NEMA Enclosure Testing

NEMA Type Rating Testing/Electrical Enclosure Ratings as per NEMA 250, UL50e, & CSA C22.2 94

We are experts in NEMA ratings, including 3R, 4X, and CSA C22.2 No. 94.2, and have a deep understanding of the requirements for each rating. Our state-of-the-art equipment and rigorous testing processes ensure that your products meet or exceed industry standards.

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What Is NEMA/What are NEMA Type Ratings?

The National Electrical Manufacturers Association (NEMA) provides standards for the design and construction of electrical enclosures. NEMA designations are a way of classifying the degree of protection provided by an enclosure against environmental hazards such as dust, water, and impact. The NEMA designation chart is a valuable tool for engineers, contractors, and facility managers to determine the appropriate enclosure rating for their electrical equipment.

What are some of the most common NEMA Type Ratings?

NEMA 1 enclosures are intended for indoor use only and provide a basic level of protection against contact with live parts. NEMA 3R rated enclosures are intended for outdoor use and provide protection against rain, sleet, and snow. NEMA 3 rated enclosures offer the same protection as NEMA 3R, but are also suitable for indoor use. NEMA 4 rated enclosures provide protection against water, wind-driven rain, sleet, snow, wind, and falling ice. NEMA 4X enclosures provide the same protection as NEMA 4, but with added corrosion resistance.

How is UL50e Different from NEMA?

The UL 50E standard defines the requirements for electrical enclosures that are intended for use in ordinary (non-hazardous) locations. UL 50E covers the safety, performance, and environmental requirements of enclosures and the electrical equipment housed within them.

What does the X designation mean in a NEMA Type Rating?

NEMA testing involves evaluating the performance of an enclosure under specific environmental conditions and verifying that it meets the specified NEMA rating. NEMA X testing is a more rigorous test procedure that includes a salt spray test to evaluate the corrosion resistance of the enclosure.

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NEMA 250 Indoor Type Ratings

Indoor Type RatingsType 1Type 2Type 4Type 4XType 5Type 6Type 6PType 12Type 12KType 13
Access to hazardous partsXXXXXXXXXX
Ingress of solid foreign objects (falling dirt)XXXXXXXXXX
Ingress of water (dripping and splashing)XXXXXXXXX
Ingress of solid foreign objects (circulating dust)XXXXXXX
Ingress of solid foreign objects ( settling dust)XXXXXXXX
Ingress of water (hosedown)XXXX
Oil and coolant seepageXXX
Oil or coolant spraying and splashingX
Corrosive AgentsXX
Ingress of water (temporary submersion)XX
Ingress of water (prolonged submersion)X

NEMA 250 Outdoor Type Ratings

Indoor/Outdoor Type RatingsType 3Type 3XType 3R3RXType 3SType 3SXType 4Type 4XType 6Type 6P
Access to hazardous partsXXXXXXXXXX
Ingress of solid foreign objects (falling dirt)XXXXXXXXXX
Ingress of water (dripping and splashing)XXXXXXXXXX
Ingress of water (rain, snow, sleet)XXXXXXXXXX
Ingress of solid foreign objects (windblown dust)XXXXXXXX
Ingress of water (hosedown)XXXX
Corrosive AgentsXXXXX
Ingress of water (temporary submersion)XX
Ingress of water (prolonged submersion)X