These are generally used for checks and maintenance works on these apparatus. By enamelled, lined or coated apparatus as well as apparatus made from non-ferrous metals or plastics the applicability has to be checked. Base for railings at stairs according to this standards is DIN 28017-2. This document applies for stair constructions to which in the calculation the following traffic loads were laid to reason: For platforms, according to DIN 28017-1 and for steps, according to DIN EN ISO 14122-3. For stairs at machineries and constructions DIN EN ISO 14122-3 applies.