Arlington EB1212-1 Electronic Equipment Enclosure Box, 12" x 12" x 4", Non-Metallic, 1-Pack
4.5Editor score
Heavy-duty UV-rated construction
Padlock-compatible latch
Top and bottom knockouts
10 Best Nema 4X Non Metallic Enclosure (October 2026) Expert Guide
A NEMA 4X non-metallic enclosure protects electrical and electronic equipment from rain, dust, debris, corrosion, and outdoor exposure. The right box must also fit the equipment, provide secure mounting, accept necessary cable entries, and offer a lockable closure that remains accessible for maintenance.
This guide compares ten enclosures using the supplied specifications, ratings, dimensions, materials, mounting provisions, locking systems, and stated protection levels. Because several listings are marketed for NEMA 4X use even though they are steel or only NEMA 4 rated, material and certification details receive careful attention throughout the comparison.
The picks show which options are genuinely non-metallic, which provide the strongest outdoor protection, and which offer practical sizes for compact or larger installations. Ratings and product availability can change, so readers should verify current listings, dimensions, certifications, and current prices before ordering.
Top 3 Picks for Best Nema 4X Non Metallic Enclosure
14x12x6 Fiberglass Weatherproof NEMA 4X Enclosure
4.2Editor score
NEMA 4X and IP66 protection
Fiberglass reinforced polyester shell
Equipment mounting plate support
Thomas & Betts Junction Box, 8 x 8 x 4 in, Gray
5.0Editor score
NEMA 6P protection rating
Direct-burial application
UL Listed Noryl housing
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Top 10 Best Nema 4X Non Metallic Enclosure in 2026 Compared
The comparison below highlights each enclosure's actual material, stated protection level, physical size, mounting provisions, and security features, making it easier to separate purpose-built non-metallic choices from metal alternatives included for context.
ProductsSpecificationsEditor scorePrice
Best Budget
Arlington EB1212-1
UV-rated non-metallic construction
NEMA 4X application
12 x 12 x 4 inches
Padlock-ready latch
4.5Editor score
Editor's Choice
14x12x6 Fiberglass Enclosure
Fiberglass reinforced polyester
NEMA 4X and IP66
15.7 x 13.8 x 6.5 inches
Brass threaded inserts
4.2Editor score
Best Premium
VEVOR 8 x 8 x 6
Cold-rolled steel construction
NEMA 4X and IP66
8 x 8 x 6 inches
Detachable mounting plate
4.5Editor score
Outdoor Box 10 x 8 x 6
Welded cold-rolled steel
NEMA 4X and IP66
10 x 8 x 6 inches
Keyed cam-lock closure
4.5Editor score
Outdoor Box 12 x 10 x 6
Welded cold-rolled steel
NEMA 4X and IP66
12 x 10 x 6 inches
Removable galvanized plate
4.5Editor score
304 Stainless Steel Box
Type 304 stainless steel
IP65 and NEMA 4
10 x 8 x 6 inches
Mounting plate included
4.6Editor score
WIEGMANN 8 x 6 x 4
Galvanized steel construction
NEMA 1 rating
8 x 6 x 4 inches
Solid screw-on cover
Outdoor Box 24 x 24 x 8
Welded cold-rolled steel
NEMA 4X and IP66
24 x 24 x 8 inches
Two keys included
4.5Editor score
Thomas & Betts 8 x 8 x 4
Noryl non-metallic housing
NEMA 6P protection
8 x 8 x 4 inches
Direct-burial capable
5.0Editor score
Outdoor Box 20 x 20 x 8
Welded cold-rolled steel
NEMA 4X and IP66
20 x 20 x 8 inches
Removable galvanized plate
4.5Editor score
1. Arlington EB1212-1 – Best Overall Nema 4X Non Metallic Enclosure
Arlington EB1212-1
UV-rated non-metallic body
12 x 12 x 4 inches
Padlock-compatible latch
Multiple top bottom knockouts
The Arlington EB1212-1 is a 12 by 12 by 4-inch non-metallic equipment enclosure with a 4.5 rating. Its most important qualification is that it genuinely matches the material and outdoor-protection priorities behind the keyword: heavy-duty, UV-rated non-metallic construction is used to protect power backups and security devices from debris and environmental exposure.
