DIN EN 60721-2-2:2016
環境條件分類.第2-2部分:自然界出現的環境條件.降水和風(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