DS/IEC 721-3-3:1990 Classification of environmental conditions. Part 3: Classification of groups of environmental parameters and their severities. Stationary use at weather protected locations.
1996DS/EN 60721-3-3:1996 Classification of environmental conditions - Part 3: Classification of groups of environmental parameters and their severities - Section 3: Stationary use at weatherprotected locations
1990DS/IEC 721-3-3:1990 Classification of environmental conditions. Part 3: Classification of groups of environmental parameters and their severities. Stationary use at weather protected locations.
DS/IEC 721-3-3:1990 Classification of environmental conditions. Part 3: Classification of groups of environmental parameters and their severities. Stationary use at weather protected locations. was changed to DS/EN 60721-3-3:1996 Classification of environmental conditions - Part 3: Classification of groups of environmental parameters and their severities - Section 3: Stationary use at weatherprotected locations.