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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.

NEMA 4 and NEMA 4X are two of the most commonly specified enclosure ratings, and on the surface, they look nearly identical. They share a lot of common ground, but there’s one critical distinction that can make or break a design in the wrong environment. NEMA 4X does everything NEMA 4 does, and then it adds one more layer of protection: corrosion resistance. That single addition is what sets the two ratings apart, and it’s more significant than it might initially sound.

By Josiah Haas, President, Bud Industries – Sensitive electronic equipment is vulnerable to relentless attacks from the elements when deployed outdoors. Rain penetrates vulnerable circuits, dust clogs vents, UV radiation degrades plastic components, and temperature fluctuations stress delicate connections. Without adequate protection, expensive electronics that are designed to operate for years can fail within months, resulting in costly replacements, emergency repairs, and critical system downtime. This is where weatherproof enclosures become indispensable.