I recently completed my U/S inspection and certification of a three phase industrial/commercial installations, and according to my trainer the use of pvc flexible conduits on a permanent installation was never approved, however we have a general regulation on flexible conduits in SANS 10142, clause 6.5.4.2.
I would like to know the specs of this item from SANS 61386-23, if anyone with this document can at least e-mail me the section prohibiting the use of flexible pvc conduits in a permanent installation.