UL 1690-2011 pdf download
UL 1690-2011 pdf download.Data-Processing Cable.
21 Cold Bend Test of Complete Cable
21.1 After being conditioned for 4 h in circulating air that is precooled to and maintained at a temperature of _20.0cC, +3.OeC, —2.0CC (-4.0F. +5.4F, -3.69. specimens of the complete cable shall not be damaged when the specimens are individually wound onto a round mandrel as described in 21.2 and 21.3.
21.2 Four straight test lengths of the complete finished cable are to be cooled for 4 Ii in circulating air that is precooled to and maintained at a temperature of —20.0CC. +3.OC. -2.01C (—4.Oc. +5.4’F. —3.6F). At the end of the fourth hour. the specimens are to be removed from the cold chamber one at a time and are to be wound individually for 3 full turns around a circular wooden mandrel of a diameter equal to 8 times the calculated diameter or length of minor axis of the outside of a cable that does not contain any shield, or equal to 12 times the calculated diameter or length of minor axis of the outside of a cable that contains one or more shields (coaxial members are included here). There is not to be any more tension applied to a specimen than is necessary to keep the surface of the specimen in contact with Pie mandrel, Adjacent turns are to touch one another The winding of each specimen is to be conducted at an approximately uniform rate of 5 seconds per turn, and the time taken to remove a specimen from the cold chamber and complete the winding is not to exceed 30 s. As an alternative, the test may be performed in the cold chamber using wood or metal mandrels.
21.3 With a minimum of handling and while remaining in the coiled form, each specimen is to be slid from the mandrel and placed on a horizontal surface. The specimens are to rest on the surface undisturbed for at least 4 h in still air to warm at a room temperature of 24.0 ±8.0CC (75.2 ±14.4F) before being examined for surface damage. Each specimen is then to be disassembled and examined further for damage. The cable is acceptable if. for the first length tested, there aren’t any cracks, splits, tears, or other openings in any part of the cable. Cracking on the inside surface of a jacket or of the insulation can be detected as circumferential depressions in the outer surface of a jacket or insulation of material other than a fluoropolymer. Circumferential depressions in a fluoropolymer surface are likely to be yield marks (locally stronger points) rather than indicators of cracking. If the first test length has any of these faults. acceptance is to be governed by the results obtained from the three remaining test lengths. The cable is not acceptable ii any of the three additional test lengths have one or more faults, The examinations are to be made with normal or corrected vision without magnification.
22 Spark and Dielectric Withstand Test Alternatives for Type DP-3 Series Cables
22.1 The insulation on each conductor for and in every length of integral Type DP-3 and DP-3P cables shall comply with a spar1 test without faults. The insulation on each conductor for and in every length of nonintegral Type DP-3 and DP-3P cables shall comply with a spark test without faults or a dielectric withstand test. One hundred percent of production is to be tested by the manufacturer at the factory. Within a factory, different alternatives may be chosen for different sizes of the same construction.
22,2 The spark test indicated in 22.1 is to be a cf-c spark test of 2500 V or an rms a-c spark test of 1750 V on each insulated conductor before the conductor is assembled into the cable or, if applicable, on each twisted pair alter pairing and before the pair is assembled into the cable. No faults are acceptable. The test equipment and method are to be as described in Spark Tests for Power-Limited Circuit Cable and for Cable for Power-Limited Fire-Alarm Circuits, Section 910 of UL 1581.
