BS IEC 60721-3-3. Classification of environmental conditions. Part 3. Classification of groups of environmental parameters and their severities. Section 3. Stationary use at weather protected locations— 19 стр.
BS EN 60721-3-4. Classification of environmental conditions. Part 3. Classification of groups of environmental parameters and their severities. Section 4. Stationary use at non-weather protected locations— 17 стр.
