Also see Risk of Falling. Floor openings, such as shafts, sewers, installation pits, must be capable of supporting loads and be fitted with non-displaceable covers. If this should not be possible, railings, safety fences or enclosures have to be provided. If this is not an option either, ledges or deflectors must be mounted or, as the last resort, fall zones must be made visible by means of signs or floor markings.