Pros
- Genuinely non-metallic construction
- Useful installation knockouts
- Secure padlock-compatible closure
- Compact four-inch depth
- Suited to power and security devices
Cons
- Smaller than large equipment boxes
- No removable mounting plate stated
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Installation details make this compact box practical for installers who do not want to modify every entry. It includes 1/2-inch and 3/4-inch knockouts on the top and bottom, giving installers options for routing wiring or conduit. The latch accommodates a padlock, while the front door includes a knockout sized for an optional EBL1-1 cam lock, allowing users to choose an additional keyed security layer.
The main limitation is its relatively shallow, compact format. Equipment with substantial depth, large cooling fins, cable bend-radius needs, or multiple large panels may require a deeper enclosure. A mounting plate is not mentioned in the supplied specifications, so installers should confirm how the equipment will be supported and whether an accessory plate is available. These are manageable constraints for small power and security installations.
This is the strongest all-purpose choice for readers who specifically want a non-metallic NEMA 4X-style enclosure without paying for a large fiberglass or direct-burial housing. It combines UV resistance, useful knockouts, and two possible locking methods in a familiar 12-inch-square format. For appropriately sized equipment, it is the most directly aligned selection in the group.
Useful Factory-Punched Cable Entry
The top and bottom 1/2-inch and 3/4-inch knockouts reduce the need for field modification, particularly valuable when installation time is limited. Confirm the knockout layout against the required conduit size and the number of cables entering the enclosure.
Flexible Two-Stage Security
A padlock-compatible latch provides immediate physical security, while the front-door knockout allows an optional EBL1-1 cam lock. This makes the enclosure adaptable to installations where access control is important but equipment-specific keying is not required.
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2. 14x12x6 Fiberglass Enclosure – Best Feature-Rich Nema 4X Non Metallic Enclosure
14x12x6 Fiberglass Enclosure
Fiberglass reinforced polyester body
NEMA 4X IP66 protection
15.7 x 13.8 x 6.5 inches
Threaded brass insert bosses
The 14x12x6 Fiberglass Weatherproof NEMA 4X Enclosure has a 4.2 rating and is one of the most technically complete choices in this guide. Its fiberglass reinforced polyester construction is non-conductive, corrosion resistant, and designed not to interfere with wireless signals, making it especially useful for access points, RFID readers, IoT sensors, cameras, and remote terminal units.
Pros
- Detailed environmental protection claims
- Corrosion and chemical resistance
- Radio-transparent fiberglass construction
- Equipment mounting plate support
- Stainless hardware and feet
Cons
- Larger than its nominal dimensions
- No published customer rating
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Protection is the defining feature. The listing states NEMA Type 4 and 4X, IP66, and broader suitability for NEMA 1, 2, 4, 12, and 13 specifications. A fully gasketed lid supports the weatherproof design, while a UL94-5V flame rating and CE certification add useful material and compliance information. Raised bosses with threaded brass inserts can accept an equipment mounting plate.
Dimensions deserve attention. The nominal 14 by 12 by 6-inch description corresponds to outer dimensions of 15.7 by 13.8 by 6.5 inches, with inside dimensions of 12.7 by 10.7 by 5.5 inches. That usable interior is more relevant to equipment clearance than the marketing size. A slightly lower rating than several competing listings may reflect buyer feedback rather than a lack of construction features, but ratings should still be considered alongside objective specifications.
This enclosure is best for users who need more than a basic weather box: a radio-transparent housing, corrosion resistance, secure stainless hardware, wall-mounting feet, and a plate-mounting provision. Those attributes make it particularly attractive for communications and technology equipment, provided the installer accurately measures the interior and verifies local code requirements.
Radio-Friendly Outdoor Housing
Fiberglass does not block wireless signals, so the enclosure can protect WiFi access points, RFID readers, sensors, and cameras without introducing the shielding associated with metal boxes. That benefit can simplify deployments where communication coverage matters more than structural rigidity.
Corrosion-Resistant Hardware Package
A continuous stainless steel hinge, stainless latches, four stainless wall-mounting feet, and included stainless screws support long-term outdoor durability. Padlock provisions add another layer of resistance to unauthorized access.
