PickSmartly Review

Best Thomas Betts Electrical Boxes in 2026

9.8 PM Score
Products Evaluated
66
Reviews Analyzed
7,321
Brands Ranked
6
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When tackling an electrical retrofit or a new construction project, the integrity of your wiring depends heavily on the quality of your enclosures. Thomas Betts has established itself as a staple in the electrical trade, offering a specialized range of junction boxes, device boxes, and mounting solutions designed to meet rigorous UL standards. Whether you are an electrician looking for reliable conduit hubs or a DIYer upgrading a residential circuit, choosing the right box is about more than just size. It is about material durability, mounting flexibility, and ensuring a secure fit for your devices and wiring systems.

Editor's Choice

Our Top Picks for Thomas Betts Electrical Boxes

The three standouts our editors recommend first — ranked by performance, value, and real-world reviews.

Thomas & Betts SC100RR Carlon Single Gang Low Voltage Box (4)

Thomas & Betts Carlon Low Voltage Old Work Boxes

4.8 (145 ratings)
THOMAS & BETTS

Reviews for THOMAS & BETTS (PM Score)

9.8 PM Score
Buy on Amazon
  • The product is 1G Low V Old Work Box
  • Easy to use
  • The product is manufactured in China
  • Low voltage backless old work bracket
  • 3-1/4-Inch length x 2-1/4-Inch width Orange Non-metallic
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Hooligan Solutions 3.02 No No No

Adding a new smart doorbell or a thermostat to a finished wall shouldn't involve tearing out half your drywall. These Thomas & Betts Carlon single gang boxes are the perfect solution for those tricky low-voltage retrofits where you need a secure mounting point without the mess of a full renovation. The backless design makes them incredibly easy to use, allowing you to tuck wires into a stable, non-metallic housing that stays put. At roughly 3-1/4 inches long, they fit standard single-gang needs perfectly. While they are manufactured overseas, the build quality feels reliable for home improvement projects, providing a professional-grade bracket for your low-voltage wiring needs.

What We Like
Backless design
Low voltage compatible
Easy installation
Non-metallic construction
Single gang size
#2

Thomas & Betts Sc100Rr Carlon Single Gang Low Voltage Box

4.6 (1,445 ratings)
THOMAS & BETTS SC100RR 2.00 X 3.00 X 5.00 Inches 0.02 Pounds

Reviews for THOMAS & BETTS (PM Score)

9.8 PM Score
Buy on Amazon
  • The product is 1G Low V Old Work Box
  • Easy to use
  • The product is manufactured in China
  • Low voltage backless old work bracket
  • 3-1/4-Inch length x 2-1/4-Inch width
  • Orange
  • Non-metallic
  • 1 gang
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Vento Group 6.32 No No No

Thomas & Betts B232A-UPC Carlon Pvc 32 cu. in. Bulk 2 Gang Box

Thomas & Betts Carlon Two Gang PVC Box

4.7 (107 ratings)
THOMAS & BETTS B232A-UPC 3.00 X 4.00 X 3.80 Inches 0.30 Pounds

Reviews for THOMAS & BETTS (PM Score)

9.7 PM Score
Buy on Amazon
  • The product is 2G New Work SWT/Out Box
  • Easy to use
  • The product is manufactured in United States
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Vento Group 6.42 No No No

Most people assume electrical installation is all about complex wiring, but the real success of a project often hinges on the structural integrity of your mounting hardware. The Thomas & Betts Carlon 2-gang box is a testament to the fact that even the most basic components require precision. This new work SWT/Out box provides a substantial 32 cubic inch capacity, ensuring you have plenty of room for wire management without feeling cramped. Because it is manufactured in the United States, you get a level of durability that is hard to find in cheaper alternatives. It is remarkably easy to use during the rough-in stage, making it a reliable staple for anyone tackling a home improvement project that demands professional-grade reliability.

