UL 9990-2017 pdf download – Outline of Investigation for Information and Communication Technology (ICT) Power Cables.
8 Flexing Test 8.1 A cable assembly shall be capable of withstanding a minimum of 200 cycles of flexing when tested in accordance with (a) or (b) below. After the test, there shall be no evidence of stress or damage on the internal connections including breakage of any conductors. Stress or damage can be determined through visual examination, dielectric voltage withstand test described in Section 10, electrical continuity or other similar means. If the connectors used for the cable assembly are different at each end, each connector/cable combination is to be tested. a) The Cable Flexing test in Cable Flexing Test Procedure for Electrical Connectors, EIA 364- 41. No physical damage or discontinuity over 1 ms during flexing shall occur to the cable assembly with Dimension X = 3.7 times the cable diameter and 1 00 cycles in each of two planes, 120 degree arc. b) A sample of the cable assembly is to be secured to the flexing apparatus so that the cord assumes the natural bend permitted by the assembly. Each connector is to be secured in the jaws of the flexing machine so that the point of cord exit is at the center of rotation. The rotating jaws are to be adjusted to rotate to an angle of 90 degrees to each side of the centered position. At the centered position, the cord is to hang vertically and a test weight of 113 g (4 oz) is to be attached to the cord approximately 305 mm (12 inches) from the point of rotation as illustrated in Figure 8.1. Each cable assembly is to be subjected to 100 complete flexing cycles in each plane. A flexing cycle consists of rotation of the jaws from the vertical (centered) position until 90 degrees to one side, back past the vertical position until 90 degrees to the other side, and back to the vertical position.
9.4 The thermocouples and related instruments are to be accurate and calibrated in accordance with standard laboratory practice. The thermocouple wire is to conform to the requirements specified in the Tolerances on Initial Values of EMF versus Temperature tables in the Standard Specification and Temperature-Electromotive Force (emf) Tables for Standardized Thermocouples, ASTM E230/E230M. 9.5 Temperatures on the connector and cable are to be monitored using a temperature-indicating device. The temperature measurement is to be made on the wiring terminals of each device if they are accessible for the mounting of thermocouples. If the wiring terminals are inaccessible, temperatures are to be measured as close as possible to the device current carrying contacts. 9.6 This test shall be conducted in a draft-free location having an ambient temperature of 25 ±5°C (77 ±9°F). Tests conducted at an ambient temperature other than 25°C are to have the test results corrected to an ambient temperature of 25°C by adding or decreasing the appropriate variation between 25°C and the ambient. 10 Dielectric Voltage-Withstand Test 10.1 The cable assembly shall withstand without arc-over or breakdown, the application of a 500 volts DC test potential. The test potential shall be applied between the power bus contacts of the connector individually or tied together and the following: a. The ground/return contacts of the connector individually or tied together; b. The data/signal contacts of the connector individually or tied together; and c. Any non-current-carrying metal parts.