1、EN ISO 14122-3:20013.1Stairs and step laddersthe definitions stated in 3.2 and 3.3 of EN ISO 14122-1:2001 are completed by:Succession of horizontal levels (steps or landings) allowing passage on foot from one level to another composed of the following elements, shown in Figure 1 and explained from 3
2、.1.1 to 3.1.16KeyH: Climbing heightg: Goinge: Headroomh: Risel: Length of landingr: Overlap: Angle of pitchW: WidthP: Pitch linet: Depth of stepc: ClearanceFigure 1 Parts of stairs and step ladders5 Safety requirements applicable to stairs5.1 Going, g, and rise, h, shall meet the formula (1):600 _ g
3、 + 2h _ 660 (dimensions in mm) (1)5.2 The overlap, r, of the step shall be 10 mm and shall apply equally to landings and floors.5.3 On the same flight, the rise shall be constant wherever possible. In the case where it is not possible to maintain the height of the rise between the level of departure
4、 and the lower step, it may be reduced by a maximum of 15 %. If it is justified, it may be increased, for example in the case of certain mobile machines.5.4 The uppermost step shall be level with the landing (see Figure 3).NOTE: The principle of maintaining the going at the top of the stair is important and a change of going at the landing which is the last step is a significant cause of accidents.