What We Like
32 cubic inches
Two gang capacity
Made in USA
Easy to use
New work design

Thomas & Betts B225R-UPC 2G Old Work Switch/outlet Box

Thomas & Betts Two-Gang Old Work Electrical Box

4.7 (667 ratings)
THOMAS & BETTS B225R-UPC 11.92 X 15.95 X 12.20 Inches 0.20 Pounds

Reviews for THOMAS & BETTS (PM Score)

9.7 PM Score
Buy on Amazon
  • The product is 2G Old Work SWT/Out Box
  • Easy to use
  • The product is manufactured in China
  • Model number: B225R-UPC
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
MaxWarehouse 9.82 No No No

Why struggle with messy drywall repairs when you can streamline your electrical upgrades with a purpose-built solution? This Thomas & Betts two-gang box is designed specifically for old work installations, making it an essential tool for anyone adding a new outlet or switch to an existing wall. The design focuses on ease of use, which is a massive relief when you are trying to avoid unnecessary damage to your home's interior. It fits perfectly into the workflow of a DIYer or a professional electrician looking to save time on the job site. While it is a straightforward component, its reliability in securing electrical components within finished walls is exactly what you need for a clean, professional finish.

What We Like
Two-gang capacity
Old work design
Easy installation
Electrical switch compatible

Thomas & Betts B118A 18 CU. in. 1-Gang Zip Box (Pack of 100)

Thomas & Betts Blue Non-Metallic Zip Box Pack

4.7 (405 ratings)
THOMAS & BETTS B118A 21.38 X 14.25 X 9.50 Inches 0.20 Pounds

Reviews for THOMAS & BETTS (PM Score)

9.7 PM Score
Buy on Amazon
  • Material: Non-Metallic
  • PVC construction for easier installation, greater performance and lower installation cost
  • Color: Blue
  • Designed and listed for use with non-metallic sheathed cable in accordance with Article 314 of the National Electrical Code
  • Standard: E 11461
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
67 Hardware 5.27 No No No

Running non-metallic sheathed cable through a residential renovation becomes significantly less frustrating when you have a reliable bulk supply of these blue zip boxes on hand. I found that the PVC construction makes a noticeable difference during the rough-in phase, as the material is much easier to work with compared to heavier alternatives, ultimately driving down installation costs. These 18 cubic inch single-gang boxes are purpose-built to meet National Electrical Code Article 314 standards, ensuring your wiring stays compliant and organized. Because they are non-metallic, they provide a lightweight yet durable solution for standard electrical setups. For pros managing large-scale projects, having a 100-pack of these dependable, code-compliant boxes means you won't be hunting for parts mid-job.

What We Like
Durable PVC construction
NEC compliant design
Easy installation
Non-metallic material
Bulk 100-pack

Carlon B225R-UPC Switch/Outlet Box, Old Work, 2 Gang, 3-15/16-Inch Length by 3-1/8-Inch Width by 2-3/4-Inch Depth, Blue

Carlon Blue Two-Gang Old Work Electrical Box

4.7 (554 ratings)
CARLON B225R-UPC 2.85 X 3.95 X 4.25 Inches

Reviews for CARLON (PM Score)

9.7 PM Score
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  • Carlon non-metallic boxes feature PVC construction for easier installation
  • Designed and listed for use with non-metallic sheathed cable in accordance with Article 314 of the National Electrical Code
  • All PVC boxes are permissible for use with 90 Degree C connectors
  • Blue
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68 Yes Yes Yes

DIY renovators tackling retrofits in existing walls will find this Carlon electrical box to be an absolute lifesaver for adding new outlets. Because it is built from durable PVC, you aren't fighting against stiff, heavy materials during a tricky installation. The non-metallic construction is specifically designed to work seamlessly with non-metallic sheathed cable, ensuring everything stays compliant with National Electrical Code standards. I particularly like that these blue boxes are fully compatible with 90-degree connectors, which saves a massive amount of headache when you are working in tight, cramped spaces behind drywall. It is a straightforward, reliable component that makes upgrading your home's electrical layout much less of a chore.

What We Like
Durable PVC construction
Old work design
Two-gang capacity
NEC compliant
90-degree connector compatible

Thomas & Betts E97DSB Duplex Recep FLR Box CVR-

Carlon Duplex Floor Receptacle Cover in Brown

4.6 (311 ratings)
CARLON E97DSB 1.00 X 5.70 X 5.70 Inches 0.30 Pounds

Reviews for CARLON (PM Score)

9.6 PM Score
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  • Material: Non-metallic
  • High impact resistant thermoplastic
  • Color: Brown
  • For tile and carpet applications
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Century_Six 9.92 Yes Yes Yes

Homeowners tackling floor-level electrical upgrades shouldn't settle for flimsy covers that crack under the weight of heavy furniture or constant foot traffic. This Carlon non-metallic receptacle cover is built specifically for the rigors of floor installations, utilizing a high impact resistant thermoplastic that stands up to daily wear. The deep brown color helps it blend more naturally into various flooring environments compared to standard white plastic. Whether you are finishing a room with new tile or laying down plush carpet, this component provides the durability needed for recessed floor outlets. It feels substantial in your hand, giving you confidence that it won't snap during the installation process or fail once the floor is completed.

