ETSI ETS 300 019-1-8-1997
設備工程(EE).通信設備的環境條件和環境測試.第1-8部分:環境條件的分類.在地下場所的固定使用
Equipment Engineering (EE); Environmental Conditions and Environmental Tests for Telecommunications Equipment; Part 1-8: Classification of Environmental Conditions Stationary Use at Underground Locations