KS C IEC 60721-3-2-2020 Classification of environmental conditions —Part 3-2: Classification of groups of environmental parameters and Classification of groups of environmental parameters and
2020KS C IEC 60721-3-2:2020 Classification of environmental conditions —Part 3-2: Classification of groups of environmental parameters and Classification of groups of environmental parameters and
2004KS C IEC 60721-3-2:2004 Classification of environmental conditions－Part 3：Classification of groups of environmental parameters and their severities－Section 2：Transportation