No ropeway shall be constructed unless every part excepting the anchorages of foundations has a factor of safety of at least 4 under the maximum conditions. For foundation anchorages it shall be sufficient if the moment of resistence of the foundation exceeds the overturning moments by 50 per cent. The factor of safety of 4 shall be obtained in the case of the rope by dividing the actual breaking load of the rope by the maximum direct tension to which it will be subjected.
