GB/T 20159.3-2011

This standard provides guidance on correlating and transforming environmental condition classes for equipment intended for stationary use in weatherprotected locations, such as indoor industrial facilities, warehouses, or sheltered areas. It is applied by engineers and testers to map real-world environmental parameters (e.g., temperature, humidity) to standardized test conditions, ensuring product reliability testing aligns with expected service environments. The standard is primarily used in product design, qualification testing, and procurement specifications for electrical, electronic, and mechanical equipment operating in protected indoor settings.