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3. VEVOR 8 x 8 x 6 – Best Compact Steel Nema 4X Enclosure
VEVOR 8 x 8 x 6
1.5 mm cold-rolled steel
NEMA 4X IP66 protection
8 x 8 x 6 inches
Detachable galvanized backplate
The VEVOR 8 by 8 by 6-inch enclosure has a 4.5 rating and a clear NEMA 4X and IP66 proposition. It is built from 1.5 mm cold-rolled steel that is precision cut and welded, creating a rigid body intended to protect electrical components in demanding indoor or outdoor locations.
Pros
- Rigid one-piece steel body
- Compact eight-inch-square format
- Removable component mounting plate
- Reinforced hinged cover
- Predrilled grounding provisions
Cons
- Steel conflicts with non-metallic requirement
- Potential radio-signal shielding
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The removable galvanized mounting plate is a major practical advantage for electrical installations. Installers can secure breakers, contactors, timers, or similar components before placing the plate inside the enclosure. Four rear wall-mounting holes simplify attachment, while the reinforced hinged cover and lock core improve security and durability. Preinstalled grounding screws and smooth cable cutouts help reduce installation damage.
This is not a non-metallic enclosure, and that distinction should be explicit. Steel can provide excellent impact resistance and physical security, but it is conductive, may corrode under harsh conditions, and can interfere with radio-frequency signals. Buyers searching specifically for a non-conductive NEMA 4X box should regard this as a relevant metal alternative rather than a literal keyword match.
The VEVOR is still a good choice for a compact electrical junction application where a rigid steel body and detachable plate are the priorities. Its 4.5 rating and straightforward installation layout make it a practical alternative, but it is not the recommendation for installations specifically requiring fiberglass, Noryl, or another non-metallic housing.
Plate-First Electrical Installation
The detachable backplate allows components to be assembled away from the enclosure walls, which can improve working clearance and reduce the risk of accidental contact with the enclosure. It also makes future inspection or component replacement more straightforward.
Strength for Compact Junctions
The welded steel body offers rigidity in a compact 8-inch-square format. That makes it suitable where space is limited but the enclosure still needs to withstand physical handling and contain electrical components securely.
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4. Outdoor Box 10 x 8 x 6 – Best Mid-Size Steel Nema 4X Enclosure
Outdoor Box 10 x 8 x 6
1.5 mm welded steel shell
NEMA 4X IP66 protection
10 x 8 x 6 inches
One-piece molded gasket
The 10 by 8 by 6-inch Outdoor Electrical Box pairs a 4.5 rating with stated NEMA 4X and IP66 protection. It is made from 1.5 mm welded cold-rolled steel, finished with polished and powder-coated surfaces intended to resist rust and corrosion. The result is a rigid, square enclosure designed for outdoor electrical equipment.
Pros
- Useful mid-size enclosure
- Precision lip and molded gasket
- Two keys included
- Galvanized removable mounting plate
- Preinstalled grounding screws
Cons
- Not made from non-metallic material
- Bottom plate needs installation before outdoor use
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The one-piece molded gasket and precision door lip are central to its weather-protection claims. A reinforced hinge helps keep the door aligned and maintain even gasket compression. The keyed metal cam lock comes with two keys, while the removable galvanized plate supports breakers, contactors, and timers. Four predrilled rear holes provide wall-mounting points, and a bottom plate accepts conduit or cable glands.
The box is steel rather than non-metallic, so it does not fulfill the strictest reading of the keyword. It also requires careful preparation: the supplied information explicitly says to install the bottom sealing plate before outdoor use or rain can enter through the cable opening. That installation step is essential and should not be treated as optional.
For buyers seeking a manageable enclosure for pumps, generators, irrigation controllers, pool timers, or smaller outdoor electrical assemblies, the 10-inch-wide design offers useful working space without becoming unwieldy. It is a strong steel alternative for the roundup, but users who need a non-conductive housing should move to the Arlington, fiberglass, or Thomas & Betts options.
Consistent Gasket Compression
The one-piece gasket, accurate door lip, and reinforced hinge work together to keep the door aligned. This design focus is important because weather resistance depends on the seal being compressed evenly around the entire opening.
Pre-Installation Reminder
Install the bottom sealing plate before the enclosure is placed in service outdoors. The listed opening is intended for conduit and cable glands, so leaving that entry open could allow rain to reach the interior.
