BS EN IEC 60721-3-4:2019废止
Classification of environmental conditions. Classification of groups of environmental parameters and their severities. Stationary use at non-weatherprotected locations
出版：British Standards Institution
专家解读视频
This part of IEC 60721 classifies groups of environmental parameters and their severities to which products are subjected when installed for stationary use at non-weatherprotected locations.
IEC 60721-3-4:2019 - Identical
EN IEC 60721-3-4:2019 - Identical
IEC 60721-3-4 : 2019 - Identical
EN IEC 60721-3-4:2019 - Identical
