The user shall cause the entire installation and all working parts of a transportation plant to be subjected to a thorough examination and a performance test, as prescribed by the standard to which the transportation plant was manufactured, by a person who has knowledge and experience of the erection and maintenance of transportation plants or similar machinery and who shall determine the serviceability of the structures, ropes, machinery and safety devices before they are put into use and every time after they are erected, and thereafter at intervals not exceeding 12 months: provided that in the absence of such prescribed performance test the entire installation of the transportation plant shall be subjected to a load of 120% of the rated mass load, applied over the complete operation range of such plant and in such a manner that every part of the installation is stressed accordingly.