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5. Outdoor Box 12 x 10 x 6 – Best Flexible Steel Nema 4X Enclosure
Outdoor Box 12 x 10 x 6
1.5 mm welded steel shell
NEMA 4X IP66 protection
12 x 10 x 6 inches
Removable galvanized backplate
The 12 by 10 by 6-inch Outdoor Electrical Box offers a little more width and height than the preceding 10 by 8 by 6-inch model while maintaining the same stated 1.5 mm steel construction. It carries a 4.5 rating and is specified for NEMA 4X and IP66 protection in indoor or outdoor installations.
Pros
- Balanced interior and footprint
- Powder-coated steel construction
- Reinforced hinged door
- Two-key cam-lock system
- Removable component plate
Cons
- Conductive metal rather than non-metallic
- Sealing plate required outdoors
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Its molded gasket and precision door lip support consistent weather sealing, while a reinforced hinge keeps the cover aligned. The galvanized mounting plate lifts out for component installation and then returns to the enclosure. This arrangement is useful for contactors, timers, small breaker panels, and similar equipment. Two keys accompany the keyed cam lock, and wall-mounting holes are predrilled into the back.
As with the other steel products in the guide, non-metallic compatibility is the main caveat. Steel may be preferable for physical impact resistance, but it is not non-conductive and can shield radio frequencies. The enclosure's stated suitability for pumps, generators, irrigation equipment, pool timers, and outdoor outlets remains useful for readers who prioritize metal strength.
The 12 by 10 by 6 format is a versatile middle ground for equipment that needs a little more installation room than a compact junction box. Users should install the bottom sealing plate before outdoor operation and use appropriate conduit fittings or cable glands. For strictly non-metallic projects, this should be viewed as a strong alternative rather than the primary match.
Room for More Equipment
The larger face gives installers more room to arrange a removable plate, cable routing, and small electrical components. It can be a better starting point than an 8-inch box when wiring paths are expected to be complex.
Serviceable Plate and Lock
The lift-out plate simplifies preassembly, while the keyed cam lock provides straightforward access for owners or technicians. Including two keys reduces the inconvenience of a single lost key during initial setup.
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6. 304 Stainless Steel Box – Best Stainless Outdoor Equipment Enclosure
304 Stainless Steel Box
Type 304 stainless steel
IP65 NEMA 4 protection
10 x 8 x 6 inches
Included mounting plate
The 10 by 8 by 6-inch IP65 Weatherproof Stainless Steel Box has a 4.6 rating, the highest published numerical rating among the listed products. It is made from 304 stainless steel and is intended to protect electrical and electronic controls, instruments, and components in indoor or outdoor applications.
Pros
- Highest published rating
- Type 304 stainless construction
- Complete installation accessories
- Bonding studs for grounding
- Turn-latch hinged cover
Cons
- Not NEMA 4X certified
- Metal may interfere with radio signals
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The included accessories make it notably installation-ready. Buyers receive a mounting plate, wall brackets for surface mounting, bonding studs on the base and cover, a bottom wiring opening, and NPT 1/2-inch and 3/4-inch waterproof cable connectors with corresponding covers. A hinged cover with a turn latch provides routine access and can be secured with a padlock.
Protection is the important limitation. The stated rating is IP65 and NEMA 4, not NEMA 4X. That distinction matters in environments with corrosion exposure, powerful directed water, or conditions where Type 4X's corrosion-resistance provisions are required. It is also a metallic enclosure, so it does not meet the non-metallic requirement and may attenuate wireless signals.
This box is attractive when Type 304 stainless steel, included cable connectors, and a well-equipped installation package are the priorities. It may suit controls, instruments, and general electronic equipment in protected outdoor locations. Buyers whose specification explicitly says NEMA 4X or non-metallic should not substitute this option without professional approval.
Comprehensive Included Hardware
Mounting plate, wall brackets, bonding studs, cable connectors, and covers reduce the need to source separate accessories. The bundle is especially useful for installers who want a standard enclosure ready for surface mounting and wired connections.
Understand the NEMA Difference
NEMA 4 and NEMA 4X are not interchangeable labels. This product is listed for IP65 and NEMA 4, so it should not be represented as a Type 4X enclosure. Verify whether the installation environment requires the additional corrosion characteristics associated with Type 4X.
