NEMA Type Rating Testing/Electrical Enclosure Ratings as per NEMA 250, UL50e, & CSA C22.2 94
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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.
NEMA 250 Indoor Type Ratings
| Indoor Type Ratings | Type 1 | Type 2 | Type 4 | Type 4X | Type 5 | Type 6 | Type 6P | Type 12 | Type 12K | Type 13 |
|---|---|---|---|---|---|---|---|---|---|---|
| Access to hazardous parts | X | X | X | X | X | X | X | X | X | X |
| Ingress of solid foreign objects (falling dirt) | X | X | X | X | X | X | X | X | X | X |
| Ingress of water (dripping and splashing) | X | X | X | X | X | X | X | X | X | |
| Ingress of solid foreign objects (circulating dust) | X | X | X | X | X | X | X | |||
| Ingress of solid foreign objects ( settling dust) | X | X | X | X | X | X | X | X | ||
| Ingress of water (hosedown) | X | X | X | X | ||||||
| Oil and coolant seepage | X | X | X | |||||||
| Oil or coolant spraying and splashing | X | |||||||||
| Corrosive Agents | X | X | ||||||||
| Ingress of water (temporary submersion) | X | X | ||||||||
| Ingress of water (prolonged submersion) | X |
NEMA 250 Outdoor Type Ratings
| Indoor/Outdoor Type Ratings | Type 3 | Type 3X | Type 3R | 3RX | Type 3S | Type 3SX | Type 4 | Type 4X | Type 6 | Type 6P |
|---|---|---|---|---|---|---|---|---|---|---|
| Access to hazardous parts | X | X | X | X | X | X | X | X | X | X |
| Ingress of solid foreign objects (falling dirt) | X | X | X | X | X | X | X | X | X | X |
| Ingress of water (dripping and splashing) | X | X | X | X | X | X | X | X | X | X |
| Ingress of water (rain, snow, sleet) | X | X | X | X | X | X | X | X | X | X |
| Sleet | X | X | ||||||||
| Ingress of solid foreign objects (windblown dust) | X | X | X | X | X | X | X | X | ||
| Ingress of water (hosedown) | X | X | X | X | ||||||
| Corrosive Agents | X | X | X | X | X | |||||
| Ingress of water (temporary submersion) | X | X | ||||||||
| Ingress of water (prolonged submersion) | X |
Other Ingress Protection Test Standards Available
Ingress Protection
NEMA 250, Section 5; UL50
UL50E
CSA C22.2 No. 94.1, 94.2
EN50436-1
EIA/ECA-364-10E
EIA-364-50B, Fine Sand
RTCA/DO-160G Sec12.0
Water Test/Rain, Ingress Protection, Icing/Freezing Rain
MIL-STD-810, M521, Icing & Freezing Rain
IEC/EN 60068-2-18
IEC/EN 60068-2-68
IEC/EN 60950-22
MIL-STD-202, M106
MIL-STD-810, M506.1
MIL-STD-810, M510.5
MIL-STD-810, M512.5
MIL-STD-883, M1002
RTCA/DO-160 Sec10.0
RTCA/DO-160, Section 24.0;
MIL-STD-810, Section 521
