DIN EN 60721-3-3/A2:1997 环境条件分类.第3部分:环境参数组及其严酷程度分类.第3节:气候防护场所用固定装置.修改件A2
Classification of environmental conditions - Part 3: Classification of groups of environmental parameters and their severities; section 3: Stationary use at weatherprotected locations; Amendment A2 (IEC 60721-3-3:1994/A2:1996); German version EN 60721-3-3