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7. WIEGMANN 8 x 6 x 4 – Best Basic Screw-Cover Junction Enclosure
WIEGMANN 8 x 6 x 4
Galvanized steel construction
NEMA 1 enclosure rating
8 x 6 x 4 inches
Solid screw-on cover
The WIEGMANN 8-inch-high by 6-inch-wide by 4-inch-deep metallic enclosure is suited to junction or pull-box use in commercial and industrial environments. It uses galvanized steel, has a solid screw-on cover, and is listed under the SC-G series. No customer rating is supplied for this listing.
Pros
- Simple removable cover
- Compact galvanized steel body
- Embossed mounting holes
- Suitable for basic pull boxes
Cons
- Not outdoor-rated NEMA 4X
- Not a non-metallic enclosure
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The cover design allows it to be removed without extracting the cover screws from the enclosure body. That arrangement can make installation and service less frustrating than a fully fastened box. Embossed mounting holes provide basic attachment support, and self-tapping screws are included. The enclosure is also UL Listed and CSA Certified according to the supplied specifications.
This product is far removed from the NEMA 4X non-metallic target. It has a NEMA 1 rating, no weatherproofing claims, a metallic body, and a screw closure rather than a gasketed outdoor enclosure. It should therefore be considered for an indoor general-purpose junction application, not for rain, dust ingress, or corrosion-prone outdoor equipment.
Even with those limitations, the enclosure is a clean, straightforward solution for an indoor pull box where simple access and a removable cover are more important than outdoor sealing. It ranks in this guide to provide a useful contrast: a box can serve an electrical purpose without satisfying the weatherproof characteristics central to the keyword.
Convenient Removable Cover
The cover can be removed while leaving its screws in the body, which preserves alignment and reduces repeated handling of loose fasteners. That feature is helpful during initial wiring and later service.
Indoor General-Purpose Use
A NEMA 1 galvanized enclosure is appropriate for many dry indoor junction and pull-box tasks. It should not be selected for exposed outdoor service, washdown areas, or installations requiring Type 4X corrosion resistance.
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8. Outdoor Box 24 x 24 x 8 – Best Large Steel Nema 4X Enclosure
Outdoor Box 24 x 24 x 8
1.5 mm welded steel shell
NEMA 4X IP66 protection
24 x 24 x 8 inches
Keyed cam-lock with keys
The 24 by 24 by 8-inch Outdoor Electrical Box is the largest NEMA 4X enclosure in this group, offering a substantial 4.5 rating and a generous area for equipment. Its welded 1.5 mm cold-rolled steel body is polished and powder coated to resist rust and corrosion, while the stated NEMA 4X and IP66 ratings position it for demanding outdoor or indoor use.
Pros
- Generous equipment capacity
- Deep eight-inch enclosure
- Removable galvanized plate
- Reinforced hinged cover
- Weather-sealing gasket system
Cons
- Large physical footprint
- Steel is not non-metallic
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The removable galvanized mounting plate provides a stable base for pumps, generators, irrigation controllers, pool timers, outdoor outlets, and small breaker panels. Its size creates room for more components and wiring than the smaller steel boxes. A one-piece molded gasket, precision door lip, and reinforced hinge support even closure, and the keyed metal cam lock includes two keys.
As with the other products in this steel series, the bottom sealing plate must be installed before outdoor use. This is particularly important in a large enclosure because the bottom entry is designed to accommodate conduit and cable glands. The box is conductive, so it is not appropriate when non-metallic or radio-transparent construction is required.
The 24-inch model is a logical choice for a larger pump controller, generator-related equipment, or a multi-component outdoor installation. Its capacity reduces the need to combine several small boxes, although the broad footprint may require more wall space and careful planning around conduit routing.
Capacity for Larger Assemblies
A 24 by 24-inch mounting area can accommodate several related components while leaving room for cable routing. This makes the enclosure more useful when the installation includes a controller, disconnect, timer, surge protection, or other supporting devices.
Plan for Wall Space
The larger enclosure offers more installation flexibility but requires a suitable wall or support structure. Verify fixing locations, service access, conduit paths, and clearance around the door before installation rather than discovering space conflicts after wiring begins.
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9. Thomas & Betts 8 x 8 x 4 – Best Direct-Burial Nema 4X Non Metallic Enclosure
Thomas & Betts 8 x 8 x 4
Noryl non-metallic housing
NEMA 6P protection
8 x 8 x 4 inches
UL Listed direct-burial design
The Thomas & Betts 8 by 8 by 4-inch Junction Box has a 5.0 rating and represents a specialized option for demanding installations. Its gray Noryl housing is non-metallic, corrosion resistant, and designed for direct-burial electrical applications. The supplied specifications identify it as the first non-metallic junction box UL Listed with a NEMA 6P rating.
