Custom NEMA 3R Enclosure Manufacturer in China

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.

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.

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.

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

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

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

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

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 

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

Wall-mounted 和 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 

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)

Of course, we also offer 定制外壳.

What additional features are often included?

您可以要求通风口、窗户、铰链门、锁、电缆管理系统等等。

通风口以及散热风扇为热量的散发提供了通道，从而冷却了机柜的电气元件。

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.

这可以延长它们的使用寿命并降低发生故障的可能性。

 Radiating fan in an enclosure

这些还可以稳定外壳内的气压，防止可能损坏外壳电气元件的冷凝。

视窗 帮助人员以快速、非侵入的方式检查电气元件。

如果出现问题，窗口可以帮助您立即查看发生的情况。

此外，红外线窗户有助于保护工人免受 电弧闪光 accidents by letting them see heat buildup.

 Enclosure with a window and a lock

铰链门 控制外壳的门或盖子的打开方式和打开程度。

这还包括您可以请求的各种句柄。

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

锁, 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.

  文件袋

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.

热交换器

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

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.

它们可以由 碳钢, 镀锌钢， 和 不锈钢 – usually of the grades 304 or 316.

碳钢通常比不锈钢更暗。

由于它仅含有铁和碳，因此还具有磁性且更易延展。

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

不锈钢是在铁碳合金中添加铬、镍和钼而制成的。

 不锈钢与镀锌钢

304 和 316 钢种在所有添加剂的含量上有所不同。

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

镀锌钢 涂有一层锌保护层，可防止腐蚀。

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.

玻璃纤维 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.

 玻璃纤维外壳

Enclosures can also be made from aluminum alloys.

与钢材等级一样，铝合金可以是 5052 或 6061 系列。

 铝与不锈钢

两者都很轻，但 5052 更易焊接，而 6061 具有更高的抗腐蚀能力。

而且6061比较贵。

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.

聚碳酸酯更耐腐蚀，而 ABS 更便宜。

如果你想了解更多， 发送您的询问 现在就进行咨询！

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

我们的外壳受到了良好的保护，但合适的涂层也可以增加其保护作用。

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

Enamel paint has a glossy finish and adds weather resistance.

粉末涂料 is deposited with the electrostatic force, and is quicker and easier than enamel.

它的外观也更加灵活，为您提供光泽和哑光饰面的选择。

粉末涂料饰面

我们还提供阳极氧化和铝氧化涂层。

阳极氧化 涂层使用阳极氧化金属（通常是铝）以增加其厚度，从而获得更好的耐腐蚀性。

钢通常不进行阳极氧化处理，因为这实际上会加速金属的腐蚀。

阿洛丁涂层，又称 铬酸盐转化膜，用于钢和铝的底漆涂装以及防止腐蚀。

   氧化铝涂层

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.

我们可以提供任何颜色和表面处理的涂层，因此 联系我们 今天！

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

我们的定制服务包括雕刻和丝网印刷。

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

外壳的任何平面都可以丝网印刷标签、警告、序列号、公司名称和徽标。

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

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.

一旦金属被去除，就会用任意颜色的环氧漆填充以满足您的要求。

雕刻

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.