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NEMA Enclosures

What is a NEMA Rating?

The NEMA enclosure ratings, are performance standards set by the National Electrical Manufacturers Association (NEMA). They have entered the vocabulary of electrical enclosures users so fully that the use of the terms NEMA 3R, NEMA 4X and others have become practically generic. While the terms may be standard, not every NEMA enclosure is created equal. At every performance level, Bison ProFab NEMA enclosure products offer the extra durability and consistent manufacturing quality that comes from applying the latest in manufacturing equipment and decades of enclosure building experience. Click below to learn more about our full line of NEMA enclosures, affordably priced yet superior in quality.

NEMA Rating for Enclosures

NEMA RatingNEMA DefinitionIP EquivalentIP Definition
NEMA 1 » Nema 1 enclosures are a general purpose enclosures that are typically manufactured to protect live parts, controls and terminations from contact with personnel and foreign objects in industrial applications. IP10 1 = Protection from Large foreign objects diameter >50mm (Object or tool the size of of the back of hand) 0 = Not Protected
NEMA 2 » Nema 2 enclosures offer the same level of protection as Nema 1, with the main difference being that Nema 2 enclosures are drip-tight. Nema 2 enclosure would protect electrical components from falling or splashing water that may be caused by conditions that have high condensation, such as cooling rooms or laundry rooms. IP11 1 = Protection from Large foreign objects diameter >50mm (Object or tool the size of of the back of hand) 1 = Protection from dripping water
NEMA 3 » Nema 3 enclosures are weather resistant, and include a degree of protection from windblown dust and ingress of water in the forms of rain, sleet and snow. A Nema 3 rated enclosures will also remain undamaged from the formation of ice on the enclosure. IP54 5 = Protected against dust - Limited to ingress (no harmful deposit) 4 = Spraying water from all directions, (limited ingress permitted)
NEMA 3R » Nema 3R enclosures are designed very similar to Nema 3 enclosures, however 3R enclosures can be ventilated. When ventilated, the degree of protection provided by Nema 3R enclosures against windblown dust is diminished. IP14 1 = Protection from Large foreign objects diameter >50mm (Object or tool the size of of the back of hand) 4 = Spraying water from all directions, (limited ingress permitted)
NEMA 4 » NEMA 4 provide a watertight protection against splashing water, indoor wash down from a commercial hose as well as ingress protection from dirt, rain, sleet, snow, ice and windblown dust. IP66 6 = Complete protection from solid objects of any kind. 6 = Protected from high pressure jets from all directions, (limited ingress permitted)
NEMA 4X » NEMA 4X enclosures are typically used in extreme, harsh, and corrosive environments that exceed the capabilities of Nema 4 enclosures. Nema 4X enclosures are generally manufactured using 304 & 316 stainless steel. IP66 6 = Complete protection from solid objects of any kind. 6 = Protected from high pressure jets from all directions, (limited ingress permitted)
NEMA 12 » Nema 12 enclosures are dust tight enclosures and are constructed without punch outs. Built for indoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment; to provide a degree of protection against falling dirt; against circulating dust, lint, fibers, and flying; and against dripping and light splashing of liquids IP52 5 = Protected against dust - Limited to ingress (no harmful deposit) 2 = Protected against direct sprays of water up to 15° from the vertical.
NEMA 13 » Nema 13 enclosures are built to withstand indoor industrial applications that require the protection from dust, lint, splashing oil & non-corrosive liquids. IP54 5 = Protected against dust - Limited to ingress (no harmful deposit) 4 = Spraying water from all directions, (limited ingress permitted)

NEMA Enclosure Engineering

At Bison Profab we believe that fabrication should meet application and ensure the correct enclosure rating for your industrial needs. We have the capabilities to design and manufacture NEMA enclosures that are also UL certified in both the US and Canada. Before we begin the fabrication of an electrical enclosure, we communicate with our customers in order to understand the application and environmental hazards to be encountered, in order to suggest the appropriate NEMA Rating needed. We can help you design an enclosure that will withstand exposure to to a variety of environments, from rugged industrial settings to harsh corrosive weather conditions. Our NEMA 4 enclosures are built to protect your electrical components from worksite incidents, such as splashing water and indoor washdowns as well as outdoor elements like rain, sleet, snow, airborn dust, etc. We have years of experience in designing and fabricating NEMA enclosures to the highest standards at a competitive price.

Enclosure Accessories

All of our enclosures can be custom fabricated to maintain your protection requirements and functionality by adding any the following accessories:

Temperature & Air ControlLighting & InteriorMounting & Exterior
» Thermostats » Power Supply » U-bolts
» Sun Shields » Enclosure Lights » Lifting Eyes
» Enclosure Breathers » Light Switches » Casters & Wheels
» Insulation » Viewing Windows » Vibration Control
» Heaters » EIA Racks » Back Plates/Sub-Panels
» Air Conditioners » Shelves
» Axial Fans » Slide-out Drawers
» Vents & Air Filters

IP Ratings Calculator

Bison provides a resource that quickly explains the protection that each IP enclosure would give, the weather conditions that it could withstand and an equivalent NEMA rating that Bison could then specifically manufacture in order to replace it.

IP Enclosure Ratings Calculator

NOTE: This is a cross reference for comparing NEMA and IECEE's IP enclosure ratings. This comparison is only approximate, and it is the responsibility of the user to verify the enclosure rating necessary for the given application.

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Working out of Houston, TX to supply & manufacture the highest quality electrical enclosures Worldwide.

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