IEC 61386-23-2021 pdf Conduit systems for cable management – Part 23: Particular requirements – Flexible conduit systems

10.5.101 An assembly consisting of a conduit with a terminating conduit fitting, assembled in accordance with the manufacturer’s instructions, shall be subjected to a flexing test by means of the apparatus shown in Figure 101. 10.5.102 The test shall be made on six samples of conduit of an appropriate length. Three of the samples shall be tested at the minimum declared temperature for transport, application and installation as given in Table 1 with a tolerance of ±2 °C. The other three samples shall be tested at the maximum declared application and installation temperature as given in Table 2 with a tolerance of ±2 °C. A manufacturer may declare that a flexible conduit is suitable for transport and installation according to Table 1 but may only be suitable for flexing at ambient temperature as a minimum. In this case the test shall be carried out at (20 ± 2) °C and the third digit of the classification code shall be X. The manufacturer shall clearly declare in its literature both the minimum transport and installation temperature in accordance with Table 1, the minimum application temperature which is ambient and the maximum installation and application temperature in accordance with Table 2. 10.5.103 The sample shall be fixed to the oscillating member by means of the terminating conduit fitting as shown in Figure 101, so that when the conduit is at the middle of its travel, the axis of the conduit is vertical and passes through the axis of the oscillation. The apparatus with the sample shall be conditioned for 2 h or until the sample has attained the declared temperature, whichever period is the longer. 10.5.104 The oscillating member shall be moved backwards and forwards through a total angle of (180 ± 5)° divided equally about the vertical axis. The assembly shall be subjected to 5 000 flexings at a rate of (40 ± 5) flexings per minute.
A sample of a conduit and terminating conduit fitting shall be assembled in accordance with the manufacturer’s instructions and mounted as shown in Figure 103. A current of 25 A, having a frequency of 50 Hz to 60 Hz, derived from an AC source having a no-load voltage not exceeding 12 V, shall be passed through the assembly for ( 60 +50 ) s. Then the voltage drop shall be measured between the points shown in Figure 103 and the resistance calculated from the current and this voltage drop.