The protection ratings for enclosures defined by UL, CSA, and NEMA are categorized as follows. While the classifications are generally similar, there are minor differences in the details, so it is advisable to refer to the specific standards for more precise information.
| Type | Classification | Definition |
|---|---|---|
| 1 | General | For indoor use, providing protection for enclosed components under normal conditions, without abnormal usage environments. |
| 2 | Drip-Proof | For indoor use, providing protection in environments with limited amounts of falling water or dust. |
| 3 | Rainproof, Dustproof, Sleet (Ice) | For outdoor use, offering protection against wind-driven dust, rain, and sleet; condensation ice on the surface of the enclosure will not damage the product. |
| 3S | Rainproof, Dustproof, Sleet (Ice) | For outdoor use, providing a certain level of protection against wind-driven dust, heavy rain, and sleet; the product remains operational even when covered in snow and ice. |
| 3R | Rainproof, Sleet (Ice) Resistant | For outdoor use, offering protection against rain and sleet, with minimal impact from ice buildup on the surface. |
| 4 | Watertight and Dustproof | For indoor or outdoor use, providing protection against rain, splashing water, and hose-directed water; condensation ice on the surface will not damage the product. |
| 4X | Waterproof, Dustproof, Corrosion-Resistant | For indoor or outdoor use, offering protection against rain, splashing water, and hose-directed water; condensation ice on the surface will not damage the product; corrosion-resistant. |
| 6 | Submersible | For indoor or outdoor use, providing protection against water ingress during temporary submersion at limited depths (6 feet, 30 minutes). |
| 6P | Submersible | For indoor or outdoor use, providing protection against water ingress during temporary submersion at limited depths (6 feet, 24 hours). |
These ratings help determine the level of protection enclosures provide against environmental factors such as water, dust, and mechanical impact, ensuring safe and reliable operation of electrical and electronic equipment in various industrial settings.
