BS EN IEC 60721-3-4:2019 Classification of environmental conditions Classification of groups of environmental parameters and their severities. Stationary use at non-weatherprotected locations

Climate
Grades (quality)
Environment (working)
Classification systems
Electrical components
Stationary
Electrical equipment
Electronic equipment and components

Link: BS EN IEC 60721-3-4:2019 Classification of environmental conditions Classification of groups of environmental parameters and their severities. Stationary use at non-weatherprotected locations
Source: BSI Standards