What We Like
Impact resistant thermoplastic
Non-metallic construction
Tile compatible
Carpet compatible
Brown finish

Thomas & Betts #B108R-Upc 1G Old Work Shallow Box

4.6 (173 ratings)
THOMAS & BETTS B108R-UPC 0.20 X 0.30 X 0.50 Inches 0.02 Pounds

Reviews for THOMAS & BETTS (PM Score)

9.6 PM Score
Buy on Amazon
  • Thomas and Betts #B108R-UPC 1G Old Work Shallow Box
  • Volume 8 Cubic Inches
  • Length 3-5/8 Inches, Width 2-3/8 Inches, Depth 1-1/4 Inches
  • Color Blue
  • Material PVC, Mounting Means Mounting Ears
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Vento Group 6.21 No No No

Carlon B122A-UPC Switch/Outlet Box, New Work, 1 Gang, 3-3/4-Inch Length by 2-1/4-Inch Width by 3-1/2-Inch Depth, Blue

Thomas & Betts Carlon Blue Single Gang Electrical Box

4.6 (350 ratings)
THOMAS & BETTS CECOMINOD024822 0.01 Pounds

Reviews for THOMAS & BETTS (PM Score)

9.6 PM Score
Buy on Amazon
  • Designed and listed for use with non-metallic sheathed cable in accordance with Article 314 of the National Electrical Code
  • All PVC boxes are permissible for use with 90 Degree C connectors
  • Carlon non-metallic boxes feature PVC construction for easier installation
  • New work
  • Blue
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Shark Supply Co 9.82 Yes Yes Yes

Any DIYer or professional electrician tackling a new construction project needs the Thomas & Betts Carlon non-metallic box to save time and frustration during the rough-in phase. This single-gang blue PVC box is specifically engineered for new work installations involving non-metallic sheathed cable, ensuring you stay fully compliant with National Electrical Code Article 314. The durable PVC construction makes it much easier to manipulate and install compared to older, more rigid alternatives. I particularly like that these boxes are rated for use with 90-degree connectors, which provides much-needed flexibility when navigating tight corners or complex wiring paths. It is a reliable, standard-compliant component that keeps your electrical groundwork organized and code-compliant from the start.

What We Like
Durable PVC construction
NEC compliant design
Supports 90-degree connectors
Single gang capacity
Easy installation

Switch & Outlet Box, Deep Blue, 3-7/8 x 2-1/4 x 3-1/4-In.

Carlon Single Gang PVC Switch and Outlet Box

4.5 (128 ratings)
THOMAS & BETTS B120A-UPC 3.30 X 2.30 X 3.90 inches

Reviews for THOMAS & BETTS (PM Score)

9.5 PM Score
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  • BOX SGL GNG PVC NW 20CU" - 9 Boxes
  • Brand Name: Carlon
  • Height: 3-7/8 in. Width: 2-1/4 in. Depth: 3-1/4 in. Capacity: 20 cu. in.
  • Material: PVC, Number of Gangs: 1 gang
  • Application: Use with Non-Metallic Sheathed Cable
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Vento Group 6.20 No No No

Most people assume electrical installation is all about the wiring, but the foundation of a safe circuit actually starts with the enclosure. These Carlon PVC boxes provide a robust, single-gang solution specifically engineered for use with non-metallic sheathed cable. At 20 cubic inches of capacity, you get a surprisingly generous amount of internal volume for a compact 3-7/8 inch unit, which makes managing wire bends much less frustrating during a kitchen remodel or a quick outlet upgrade. The deep blue color is a distinct identifier, and because they are made from durable PVC, they offer a reliable, non-corrosive housing for your switches and receptacles. Whether you are tackling a DIY project or a professional install, having a pack of nine ensures you won't run out mid-job.

