to the nearest 0.0001 inch (0.0025 mm) shall be used for taking thickness measurement.
73.2 elfectieg Sptemrew 3. 2014
7.3.3 When individual conductor strands of a stranded conductor are less than 0.040 in (1.0 mm) in diameter or width, and the measurement of the insulation thickness is made using an optical measuring device, 0.003 in (0.08 mm) shall be added to the measured value of average and minimum at any point of insulation thickness before comparing it with the required minimum thickness. The addition of the 0.003 in (0.08 mm) to the measured value does not apply to the following constructions:
a) Average thickness less than 15 mils (0.38 mm),
b) Minimum thickness at any point less than 13 mils (0.33 mm).
C) Compact or compressed stranded conductors,
d) A stranded conductor covered by a separator, or
B) A stranded conductor covered by a tape or braid insulation.
7.3.4 For wires with solid, extruded insulation which do not have a restricted use, the thicknesses shown in Tables 7.4 and 7.5 apply. Thinner thicknesses than shown in Tables 7,4 and 7.5, foamed and foamlskin, or non’extruded insulation may be evaluated for unrestricted use by subjecting the wires to the Crush Resistance Test, Section 28. Wires with solid, extruded insulation that are intended to be used in a jacketed cable or in a cable with an outermost layer of covering are not required to comply with either the thicknesses shown in Tables 7.4 and 7.5 or with the Crush Resistance Test.
7.3.5 The requirements for the wires noted in Tables 7.4 and 7.5 are applicable to wiring that is intended to be instailed In a normal application, such as for use in environments where it is subject to flexing. Wiring is not prohibited from being evaluated for special ratings where the thickness shall be determined in accordance with the requirements of 7.3.1. Special applications for which the wiring has been evaluated shall be marked on the tag or spool of the finished product.
8 Coveilngs
8.1 Coverings over insuLated conductors, groups of insulated conductos. o coaxial members are optional unless the covenng is required in order for the construction to comply with a flame rating.
8.2 An overall braid may be of a close weave covering the insulation, shield, or other nonmetallic braid. The braid shall extend for the entire length of the finished wire and shall be consistent throughout its entire length. Each end shall consist of the same kind, size, and ply of yam. The number of picks per inch or the number of picks per centimeter is not specified. A glass braid shall be lacquered or otherwise treated to prevent fraying. The temperature rating of the finished wire using a braid shall not exceed the temperature limit of the yam specified Table 8.1.