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Variety of NEMA Enclosures
  • IP 65
  • IP 66
  • SGS

Your Best NEMA 3R Enclosure Manufacturer in China

  • KDM NEMA 3R enclosure is intended for outdoor use primarily to provide additional protection to the components against rain, sleet, snow, water, dust and damage from external ice formation.
  • KDM NEMA 3 enclosure is commonly used in switch gears, lighting contractors, power distribution, housing and other electrical appliances that require protection in an outdoor environment that were mention above.
  • stainless steel nema 3R junction box and enclosure
  • stainless steel Nema 3R electrical enclosure with window
  • Galvanized Steel nema 3R enclosure with window
  • double door stainless steel nema NEMA 3R vfd enclosure

KDM NEMA 3R Enclosure Manufacturing Capacity to Boom Your Business

Electrical Enclosure laser-cutting
NEMA 3R Enclosure Laser Cutting

4000W high performance laser cutting machine, +/- 0.05mm accuracy. No burr, no scratching.

Electrical Enclosure Welding
NEMA 3R Enclosure Welding

Multi-Functioning flexible welding equipment, high accuracy, no deformation.

Electrical Enclosure Bending
NEMA 3R Enclosure Bending

+/- 0.5mm bending precision, smooth surface without bending marks.

Electrical Enclosure Polishing
NEMA 3R Enclosure Polishing

10+ welding experience workers, perfect overall appearance.

Electrical Enclosure Foaming
NEMA 3R Enclosure Foaming

High speed and accuracy foaming machines, fast and qualified Gasket

electrical enclosure assembly
NEMA 3R Enclosure Assembly

Expert assembling team, consistent assembly quality on every KDM enclosure

Recent NEMA 3R Electrical Enclosure Order

NEMA 4 weatherproof carbon steel junction box
Single door electrical enclosure
Single door wall mount electrical enclosure
Hinge cover wall mount electrical enclosure
steel free standing enclosure

Questions You May Ask About Our NEMA 3R Electrical Enclosure

Material of KDM NEMA 3R Enclosure

We use the 316 stainless steel, 304 stainless steel, carbon steel as the enclosure panel.

Precision of KDM NEMA 3R Enclosure

We make +/- 1mm tolerance for overall NEMA 3R and other enclosure size

Standard Structure and Parts

Gland plate, radiating fan, fluorescent lamp, lamp switch, ground connections, PU foaming seals.

Warranty for NEMA 3R Enclosure

We provide 1 year warranty for KDM NEMA enclosure, you will get free enclosure accessories within our warranty.

KDM NEMA 3R Enclosure

Apart from the protection, KMD NEMA 3R enclosure offers from the environmental factors, NEMA type 3R enclosures from KDM is able to protect the live appliances from high water levels in case of floods. It has a provision for drainage, alternate latching and locking mechanisms.

NEMA 3R Enclosure

Somehow, KDM NEMA 3R enclosure can be used in indoor environments, it protects against dripping water and provides much more protection to personnel against incidental contact with enclosed equipment. Besides, the protection against any form of contact with the material that has been enclosed.

KDM NEMA 3R enclosure does not have a gasket sealing surface. Some models have hasps for padlocking, new models include galvanized steel units and larger sizes with hinge covers.

NEMA 3R enclosures are designed very similar to NEMA 3 enclosures, however, 3R enclosures can be ventilated. Enclosure ventilation is typically accomplished through the use of louvered openings to filter the air within the enclosure, and necessary for a vented battery enclosure. When ventilated, the additional protection provided by NEMA 3R enclosures against windblown dust lessen.

NEMA 3R Enclosure manufacturing

At KDM, we produce and designed high-quality NEMA 3 enclosures to withstand tough environments. We have a variety style, sizes, types, and materials NEMA 3 enclosure for you to choose from, all at affordable costs. For even more options, such as alternate locking, latching mechanisms, and more, you can select from our wide selection of enclosure that exceeds NEMA 3R rating.

KDM NEMA 3 enclosure offers unbeatable value in the market. Our NEMA 3R enclosure conforms to the NEMA 250-2014, RoHS, CE, ATEX, IECEx, EN / IEC 60529 and CSA for electrical enclosures.

KDM NEMA 3R enclosure manufactured using advanced technology and automated tools. Set standards materials for electrical and telecommunications equipment. This improves safety, economics, and communication for us as a manufacturer as well as the user. For custom NEMA 3 enclosure, you can send us specific sizes, lay outs, and designs. Furthermore, KDM offers custom powder coating and silk-screening.