Pros
- Perfect published customer rating
- NEMA 6P exceeds Type 4X
- Direct-burial application support
- Corrosion-resistant Noryl body
- UL Listed and code-conscious
Cons
- Compact 8-inch-square size
- No stated mounting-plate provision
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NEMA 6P provides a higher stated protection class than the Type 4X requirement that gives the keyword its focus. That makes this box relevant to wet locations, washdown exposure, and other environments where sealing and corrosion resistance are critical. Its UL Listing and stated compliance with National Electrical Code section 314 exception are also meaningful for code-conscious installations.
The physical format remains compact. At 8 by 8 by 4 inches, it may not provide enough depth for large controls or generous service clearances, and the supplied information does not mention a mounting plate. Buyers should therefore treat it as a junction box for compatible equipment rather than assuming it can replace a general equipment enclosure of the same dimensions.
This is the top specialized pick for a direct-burial, non-metallic installation where the highest published customer rating and NEMA 6P construction are decisive. It is less versatile than the fiberglass model for wireless equipment, but its certification and burial capability make it a standout when the application specifically requires a listed, corrosion-resistant underground junction solution.
Protection Above Type 4X
The stated NEMA 6P rating goes beyond the Type 4X baseline. It is especially relevant when an installation faces temporary flooding, powerful water jets, or severe conditions where a high level of ingress protection is required.
Designed for Direct Burial
The listing specifically identifies direct burial as an intended application, a capability not established by the other non-metallic choices. This makes the box relevant to underground electrical systems, subject to local installation requirements and the supplied listing information.
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10. Outdoor Box 20 x 20 x 8 – Best Large Square Steel Nema 4X Enclosure
Outdoor Box 20 x 20 x 8
1.5 mm welded steel shell
NEMA 4X IP66 protection
20 x 20 x 8 inches
Removable galvanized backplate
The 20 by 20 by 8-inch Outdoor Electrical Box combines a 4.5 rating with NEMA 4X and IP66 protection in a large square format. It uses the same welded 1.5 mm cold-rolled steel approach as the smaller products in the series, with polished and powder-coated surfaces intended to resist rust and corrosion.
Pros
- Large square mounting area
- Deep enclosure for wiring
- Weather-resistant powder coating
- Reinforced hinge and cam lock
- Two keys included
Cons
- Not a non-metallic housing
- Bottom entry requires sealing
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The generous 20-inch face gives installers more room for a removable galvanized mounting plate, multiple components, and wiring management. It is listed for pumps, generators, irrigation controllers, pool timers, outdoor outlets, and small breaker panels. A one-piece gasket, precise door lip, reinforced hinge, and keyed cam lock support weather protection and secure access, with two keys included.
The material mismatch remains important. This is a metal box, not a non-metallic one, and its conductive construction may be unsuitable around sensitive radio equipment. The bottom plate also needs installation before outdoor use so the intended conduit opening does not become an unprotected route for rain.
The 20-inch model is a useful option for users who need substantial capacity but do not require the very large footprint of the 24-inch enclosure. It can consolidate a moderate amount of outdoor electrical equipment into one serviceable housing, provided the installation location, structural support, conduit arrangement, and sealing plan are properly designed.
Balanced Large-Enclosure Size
At 20 inches square, this model offers more usable face area than the 12 by 10 and 10 by 8-inch options while remaining smaller than the 24-inch version. That middle position can be helpful when equipment volume and wall space must both be considered.
Consistent Outdoor Entry Details
The one-piece gasket, precision lip, and reinforced hinge are designed to preserve even compression around the door. Installing the bottom sealing plate and suitable cable glands completes the listed outdoor protection arrangement.
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Buying Guide – How to Choose the Best Nema 4X Non Metallic Enclosure
The right enclosure depends on material, protection level, equipment dimensions, mounting requirements, environmental exposure, and access needs. Comparing those factors before purchasing helps prevent an enclosure that is too small, insufficiently sealed, or unsuitable for the installation environment.
