BS EN 131-6:2019 pdf free.Ladders.
4 Functional dimensions 4.1 General dimensions Dimensions are given in EN 131-1. 4.2 Specific dimensions For leaning telescopic ladders dimension l3 is not applicable providing l6, see 4.3, is fulilled. If l6 is not fulflled l3 shall begreater than 0,5 I5 and less than I5 + 15 mm measured along a line in the middle of the stiles. 4.3 Top rung clearance l6 The dimension l6 is the horizontal clearance between the top rung and any obstruction (specifically the wall) when the ladder is in its position of use. The dimension l6 is the horizontal distance between the top rung and the wall when measured with the ladder in its position of use at any angle between 65° and 75° (see Figure 1). This shall not be less than 35 mm and not more than 300 mm. The minimum clearance between the top rung and any obstruction shall be 35 mm in any case.5 Requirements 5.1 General requirements The drawings in this part of EN 131 are examples only and products do not need to correspond. However, dimensions are binding. For other requirements EN 131 -2:2010+ A2:2017, Clause 4 applies. 5.2 Distance between rungs/steps When the ladder is in its position of use the rungs/steps allowed to stand on shall always be equally spaced in accordance with EN 131-1:2015, 4.1.In the position of use the construction shall not allow different distances between the rungs/steps with a tolerance of +2 mm in the ascendable part of the ladder and ensure that the rung/step sections that are not extended shall be stacked at the top of the ladder. Manufacturer shall take all necessary precautions to prevent these distances been altered without manipulation and the use of tools. 5.3 Additional requirements for the top of leaning ladders The top of the ladder shall be designed in a way that a 2-point area of contact between the top of the ladder and a vertical plane can be ensured. 5.4 Locking of the rung/step sections The ladder shall be designed in way that all extended rung/step sections are locked when the ladder is in the position of use. Every rung/step section shall have a locking mechanism for each stile. With the ladder in position of use it shall be clearly visible to the user that all of the locking mechanisms are locked or unlocked. NOTE Visible indication can for example be a coloured area of a visible locking pin.BS EN 131-6 pdf download.