EN 60721-3-4:1995
环境条件分类.第3部分:环境参数组及其严酷程度的分类.第4节:在无天气防护场所使用的固定装置;包含修改件A1-1997;IEC 721-3-4:1995+A1:1996
Classification of Environmental Conditions; Part 3: Classification of Groups of Environmental Parameters and Their Severities; Section 4: Stationary Use at Non-Weatherprotected Locations (Incorporates Amendment A1: 1997)