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When protecting outdoor electronics, your choice of enclosure is more than just a box, it’s a critical component of the system’s longevity. Outdoor environments are truly unforgiving including being around moisture, dust, and extreme temperature swings that can degrade sensitive components if the housing isn’t up to the task. At its core, IP67 is a standard defined by the International Electrotechnical Commission (IEC) that classifies the degree of protection an enclosure provides against “ingress.”

If you work with electrical equipment outdoors, you’ve probably come across the term “NEMA 3” more than once. It’s one of the most popular enclosure ratings in the industry — but with subtypes like 3R, 3S, and 3X in the mix, it’s easy to feel lost. Here’s a straightforward guide to what NEMA 3 enclosures do, how they’re tested, and what sets each subtype apart. NEMA ratings are set by the National Electrical Manufacturers Association and define how well an enclosure protects the equipment inside from environmental hazards.

When specifying electrical enclosures for wet or outdoor environments, understanding NEMA ratings ensures equipment protection and longevity. Two commonly specified ratings—NEMA 6 and NEMA 6P—offer robust water protection, but knowing the distinction can prevent costly equipment failures or over-specification. NEMA 6 is a rating established by the National Electrical Manufacturers Association indicating an enclosure’s ability to protect electrical equipment in wet locations. This rating confirms that an enclosure can withstand rain, washdowns, and temporary submersion in water.