What type of NEMA enclosure is both watertight and corrosion-resistant?

The NEMA 4 enclosure is specifically designed to provide a high level of protection against water and dust, making it both watertight and corrosion-resistant. This type of enclosure is commonly used in outdoor settings and industrial environments where exposure to moisture and corrosive materials can be an issue.

NEMA 4 enclosures typically feature gaskets that seal the enclosure, preventing water and other contaminants from entering. This makes them suitable for applications in areas subject to rain, splashing, and hose-directed water, ensuring that the internal components remain safe and functional.

In contrast, other types of enclosures such as 3R are designed to provide protection against rain and are generally less protective compared to NEMA 4. Enclosures labeled as 3S, while also designed for outdoor use, may not meet the same level of watertight and corrosion-resistant specifications as a NEMA 4. The NEMA 1 enclosure offers minimal protection, mainly against dust and contact, lacking the water resistance required for harsher environmental conditions.

Thus, NEMA 4 is the most suitable choice when requiring an enclosure that is both watertight and capable of resisting corrosion, making it the optimal option in this context.