NEMA 3R Enclosure material

KDM as a professional NEMA enclosure manufacturer, an expert in manufacturing enclosure depending on client’s requirement and applications. For the past 10 years, we have worked with thousands of clients. We have the expertise to help you with each stage of the process.

At KDM, you can easily find the right NEMA 3R enclosure solutions for your needs. We also provide custom NEMA 3R enclosure to provide what exactly you need. No matter what your design requirements are, we can help you develop the perfect NEMA 3 enclosure that fits your needs and work well for your business. Take the frustration out of the side of your business and rely it on us, contact us today!

The Definitive FAQ Guide to NEMA 3R Enclosures

What does NEMA Type 3R mean?

NEMA stands for National Electrical Manufacturers Association.

NEMA Type 3R is meant for use both indoors and outdoors. 

The enclosure protects inside equipment from snow and sleet, and guarantees that everything will work even if the enclosure is covered with ice.  

Also, 3R enclosures guarantee that any external mechanisms covered in ice will still work well.

How is NEMA 3R different from NEMA 3, 3S, 3X, etc?

NEMA 3R is the same as NEMA 3, except it does not offer as much protection against windblown dust, so it is better for cold inside applications like freezer rooms.

This is because 3R usually lack a few gaskets that other NEMA 3 enclosures have.

NEMA 3S is the same as NEMA 3R, but also ensures that any external mechanism is still operable when covered with ice. 

NEMA 3RX includes added protection against corrosion.

There could also be enclosures with a subtype rating NEMA 3SX.

Subtypes of NEMA 3

Subtypes of NEMA 3

How are NEMA 3R enclosures structurally different from NEMA 3?

NEMA 3R enclosures have drainage openings that prevent accumulation of liquid at the bottom of the enclosure.

This, along with a lack of some sealing gaskets, leads 3R to be vulnerable towards windblown dust. 

Are NEMA 3R enclosures used outdoors?

Yes and no. 

NEMA 3R enclosures do protect against water ingress, as well as snow and sleet, but not from windblown dust.

Thus, it is more suitable for cold indoor applications.

Do NEMA 3R enclosures protect from corrosion?

NEMA Type 3R enclosures do not protect against corrosion well, as they are. 

However, you can increase the enclosure’s resistance to corrosion with the material you request.

Galvanized steel and stainless steel are the best options.

Also, powder and enamel coatings can help deter corrosion. 

Also, you can order NEMA 3RX enclosures, which include protection against corrosion. 

What are common applications for NEMA 3R enclosures?

NEMA 3R enclosures are great for indoor and outdoor commercial uses. 

These may be junction boxes, utility boxes, outdoor meter cabinets, transformers, generator skids, frequency converters, power conditioners, switch gears, lighting contractors, power distribution, and rotating equipment. 

Typical NEMA 3R box

Typical NEMA 3R box

Because of this type’s resistance to water and ice, such enclosures are great for commercial freezer rooms, ship docks, subway systems, outdoor construction sites, and anywhere else where it gets cold.

However, because 3R is not well protected against dust, indoor applications are more recommended.

For more information, check out our NEMA enclosure FAQ!

How are NEMA 3R enclosures tested?

NEMA enclosures are not tested by NEMA, but by third-party laboratories. 

NEMA labels can be used to self-declare enclosure ratings.

NEMA 250 outlines all the extensive tests that enclosures undergo to achieve a NEMA label. 

For NEMA 3R, one of the tests is the rod entry test, which involves inserting a rod of different diameters into openings and vents of the enclosure in an attempt to reach live parts of the circuit. 

NEMA 3R enclosures also undergo a rain test for 1 hour.

Rain test chamber

Rain test chamber

The test is considered passed if there is no significant water accumulation inside the enclosure.

NEMA 3R enclosures are further tested with an external icing test and outdoor corrosion test. 

External icing test involves spraying the enclosure with water and then cooling down the room until 20mm of ice has formed over the enclosure.

Outdoor icing test

 Outdoor icing test

The enclosure should be undamaged and operable at the end of the test.

Outdoor corrosion test is included for NEMA Types 3X, 3RX, and 3SX. 

It involves making a 5% saline solution (using sodium chloride) and spraying it continuously for 600 hours (25 days).

How can I be sure of the quality of NEMA 3R enclosures?