Confirm the Housing Material
A non-metallic enclosure may be made from fiberglass reinforced polyester, Noryl, or another validated polymer. These materials offer useful corrosion resistance and are non-conductive, which can be advantageous around outdoor electronics and radio equipment. They also differ from galvanized steel, cold-rolled steel, and stainless steel, so a listing that merely says weatherproof is not enough. Check the material in the product specifications and do not assume a box with a NEMA 4X label is non-metallic.
Verify the Protection Rating
NEMA 4X is more demanding than a basic NEMA 3R or NEMA 4 enclosure because Type 4X addresses corrosion resistance in addition to ingress protection. Products in this guide range from NEMA 1 to NEMA 6P, so a careful comparison reveals major differences. IP66 is commonly listed alongside NEMA 4X, but the two rating systems should not be treated as identical labels in every standard. For demanding wet or corrosive locations, select a product whose stated rating satisfies the project specification.
Measure Usable Interior Space
Nominal enclosure dimensions do not always describe the space available to the installer. Fiberglass products may include thick walls, raised bosses, hinges, and internal clearance, while steel boxes can also lose usable space to the mounting plate and door hardware. Measure the equipment, account for wire bend radius, connectors, ventilation requirements if applicable, and service access around terminals. Also check the depth needed for cable entry rather than focusing only on the width and height.
Select the Right Mounting System
Some enclosures include a detachable or removable plate, while others use embossed holes or raised bosses designed to accept a plate. A stable plate is valuable for electrical components, but the absence of a stated plate does not automatically disqualify a box for lightweight equipment. Consider the weight of the installed components, vibration potential, wall structure, and whether the enclosure will be surface-mounted or embedded. Confirm that mounting hardware is suitable for the wall and the enclosure material.
Evaluate Locking and Access
A latch, cam lock, or screw cover serves both security and service functions. The Arlington model accepts a padlock and can accept an optional cam lock, while several steel boxes include keyed cam locks and keys. The Thomas & Betts option provides a UL Listed housing and locking arrangement, while the WIEGMANN product uses screws and a removable cover. Choose based on the need for keyed access, padlock provisions, tamper resistance, and how often technicians must open the enclosure.
Plan Cable Entries and Sealing
A weather-resistant enclosure still needs correctly prepared entries. The Arlington box offers top and bottom knockouts in 1/2-inch and 3/4-inch sizes, while several steel boxes include bottom plates designed for conduit or cable glands. The stainless option includes NPT 1/2-inch and 3/4-inch waterproof connectors and covers. Confirm entry locations, the number and size of cables, conduit fittings, gland compatibility, and whether a bottom sealing plate must be installed before the enclosure enters outdoor service.
Consider Equipment and Environment
The application should guide the final material and feature choices. Fiberglass is non-conductive and radio transparent, making it useful for access points, sensors, cameras, and other communications equipment. Noryl and the Thomas & Betts direct-burial design suit demanding junction applications. Steel may be better where impact resistance and physical security are priorities, but it can corrode or shield signals. Temperature, sunlight, chemicals, wind, flooding, and washing frequency should also be checked against the enclosure's documented ratings.
Review Certification and Installation Details
UL, CSA, CE, and NEMA claims provide useful evidence, but they apply only to the specific product and stated conditions. The Thomas & Betts box is UL Listed and the WIEGMANN enclosure is UL Listed and CSA Certified, while the fiberglass model lists CE certification and a UL94-5V flame rating. Review the listing, manufacturer documentation, and local code requirements. The Thomas & Betts product also references National Electrical Code section 314 exception, making professional code verification especially important.
How to Use and Care for Your Nema 4X Non Metallic Enclosure
Before installation, verify the enclosure's exterior and interior dimensions, compare them with the equipment, and confirm that the stated protection rating is suitable for the site. Mark mounting positions, conduit paths, and cable entries before removing knockouts or drilling. A non-metallic housing may drill differently from metal, so use appropriate tooling and avoid creating cracks near mounting bosses or sealed joints.
Mount the enclosure securely, install the equipment or removable plate, and connect grounding or bonding points as required by the applicable electrical code. Use the supplied or specified sealing plates, gaskets, cable glands, and conduit fittings. Do not leave a bottom opening exposed in an outdoor installation. Fasten covers evenly so the gasket remains compressed consistently, then confirm that the door closes without binding or forcing.