What We Like
20 cubic inch capacity
Durable PVC construction
Single gang design
Non-metallic cable compatible
Nine box pack

DJC Supply Co. 8" x8" x4" Weather & Dust Proof PS Plastic Junction Conduit Box Electronics Enclosure 1 Pack

DJC Supply Co. Weatherproof Polystyrene Electronics Enclosure

4.4 (554 ratings)
DJC SUPPLY

Reviews for DJC SUPPLY (PM Score)

9.4 PM Score
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  • <b><p>✔ STRONG & LIGHTWEIGHT POLYSTYRENE (PS) PLASTIC</b> This space age material is stronger and more durable than many other resin compounds and is considered the lightest among all major plastics
  • <b><p>✔ ENVIRONMENTALLY FRIENDLY & RECYCLABLE</b>Polypropylene is more environmentally friendly than some other plastics. It's recyclable and doesn't release as many toxins as plastics such as PVC.
  • <b><p>✔ SUPERIOR DIELECTRIC INSULATOR STRENGTH</b> Polystyrene has one of the highest electrical insulating strengths from all polymer plastic, ensure the safety and longevity of your equipment with PS!
  • <b><p>✔ RUST PROOF PC PLASTIC:</b> All components including screws are made from strong resilent and rust proof PVC plastic allowing for outdoor and in ground use
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Ares Tech Group USA 9.50 Yes Yes Yes

Most DIYers settle for flimsy resin boxes that crack under the sun, but this DJC Supply Co. enclosure offers a much more resilient alternative. I found the use of polystyrene to be a game changer because it provides incredible dielectric insulator strength, keeping your sensitive electronics safe from electrical issues. It is surprisingly lightweight despite its rugged build, making installation a breeze. Because the entire unit—including the screws—is constructed from rust-proof materials, you can confidently mount this outdoors or even use it in-ground without worrying about corrosion. It is also a much cleaner choice for the environment compared to traditional PVC, as it is recyclable and releases fewer toxins. This is a professional-grade solution for anyone needing a durable, dust-proof home for their gear.

What We Like
Strong polystyrene plastic
Superior electrical insulation
Rust-proof components
Environmentally friendly
Weather and dust proof

Thomas & Betts E971FBDI-2 Drop in Floor Box Kit with Solid Brass Cover, 12 CUIN Capacity, Metallic

Thomas & Betts Brass Drop In Floor Box Kit

4.4 (187 ratings)
THOMAS & BETTS E971FBDIB-2 10.00 X 8.00 X 3.50 Inches 1.10 Pounds

Reviews for THOMAS & BETTS (PM Score)

9.4 PM Score
Buy on Amazon
  • The product is Drop In FLR Box Kit
  • Easy to use
  • The product is manufactured in China
  • Low Voltage Telephone/cable Plate
  • Mounting Screws & 3 Wire Nuts
  • 120VACc, 15A, UL Listed
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Life and Home 9.87 No No No

Imagine you are finishing a high-end living room renovation and realize your floor layout leaves your media cables exposed and tripping hazards everywhere. This Thomas & Betts drop-in kit solves that exact headache by providing a professional, low-voltage telephone and cable solution that sits flush with your flooring. The solid brass cover adds a touch of metallic elegance that standard plastic plates simply cannot match. It is a surprisingly straightforward installation since the kit includes the necessary mounting screws and three wire nuts to get you moving. While it takes about a week to ship, the 12 CUIN capacity and UL-listed 15A rating offer the peace of mind you need for a reliable, safe electrical setup in a high-traffic area.

What We Like
Solid brass cover
Low voltage plate
UL listed
Includes mounting hardware
12 CUIN capacity

DJC Supply Co. ABS 7.9" x 11.8" x 6.3" Waterproof IP67 Hinged PC Plastic Clear Cover Electronics Box with Mounting Plate and Wall Brackets

DJC Supply Co. Waterproof ABS Electronics Enclosure

4.5 (94 ratings)
DJC SUPPLY DJCEBCC

Reviews for DJC SUPPLY (PM Score)