At KDM, we have the ISO9001 certification that you can look through.

Also, you can do independent third-party testing of the enclosures if you want confirmation of quality and conformity assessment. 

What is NEMA 3R in IP standards?

Although it is difficult to translate one set of standards into another, NEMA Type 3R is roughly comparable to IP14 and IP24.

Both provide good protection against dust and water.

NEMA and IP

  NEMA and IP 

What are common designs for NEMA 3R enclosures?

Some common designs for NEMA 3R enclosures include free-standing, floor-mounted, wall-mounted, and pole-mounted.

Free-standing, floor-mounted, and walk-in enclosures are used for bigger equipment. 

They can have one or multiple doors, depending on your requirements.

Such enclosures can also have pedestals, casters, leveling feet, and lifting eyes to help install and move it around.

Multi-door free-standing enclosure

Multi-door free-standing enclosure

Wall-mounted and pole-mounted NEMA 3R enclosures are typically small and house fuses and switches. 

These are less mobile, but take up less space as well.

They are installed using special brackets that can be just external or have internal elements too. 

Wall-mounted fuse box

Wall-mounted fuse box 

Overall, higher NEMA ratings benefit from U-shaped designs since those require less seam welding, which works well with ice and corrosion protection

U-shaped enclosure (top part)

U-shaped enclosure (top part)

Of course, we also offer custom enclosures

What additional features are often included?

You can request vents, windows, hinged doors, locks, cable management systems, and much more. 

Vents, as well as radiating fans, provide a path for heat to escape through, cooling electrical components of the enclosure. 

Vents provide a more passive flow of air, whereas fans actively move air and are used to cool down equipment that heats up quickly.

You can request a heating fan that will not only move air in and out of the enclosure, but also heat it up in very cold environments.

This prolongs their life and decreases the possibility of malfunctions. 

Radiating fan in an enclosure

 Radiating fan in an enclosure

These also stabilize air pressure inside the enclosure, preventing condensation which can damage the electrical components of the enclosure. 

Windows help personnel examine the electrical components in a quick and non-invasive way. 

And if something goes wrong, a window helps to see what is happening right away. 

Plus, infra-red windows help protect workers from arc flash accidents by letting them see heat buildup. 

Enclosure with a window and a lock

 Enclosure with a window and a lock

Hinged doors control how and how much the door or cover of the enclosure opens. 

This also includes a variety of handles that you can request as well. 

You can choose between continuous, offset, and other types of hinges.

Locks, latches, and clamps add a layer of security to your NEMA 3R enclosure, making sure no one tampers with it or accidentally accesses its electrical components.

Cable management systems may involve hooks, racks, and other organizing features. 

We also offer secondary features like casters, lifting eyes, file pockets, drip caps, switches, lights, and anything else you request. 

File pocket

  File pocket

Casters help move the enclosure around; lifting eyes are for heavy enclosures that need to be lifted to be carried around; file pockets store operating manuals; drip caps protect the enclosure from splashing water; solar shields protect against UV rays; switches and lights help operate the equipment inside the enclosure. 

Do knockouts, vents, fittings, etc. affect the rating of the enclosure?

Individual fittings, vents, knockouts, etc – ideally – should have a better NEMA rating than the enclosure. 

But generally this is not possible, so these features should have the same rating as the overall structure.

This means that if you request a NEMA 3R enclosure with such features, the resulting enclosure will still be rated 3R.

Can NEMA 3R enclosures protect from cold?

Generally, enclosures can have air conditioners, coolers, heat exchangers, and heater strips to control the temperature inside the enclosure. 

This is done to prevent the equipment from freezing over, getting slower or fragile, but also to prevent condensation.

Heat exchangers are closed loop systems that are easy to maintain.

They push hot air in colder compartments, which results in an equalized temperature and pressure.

Heat exchanger

Heat exchanger

Heater strips use electricity to heat up the air inside the enclosure. 

Heater Strip

Heater strip

There can also be fan filters and small positive temperature coefficient heaters.

Enclosure heaters range in performance from 50 to 1200 Watts, depending on the size of your enclosure. 

What materials are used for NEMA 3R enclosures?

The materials used for NEMA 3R enclosures aren’t different from materials used for other types of enclosures. 

They can be made from carbon steel, galvanized steel, and stainless steel – usually of the grades 304 or 316. 

Carbon steel is usually duller than stainless steel. 

