PD IEC TS 62271-304:2019 High-voltage switchgear and controlgear Classification of indoor enclosed switchgear and controlgear for rated voltages above 1 kV up to and including 52 kV related to the use in special service conditions with respect to condensation and pollution

Pollution
Indoor electric equipment
Switchgear
Rated voltage
Electrical equipment
Electric control equipment
Protected electrical equipment
Classification systems
Condensation
Testing conditions
Environment (working)
Insulating enclosures
High-voltage equipment

Link: PD IEC TS 62271-304:2019 High-voltage switchgear and controlgear Classification of indoor enclosed switchgear and controlgear for rated voltages above 1 kV up to and including 52 kV related to the use in special service conditions with respect to condensation and pollution
Source: BSI Standards