9.2 PM Score
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  • <b><p>✔ STRONG & LIGHTWEIGHT ABS PLASTIC</b> This space age material is stronger and more durable than many other resin compounds and is considered the lightest among all major plastics
  • <b><p>✔BUILT IN REMOVABLE MOUNTING PLATE</b> Preinstalled mounting plate makes it easy to install a variety of electronics and components to the insde of the enclosure box. No need for one? just unscrew the plate and remove
  • <b><p>✔ IP67 WATERPROOF </b> Keep your electronic projects safe and dry with this waterproof and weather proof enclosure rated at IP67
  • <b><p>✔ SUPERIOR DIELECTRIC INSULATOR STRENGTH</b> Polystyrene has one of the highest electrical insulating strengths from all polymer plastic, ensure the safety and longevity of your equipment with ABS!
  • <b><p>✔ 5 YEAR PRODUCT WARRANTY & SUPPORT:</b> Brand New Replacement within 72 Hours If any item becomes defective. 24 Hours Customer Service and Technical Support by Email: support@AresTechGroup.com
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Ares Tech Group USA 9.50 Yes Yes Yes

This IP67-rated protective housing is a standout solution for anyone needing to shield sensitive hardware from the elements in a home improvement or DIY setting. I was particularly impressed by the build quality. The ABS plastic feels incredibly lightweight yet remains much tougher than standard resin compounds. The inclusion of a preinstalled, removable mounting plate is a total game-changer for installation, allowing you to secure components internally without a headache. Because it utilizes high-strength dielectric insulation, you can feel confident about the electrical safety of your gear. Whether you are mounting it to a wall or using it for a standalone project, the weatherproofing provides real peace of mind for long-term outdoor use.

What We Like
IP67 waterproof rating
Removable mounting plate
Durable ABS plastic
High dielectric strength
Includes wall brackets

Thomas & Betts 58-C-7 Single Gang Duplex Receptacle Utility Box Cover

THOMAS & BETTS 58 C 7 4.00 X 2.12 X 0.25 Inches 0.07 Pounds

Reviews for THOMAS & BETTS (PM Score)

8.6 PM Score
Buy on Amazon
  • Includes captivated Phillips head screws
  • Steel
  • Galvanized
  • 4-Inch length x 2-1/8-Inch width
  • 1/4 inch raised
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
UnbeatableSale, Inc 9.83 No No No

ABB INSTALLATION Thomas & Betts E9802E Lamson -CAR Carlon 3/4" Two Gang Box, Pack of 1

Thomas & Betts Carlon Two Gang PVC Box

THOMAS & BETTS E9802E 5.53 X 5.60 X 1.98 Inches 0.49 Pounds

Reviews for THOMAS & BETTS (PM Score)

6.7 PM Score
Buy on Amazon
  • The product is 3/4" PVC FSE 2G Box
  • Material: Non-Metallic
  • All sizes take standard covers and accessories or devices.
  • Integral mounting feet provide easy mounting
  • For dead-end terminations where two devices or additional wiring capacity is required.
  • Material: Non-Metallic
  • All sizes take standard covers and accessories or devices.
  • Integral mounting feet provide easy mounting
  • For dead-end terminations where two devices or additional wiring capacity is required.
  • Standard: E 42728
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
MaxWarehouse 9.82 No No No

You are staring at a blank wall in a basement or garage, needing to run a double outlet for a new workbench setup without the headache of complex mounting. This Thomas & Betts 3/4" two-gang box is designed specifically for those dead-end terminations where you need extra wiring capacity or space for two separate devices. The non-metallic PVC construction keeps things lightweight and corrosion-resistant, while the integral mounting feet take the guesswork out of securing it to your surface. Because it adheres to standard sizing, you won't struggle to find compatible covers or accessories to finish the job. It is a straightforward, reliable solution for any electrical project requiring a sturdy, two-device housing.