It is also magnetic and more malleable since it only has iron and carbon. 

This type of steel is vulnerable to corrosion, so it is not recommended for NEMA 3R.

Stainless steel is created by adding chromium, nickel, and molybdenum to the iron-carbon alloy. 

Stainless steel vs. galvanized steel

 Stainless steel vs. galvanized steel

Steel grades 304 and 316 differ in the content of all additives. 

For NEMA 3R enclosures, stainless steel grade 304 is most recommended. 

Galvanized steel is coated with a protective layer of zinc that prevents corrosion. 

This type of steel is more expensive and heavier than stainless steel. 

Another type of steel that can be used is cold-rolled steel, which is thinner and more dense than normal steel – and thus, it is stronger.

When using steel, the manufacturer should keep in mind a certain gauge, or thickness, of the sheet metal that is necessary to comply with NEMA standards. 

NEMA 3R enclosures use 12-14 gauge steel, which is about 1.9-2.6 mm.

Fiberglass is another possible material you can request.

It is very strong, can dissipate heat and insulate electricity, lowering the effect of interference and the possibility of shocking personnel. 

Fiberglass enclosure

 Fiberglass enclosure

Enclosures can also be made from aluminum alloys. 

Just like steel grades, aluminum alloys can be either of the 5052 or the 6061 series. 

Aluminum vs stainless steel

 Aluminum vs stainless steel

Both are lightweight, but 5052 is more weldable, whereas 6061 has a higher resistance to corrosion. 

Also, 6061 is more expensive.

This material is especially good for enclosures exposed to solvents, petrochemicals, some acids, most sulfates and nitrates.

If you need such protection, then NEMA 3RX with aluminum would be great.

Also, our windows are made from polycarbonate and ABS. 

Polycarbonate is more resistant to corrosion, whereas ABS is cheaper. 

If you would like to learn more, send in your inquiry now for a consultation!

What paints and coatings can be used for NEMA 3R enclosures?

Our enclosures are well-protected, but the right coating can add its protection as well. 

You can choose enamel or powder paint coats in any color. 

Enamel paint has a glossy finish and adds weather resistance. 

Powder paint is deposited with the electrostatic force, and is quicker and easier than enamel. 

It is also more flexible in appearance, giving you the option of glossy and matte finishes.

Powder coating finishes

Powder coating finishes

We also offer anodizing and alodining coatings. 

Anodizing coating uses anodes to oxidize a metal, usually aluminum, to increase its thickness for better corrosion resistance. 

Steel is not typically anodized because it can actually speed up the corrosion of the metal.

Alodine coating, also known as the chromate conversion coating, is used to prime steel and aluminum for paint, as well as prevent corrosion. 

Alodine coating

   Alodine coating

This is a cheaper process than anodizing, and can be recognized by its characteristic greenish-yellow hue. 

There can also be anti-graffiti and anti-poster coatings to protect your enclosure from vandalism.

NEMA 3R enclosures most often use powder coating. 

We can provide any coating in any color and finish, so contact us today!

What are some ways to put symbols on a NEMA Type 3R enclosure?

Our customizing services include engraving and silk-screening.

Silk Screening is the easiest and most affordable method of customization. 

Any flat side of the enclosure can be silk-screened with labels, warnings, serial number, your company name and logo. 

However, silk-screening on metal like stainless steel or aluminum can be worn off or scratched off, but a clear powder coat prevents that. 

Silk screening

 Silk screening

Engraving is more expensive and takes more time, but it is also more long-term than silk-screening. 

Usually, about 0.005 inches or 0.010 inches of metal is removed from the surface to trace the design. 

Once the metal has been removed, it is filled in with epoxy paint of any color to match your requirements. 

Engraving

Engraving

What else should I be aware of when ordering an enclosure?

There are some common mistakes that people make. 

These include choosing the wrong NEMA type, wrong material, wrong size, wrong design, and disregarding features.

NEMA types have certain environments they are suited for.

NEMA 3R is built for non-hazardous, indoor and outdoor locations with normal air pressure, rain or dripping water, some dust, snow, sleet, and ice. 

NEMA 3R usually use stainless steel 304 or galvanized steel to increase resistance to corrosion.

The size and the design of the enclosure depend on the specific electrical equipment you plan to house there. 

However, NEMA 3R enclosures are usually medium-sized or big.

As for the design and features, these are case-specific, so consult your manufacturer for advice.