本文件适用于永久性固定的金属梯子，永久性地安装在倾斜屋顶的承重结构上，并可以步进或走路，以便安装在屋顶表面上方的设备的检查，维护和修理。 本文件规定了基本尺寸，要使用的材料，承重能力的要求以及测试的程度。 本文件不包括不能永久固定的走道，单面踏板，单步或屋顶梯，也不包括防火梯

This document applies to permanently fixed ladders made of metal which are permanently installed on the load-bearing construction of pitched roofs and which may be stepped or walked on for purposes of inspection, maintenance and repair of equipment installed above the roof surface. This document specifies essential dimensions, materials to be used, requirements with respect to the load-bearing capacity, and the extent of testing. This document does not cover walkways, single treads, single steps or roof ladders that are not permanently fixed nor does it cover fire escape ladders.