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Benefits of the NEMA 4X Junction Box

NEMA 4x junction box

With advancements in technology, we are starting to install electrical components in numerous non-traditional settings. Accordingly, most industries have discovered the importance of using weatherproof enclosures since operating conditions have gradually changed in virtually all industries. West Tool Enclosures provides the best weatherproof junction boxes on the market.  With a vast catalog of sizes and configurations to choose from.  Get Started here!

Along with various operational changes, varying environmental conditions have also impelled firms to make use of different types of enclosures and junction boxes.

To ensure these components are adequately protected, selecting the right junction box for the application in the name is essential. One of the most popular provisions for outdoor use is the NEMA 4 junction box. So, what exactly are these devices, and what benefits do they offer?

Variants of NEMA Type 4 Junction Boxes

NEMA 4 junction boxes afford more excellent protection against various harsh weather conditions. They boast watertight features that make an ideal fit for various industrial applications like safeguarding power systems, outdoor wiring systems, as well as mounted telecommunication gadgets.

These types of enclosures also offer corrosion resistance, therefore stainless steel is increasingly used in cabinets and enclosures in multiple industrial applications. In fact, this is what most industrial clients prefer due to its rugged and corrosion-resistant characteristics. Plastic materials or FRP (fiberglass) might also find use mainly in small junction boxes, however stainless steel is by far the most popular and efficient material for these enclosures.

There are two variants of the NEMA type 4 junction boxes mainly:

  1. NEMA Type 4 Junction Boxes
  2. NEMA Type 4X Junction Boxes
NEMA Type 4 Junction Boxes

These types of enclosures are mostly suited for outdoor usage, mainly where extra protection against wind-driven rain and moisture is necessary.

  • Outdoor or indoor use to safeguard personnel against accessing hazardous parts
  • Safeguards the equipment in the enclosure against the entry of solid foreign objects (dirt)
  • Protects against damage of the equipment due to water ingress (rain, hose-directed, or splashing water)
  • Undamaged by ice formation (external) on the enclosure
NEMA Type 4X Junction Boxes

The NEMA 4X junction box enclosure is mainly designed for outdoor usage, and it affords superior protection from extreme settings and corrosion. These junction boxes are primarily designed to offer protection to the housed components in case they are hosed, or in distinct applications where corrosion is a significant concern. Some of the equipment may include electrical, wiring, terminal, and so much more. Several ideal applications of NEMA 4X junction box enclosures are in solar, pump control, marine, waste facilities, etc.

  • Outdoor or indoor use to safeguard personnel against accessing hazardous parts
  • Safeguards the equipment in the enclosure against the entry of solid foreign objects (dirt)
  • Protects against damage of the equipment due to water ingress (rain, hose-directed, or splashing water)
  • Undamaged by ice formation (external) on the enclosure
  • Corrosion-resistant

Both NEMA 4X junction boxes and NEMA 4 enclosures are purposely designed for outdoor and indoor use. They both safeguard against hose-directed water or water intrusion, with the latter even protecting against corrosion. As such, if you need to clean a NEMA 4 enclosure using a hose, you don’t need to worry about the water damaging any electrical component inside.

NEMA 4x junction box

Benefits of Type 4 NEMA Enclosures


Like any other junction box, NEMA 4 enclosures render electrical components and wiring connections easy to access. What’s more, you can utilize their wiring to appliances in protecting and encasing electrically charged wires. NEMA 4 junction boxes conceal cables, effectively keeping them free of dust, dampness, and dirt while subsequently keeping your building looking tidy and neat.

Weather-Proof to Facilitate Safe Outdoor Applications

NEMA 4 junction boxes are ideally designed to suit outdoor applications. Therefore, they are a perfect fit for outdoor use with their watertight design. With proper installation, these junction boxes effectively seal out any external weather components, subsequently ensuring that there is no ingress of moisture/water which eventually leads to electrical shorting.

Safeguard Against Corrosion

In electrical-specific applications, such as where excess moisture content is present, corrosion is a relatively common issue. Nonetheless, since NEMA 4X junction box enclosures are usually watertight, they can effectively prevent any condensation from subsequently damaging any electrical components within the enclosure.

Prevent Electrical Shorts

Depending on where it is located, water can inevitably creep in, subsequently shorting out your connections. This is especially so if the area where the enclosure is installed receives frequent or heavy rainfall, for instance. Nonetheless, NEMA 4 enclosures offer protection to the elements against short circuits, as well as loose connections among other benefits.

Protect Against Interference

In the distinctive constant connectivity era, there has been a significant necessity for radio frequency interference (RFI) and electromagnetic interference (EMI) shielding. With virtually every signal simultaneously beaming in the atmosphere, design engineers need to guarantee that their gadgets don’t result in interference, or even get affected. Luckily, NEMA 4 enclosures (aluminum) provide a natural protection degree against interference, and they also offer multiple benefits beyond interference-shielding.

Insulation Properties

Designed as a weatherproof enclosure, NEMA 4-rated junction boxes are effectively insulated using an exclusive compound which boasts excellent insulating properties. Usually, these enclosures comprise outdoor fixture or cover purposed for wet or damp locations, which is dependent on where it is used. In essence, these junction boxes are watertight, and therefore they can effectively protect against hose-sprayed water.

NEMA 4x junction box

NEMA Ratings and Why They Are Important

Usually, when discussing the various “types” of junction boxes and enclosures, most individuals are typically outlining types of enclosures as provided for by NEMA (National Electrical Manufacturer’s Association). NEMA is an independent organization created to establish the standards dictating the manufacture of industrial electrical enclosures.

NEMA typically utilizes a conventional rating system which subsequently defines the various environmental provisions where an electrical enclosure may be used, as well as outline the capacity of a fixed enclosure to withstand various environmental settings. In essence, the NEMA standards define products according to their capabilities and attributes.

NEMA ratings are what will tell you if a junction box is suited for usage in non-hazardous or hazardous locations, not to mention their suitability for outdoor or indoor usage. Also, a NEMA rating will outline how properly an enclosure is safeguarded against coolants, oil, as well as corrosives. By using these standards, NEMA significantly benefits both the manufacturer as well as the user. They boost economics and safety, not to mention communication between the client and the manufacturer.

Final Thoughts

Choosing the right junction box and enclosure to suit your needs not only helps you cut down on costs, but it also ensures your electrical elements are adequately safeguarded. If you want to protect your outdoor or indoor electrical components sufficiently, NEMA 4 junction boxes are undoubtedly the way to go.

At West Tool Enclosures, we offer an assortment of junction boxes and electrical enclosures designed to satisfy the needs of virtually all applications. From weatherproof enclosures in stainless steel to NEMA 4X junction box rated enclosures, we have the ideal enclosure solution both for outdoor and indoor settings. What’s more, our enclosure options allow you to choose from an extensive array of available features with virtually innumerable sizing options purposely configured to meet your specific needs and applications.

Are you having an enclosure or junction box problem? Be sure to contact us and speak to our diligent team of professionals to find out about how you can get the right NEMA-rated and UL-listed enclosure for your projects at a reasonable price.