UL 13 2019 pdf download – Power-Limited Circuit Cables.
2 Units of Measurement 2.1 In addition to being stated in the inch/pound units that are customary in the USA, each of the requirements is also stated in units that make the requirement conveniently usable in countries employing the various metric systems (practical SI and customary). Equivalent – although not necessarily exactly identical – results are to be expected from applying a requirement in USA or metric terms. Equipment calibrated in metric units is to be used when a requirement is applied in metric terms. 3 References and Terms 3.1 Wherever the designation “UL 1581” is used in this wire standard, reference is to be made to the designated part(s) of the Reference Standard for Electrical Wires, Cables, and Flexible Cords, UL 1581. Whenever the designation “UL 2556” is used in this standard, reference is to be made to the designated parts of the Standard for Wire and Cable Test Methods, UL 2556. 3.2 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. 3.3 Nylon designates a thermoplastic material whose characteristic constituent is a polyamide formed by the condensation of dibasic organic acids and diamines. Nylon used as a covering is unfilled and without reinforcement but may contain stabilizers, flame retardants, pigment, and/or other additives. 3.4 PBT designates a thermoplastic polyester material whose characteristic constituent is polybutylene terephthalate. PBT used as a covering is ufiled and without reinforcement but may contain flame retardants, pigment, and/or other additives.
7.2 Properties 7.2.1 General 7.2.1.1 An integral insulation and jacket shall be tested to, and meet the requirements of, a jacket material. See 7.2.4 and 7.2.5. 7.2.2 Unaged and heat aged requirements for insulation on conductors rated 60°C in all cables except Type PLTC 7.2.2.1 Specimens of unaged solid single-layer insulation removed from finished insulated conductors shall have a minimum tensile strength of 1200 Ibf/in2 or 8.27 MN/m2 or 827 N/cm2 or 0.844 kgf/mm2 and a minimum elongation of 100 percent when tested in accordance with the test Physical Properties (Ultimate Elongation and Tensile Strenth), in UL 2556. There shall be no cracks on either the inside or the outside surface of solid, foamed, or multilayered insulation after flexing around a mandrel after air-oven aging. Specimens of the insulated conductors approximately 12 in or 300 mm long shall be placed in a circulating air oven conforming to ASTM D 5423 (Type II ovens) and D 5374 and maintained at a temperature of 100 +2°C (212 +3.6°F) for 7 d (168 h) or 121 +2°C (249.8 +3.6°F) for 48 h at the manufacturer’s option. After removal from the oven, the specimens shall be allowed to cool to room temperature and then wound tightly, for six close turns, around a mandrel having a diameter no greater than that of the insulated conductor under test. The insulation shall be examined for cracks using a lens having magnification of 5X. The insulated conductor shall then be straightened, one side of the tube of insulation sliced off with a knife or razor-blade, and the conductor removed to permit examination of the inner surface of the insulation.