Basic Knowledge of Corrosion Protection Grades
Release Time:
2025-07-17
3K5L: The conditions of this level apply to certain workshops, factories, unattended machine rooms, etc. The aforementioned usage locations generally have no temperature or humidity control, but heating devices may be used when there is a significant temperature difference between indoors and outdoors. Products in use will be affected by sunlight radiation, heat radiation, air flow (wind), condensation, and water other than rainfall, but are not affected by natural precipitation and freezing.
Indoor and Outdoor Corrosion Protection Classification for Electrical Products
| F1 | F2 | W | WF1 | WF2 |
| Indoor Moderate Corrosion Protection | Indoor Strong Corrosion Protection | Outdoor Light Corrosion Protection | Outdoor Moderate Corrosion Protection | Outdoor Strong Corrosion Protection |
Climate Environmental Condition Levels and Biological Environmental Condition Levels
| Electrical Protection Types | Indoor | Outdoor | ||||||
| F1 | F2 | W | WF1 | WF2 | ||||
| Environmental Parameters | Environmental Parameters | |||||||
| 3K5L | 4K1 | 4K2 | 4K1 | 4K2 | 4K1 | 4K2 | ||
| Low Temperature (℃) | -5 | -20 | -35 | -20 | -35 | -20 | -35 | |
| High Temperature (℃) | +40 | +40 | ||||||
| Maximum Relative Humidity (%) | 95 | 100 | ||||||
| Solar Radiation (W/m²) | - | 1120 | ||||||
| Surrounding Air Movement (m/s) | 10 | 30 | ||||||
| Condensation | Yes | Yes | ||||||
| Rainfall Intensity (mm/min) | - | 6 | ||||||
| Freezing and Condensation Conditions | - | Yes | ||||||
| Splashing Water | Yes | Yes | ||||||
| Dripping Water | Yes | - | ||||||
| Mold and Fungi | Yes | Yes | ||||||
| Harmful Animals | Yes | Yes | ||||||
Note: Explanation of Climate Environmental Condition Levels
3K5L: Conditions of this level apply to certain workshops, factories, unattended machine rooms, etc. These usage locations generally have no temperature or humidity control, but heating devices may be used when there is a large temperature difference between indoors and outdoors. Products in use are affected by sunlight radiation, heat radiation, air flow (wind), condensation, and water other than natural precipitation and freezing; however, they are not affected by natural precipitation and freezing.
4K1: This level applies to products directly exposed in unprotected locations with "warm temperate" and "subtropical humid" climate types.
4K2: This level applies to products directly exposed in unprotected locations with four climate types: "cold temperate", "warm temperate", "dry hot", and "subtropical humid".
Chemical Active Substance Environmental Condition Levels
| Electrical Protection Types | Indoor | Outdoor | |||
| F1 | F2 | W | WF1 | WF2 | |
| Chemical Active Substance Environmental Condition Levels | 3C3 | 3C4 | 4C2 | 4C3 | 4C4 |
| Chemical Active Substances | Content (mg/m³) (Average) | ||||
| Salt Spray | Yes | ||||
| Sulfur Dioxide | 5.0 | 13 | 0.3 | 5.0 | 13 |
| Hydrogen Sulfide | 3.0 | 14 | 0.1 | 3.0 | 14 |
| Chlorine | 0.3 | 0.6 | 0.1 | 0.3 | 0.6 |
| Hydrogen Chloride | 1.0 | 3.0 | 0.1 | 1.0 | 3.0 |
| Hydrogen Fluoride | 0.05 | 0.1 | 0.01 | 0.05 | 0.1 |
| Ammonia | 10 | 35 | 1.0 | 10 | 35 |
| Ozone | 0.1 | 0.2 | 0.05 | 0.1 | 0.2 |
| Nitrogen Oxides | 3.0 | 10 | 0.5 | 3.0 | 10 |
Note: Explanation of Chemical Active Substance Environmental Condition Levels
4C2: This level applies to areas with general pollution, chemical active substances distributed throughout the region or in towns with heavy traffic. The concentration of chemical gases in the environment is low, but sometimes pungent odors can be detected.
3C3, 4C3: These two levels apply to locations near industrial production areas with chemical pollutants or directly in industrial production areas. The environment contains moderate concentrations of chemical gases, and people often feel chemical irritation.
3C4, 4C4: These two levels apply to industrial production areas where high concentrations of chemical pollutants may occur. The chemical gases in the environment strongly irritate humans, and protective equipment is sometimes required to work on site.
Mechanical Active Substance Environmental Condition Levels
| Electrical Protection Types | Indoor | Outdoor | |||
| F1 | F2 | W | WF1 | WF2 | |
| Mechanical Active Substance Environmental Condition Levels | 3S3 | 3S4 | 4S2 | 4S3 | 4S4 |
| Mechanical Active Substances | Content (Average) | ||||
| Sand (mg/m³) | 300 | 3000 | 300 | 1000 | 4000 |
| Suspended Dust (mg/m³) | 0.4 | 4.0 | 5.0 | 15 | 20 |
| Settled Dust (mg/m³) | 350 | 1000 | 500 | 1000 | 2000 |
Note: Explanation of Mechanical Active Substance Environmental Condition Levels
3S3: This level applies to locations near sources of sand, dust, or industrial dust, or geographically located in areas with windblown sand or dusty air with climate protection.
3S4: This level applies to locations producing industrial dust during processing or geographically located in windy sandy or dusty areas with climate protection.
4S2: This level applies to unprotected locations in areas with sources of sand, dust, or industrial dust.
4S3: This level applies to locations near sources of sand, dust, or industrial dust, or geographically located in areas with windblown sand or dusty air without climate protection.
4S4: This level applies to unprotected locations geographically or due to production conditions where the air frequently contains high amounts of sand, dust, or industrial dust.
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