What We Like
Integral mounting feet
Non-metallic PVC
Standard device compatibility
Two gang capacity
Easy mounting

Thomas & Betts Bh464A New Work Super Hard Body Wiring Box, 64 Cuin Capacity, Blue

THOMAS & BETTS BH464A 8.75 X 6.25 X 3.50 Inches 0.60 Pounds

Reviews for THOMAS & BETTS (PM Score)

6.7 PM Score
Buy on Amazon
  • The product is 4G New Work Super BLU Box
  • Easy to use
  • The product is manufactured in China
  • 64 CUIN Capacity
  • 14 Cable Clamps & Mounting Nails
  • Resists Flexing & Holds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
MaxWarehouse 9.82 No No No
#18

Thomas & Betts E987R 6" X 6" X 4" Junction Box

THOMAS & BETTS E987R 8.00 X 6.00 X 7.00 Inches 1.00 Pounds

Reviews for THOMAS & BETTS (PM Score)

6.7 PM Score
Buy on Amazon
  • Package Dimensions: 11.43 cm (L) X 15.875 cm (W) X 15.875 cm (H)
  • Package Type: Bearings And Bushings
  • Package Quantity: 1
  • Country Of Origin: United States
  • Model Number: CARE987R
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Sonic Electric 5.09 No No No

THOMAS & BETTS/CARLON 3G4D 1/2 Thomas & Betts Electrical Switch Box, 3 Gang, 44.3 Cu-In, 5-13/16 In L X 4 In W X 2-1/8 In D, 5-13/16" x 4" x 2-1/8"

Thomas & Betts Carlon 3-Gang Electrical Switch Box

THOMAS & BETTS/CARLON 3G4D 1/2 6.75 X 3.25 X 3.50 Inches 1.04 pounds
  • Is long lasting
  • Versatile to use
  • Durable design
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Lifeline Brands 9.87 Yes Yes Yes

The Thomas & Betts Carlon 3-Gang Electrical Switch Box delivers heavy-duty reliability for any serious home electrical project. I found that its 44.3 cubic inch capacity provides ample room for wiring, making it a versatile choice for complex multi-switch setups. The build quality is noticeably robust, leaning into a durable design that feels like it can withstand the rigors of a busy construction site or a long-term residential installation. Whether you are upgrading a kitchen layout or managing a new build, this box stands out because it is engineered to be long-lasting. It avoids the flimsy feel of budget alternatives, ensuring your electrical connections remain secure and protected for years to come.

What We Like
Durable design
Versatile application
Long lasting build
Spacious interior
#21

Carlon B344AB Switch/Outlet Box, New Work, 3 Gang, 5-5/8-Inch Length by 3-3/4-Inch Width by 2-11/16-Inch Depth, Blue

Thomas & Betts Carlon 3-Gang Blue PVC Electrical Box

THOMAS & BETTS B344AB 8.50 X 7.00 X 2.75 Inches 0.38 Pounds

Reviews for THOMAS & BETTS (PM Score)

6.2 PM Score
Buy on Amazon
  • The product is 3G New Work SWT/Out Box
  • Easy to use
  • The product is manufactured in China
  • Carlon non-metallic boxes feature PVC construction for easier installation
  • Designed and listed for use with non-metallic sheathed cable in accordance with Article 314 of the National Electrical Code
  • All PVC boxes are permissible for use with 90 Degree C connectors
  • Blue
  • New work
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Vento Group 6.32 No No No

Any DIYer tackling a large-scale wiring overhaul needs this specific three-gang box to simplify their rough-in process. The PVC construction is a total game-changer compared to traditional metal alternatives because it allows for much smoother, faster installation without the headache of heavy materials. Since it is designed specifically for new work and non-metallic sheathed cable, it aligns perfectly with National Electrical Code Article 314 standards. I found the blue color makes it easy to spot during a busy build, and the fact that it is compatible with 90-degree C connectors is a massive plus for tight corners. It is a straightforward, reliable component that removes the friction from electrical planning.

What We Like
Durable PVC construction
NEC compliant design
Three-gang capacity
Easy installation
90-degree connector compatible
#23

Thomas & Betts E989Ncar 8X8X4 Pvc Junction Box

THOMAS & BETTS E989N-CAR 12.00 X 12.00 X 6.00 Inches 2.60 Pounds

Reviews for THOMAS & BETTS (PM Score)

5.6 PM Score
Buy on Amazon
  • Material: Non-Metallic
  • The first non-metallic junction box UL Listed with a NEMA 6P rating per Section 314, exception of the National Electrical Code
  • Manufactured from PVC or PPO thermoplastic molding compound and featuring foam-in-place gasket lids attached with stainless steel screws
  • Carlon junction box offers all the corrosion resistance and physical properties needed for direct burial applications
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
TOTAL ELECTRIC CORP 5.17 No No No

