ETSI PRETS 300 019-1-8-1996 Equipment Engineering (EE); Environmental Conditions and Environmental Tests for Telecommunications Equipment; Part 1-8: Classification of Environmental Conditions Stationary Use at Underground Locations
1997ETSI PRETS 300 019-1-8-1997 Equipment Engineering (EE); Environmental Conditions and Environmental Tests for Telecommunications Equipment; Part 1-8: Classification of Environmental Conditions Stationary Use at Underground Locations
1996ETSI PRETS 300 019-1-8-1996 Equipment Engineering (EE); Environmental Conditions and Environmental Tests for Telecommunications Equipment; Part 1-8: Classification of Environmental Conditions Stationary Use at Underground Locations