During maintenance, isolate electrical power as required and inspect the gasket, latch, hinges, seals, cable entries, and interior for moisture or contamination. Clean with a mild, non-abrasive method and dry the enclosure completely before reinstalling equipment. Replace damaged gaskets or seals rather than relying on a loose door to restore protection, and keep the included keys or padlock combinations accessible to authorized personnel.
Frequently Asked Questions
What is a NEMA 4X non-metallic enclosure?
It is an outdoor-rated electrical housing made from a non-conductive material such as fiberglass reinforced polyester or Noryl. NEMA Type 4X is intended to provide protection against specified external influences and corrosive conditions in addition to the ingress characteristics associated with weather-resistant enclosures. The exact suitability depends on the product's stated certification, construction, and installation conditions.
Is a fiberglass enclosure better than a Noryl junction box?
It depends on the application. Fiberglass is often convenient for larger equipment enclosures, wall mounting, radio-transparent installations, and mounting-plate support. Noryl is particularly notable in the Thomas & Betts option for its compact direct-burial capability and NEMA 6P rating. The correct choice depends on size, burial conditions, equipment, code requirements, and the protection level specified for the project.
Does NEMA 4X always mean IP66?
Not necessarily. Many NEMA 4X products are also advertised as IP66, but NEMA and IP are different classification systems with different test considerations. Buyers should review the actual enclosure listing and installation requirements rather than assuming that one rating automatically substitutes for the other. A product explicitly labeled only NEMA 4 or IP65 should not be treated as a Type 4X enclosure without appropriate verification.
Can a metal NEMA 4X enclosure be used for wireless equipment?
It can physically protect wireless equipment, but the metal shell may attenuate radio signals or prevent effective wireless communication. A radio-transparent fiberglass or other non-metallic enclosure is generally more appropriate for access points, RFID readers, and other communications devices. The antenna placement and enclosure materials should be reviewed as part of the equipment design.
How do I choose the correct enclosure size?
Measure the equipment's width, height, and depth, then add space for wiring, connectors, heat dissipation, and service access. Also review the stated usable interior dimensions, since the nominal exterior size may overstate the available mounting area. When components are heavy or subject to vibration, verify the enclosure's mounting plate and attachment method as well.
What must be installed before using these boxes outdoors?
Every entry intended for cables or conduit must be properly fitted and sealed. The listed 10 by 8, 12 by 10, 20 by 20, and 24 by 24-inch outdoor steel boxes specifically require installation of the included bottom sealing plate before outdoor use. The stainless model includes waterproof cable connectors and covers, while the Arlington enclosure provides knockouts that must be fitted with suitable protected entries.
Is a NEMA 6P enclosure suitable for a NEMA 4X project?
A NEMA 6P product is generally a higher-rated option, but suitability also depends on dimensions, materials, installation method, and the governing code. The Thomas & Betts Noryl box is listed for direct burial and carries a 5.0 rating, making it compelling for a demanding non-metallic junction application. Electrical professionals should still verify the complete installation against local requirements.
How should I maintain a non-metallic outdoor enclosure?
Inspect the cover gasket, latch, hinges, mounting points, and cable seals regularly, especially after severe weather. Remove debris and moisture with a mild cleaner that will not damage the housing, then let the enclosure dry fully before replacing equipment. Cracks, distorted doors, hardened gaskets, or missing seals should be addressed promptly because they can undermine the original protection level.
Final Thoughts on Choosing the Best Nema 4X Non Metallic Enclosure
The Arlington EB1212-1 is the most directly aligned compact recommendation, combining genuinely non-metallic, UV-rated construction with useful knockouts and flexible locking. The 14x12x6 fiberglass enclosure is the feature-rich editor's choice for radio-transparent equipment and corrosion-resistant outdoor protection, while the Thomas & Betts Noryl box stands apart with a 5.0 rating, NEMA 6P protection, and direct-burial capability.
Prioritize actual material before comparing secondary features. If the project specifically requires a non-metallic housing, narrow the field to the Arlington, fiberglass, and Thomas & Betts products, then match the enclosure's dimensions, protection level, mounting design, and environmental suitability to the installation. A larger steel box may be mechanically rugged, but it does not satisfy a strict non-conductive requirement.
Finally, verify current ratings, dimensions, included accessories, and current prices on the retailer listing before purchasing. Product configurations and seller information can change, and local electrical codes may impose additional requirements that are not visible in a general product guide.