KS C IEC 60721-2-4:2020 Classification of environmental conditions —Part 2-4: Environmental conditions appearing in nature —Solar radiation and temperature
2020KS C IEC 60721-2-4:2020 Classification of environmental conditions —Part 2-4: Environmental conditions appearing in nature —Solar radiation and temperature
2014KS C IEC 60721-2-4:2014 Classification of environmental conditions — Part 2-4: Environmental conditions appearing in nature — Solar radiation and temperature