DIN EN 60721-2-2:2016
环境条件分类.第2-2部分:自然界出现的环境条件.降水和风(IEC 60721-2-2-2012).德文版本EN 60721-2-2-2013
Classification of environmental conditions - Part 2-2: Environmental conditions appearing in nature - Precipitation and wind (IEC 60721-2-2:2012); German version EN 60721-2-2:2013