Thomas & Betts B1Mgext-2 Carlon Gangable Pvc Box Extender, 3-1/4 X 2-1/4, Blue (Pack Of 2)

THOMAS & BETTS B1MGEXT-2 1.50 X 5.80 X 8.50 Inches 1.00 Pounds

Reviews for THOMAS & BETTS (PM Score)

5.6 PM Score
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  • The product is good to use
  • The product is highly durable
  • Manufactured in United States
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Vento Group 6.27 No No No

Thomas & Betts E989Nnj Pvc Molded Screw Cover Junction Box 4 Inch X 4 Inch X 2 Inch Carlon

CARLON E989NNJ-CAR 8.00 X 4.00 X 4.00 Inches 0.52 Pounds

Reviews for CARLON (PM Score)

5.5 PM Score
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  • "LAMSON & SESSION" JUNCTION BOX
  • Exception of the 1999 National Electrical code.
  • Manufactured from PVC or PPO thermoplastic molding compound.
  • Featuring gasket lids attached with stainless steel screws.
  • The rugged enclosures offer all the corrosion resistance and physical properties
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
MaxWarehouse 9.82 No No No
#26

Thomas & Betts 72C17 Pre-Galvanized Steel 2-Gang Two Device Box Cover 4-11/16 Inch X 4-11/16 Inch X 1/2 Inch Steel City

THOMAS & BETTS 72C17

Reviews for THOMAS & BETTS (PM Score)

5.4 PM Score
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  • COUNTRY OF ORIGIN US
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Hearthshire 9.96 No No No

Thomas & Betts RS18-CC Pre-Galvanized Steel Outlet Box Cover 4 Inch x 4 Inch x 1/2 Inch Steel City

Thomas & Betts Steel City Square Outlet Cover

THOMAS & BETTS TS901-3 4.00 X 4.00 X 0.50 Inches 0.30 Pounds

Reviews for THOMAS & BETTS (PM Score)

5.3 PM Score
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  • Square Device Cover
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Sirr0und 9.89 No No No

The cold, rigid weight of pre-galvanized steel immediately signals that this isn't a flimsy plastic alternative. This Thomas & Betts square device cover provides the heavy-duty protection required for professional electrical installations. It fits perfectly over a 4-inch square box, offering a seamless, flush finish that feels incredibly durable underhand. Because it is built from high-quality steel, you don't have to worry about the warping or cracking often seen with cheaper covers in high-traffic areas. It is a straightforward, no-nonsense component that prioritizes structural integrity and long-term reliability in any home improvement project involving electrical housing.

What We Like
Pre-galvanized steel
Square device cover
Durable metal construction
Professional grade
#28

Thomas & Betts 72C1 Pre-Galvanized Steel Flat Box Cover 4-11/16 Inch X 4-11/16 Inch Steel City

THOMAS & BETTS 72 C 1 0.43 Pounds

Reviews for THOMAS & BETTS (PM Score)

5.3 PM Score
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  • If You have the right tools You can complete any job!
  • We have 8 warehouses in the U.S. so you will get your order Fast!
  • Warehouse Locations: <p> Cape Girardeau,MO<p>Medina,OH<p>Lexington,SC<p>Montgomery,NY<p>Dixon,IL<p>Waco,TS<p>Woodburn,OR<p>Mesquite,NV.
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
ShipIQ ✅ 9.81 No No No
#29

Thomas & Betts E98Tscn-Car Polycarbonate 1-Gang Weatherproof Non-Metallic Box Cover 3 Inch X 0.78 Inch X 4.75 Inch Carlon

THOMAS & BETTS E98TSCN-CAR

Reviews for THOMAS & BETTS (PM Score)

5.2 PM Score
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SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
ES Supply Pro 9.75 No No No
#30

Thomas & Betts E996Fr-Ctn 1-Inch Pvc Box Adapter

THOMAS & BETTS E996FR-CTN 1.63 X 1.63 X 1.00 Inches 0.10 Pounds

Reviews for THOMAS & BETTS (PM Score)

5.2 PM Score
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  • The product is 1 inch PVC box Adapter
  • Easy and simple use kit
  • The product is manufactured in United states
  • 1", PVC Box Adapter
  • UPC Polybag
  • Adapts Plastic Conduit To All Electrical Boxes
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
UnbeatableSale Local 9.06 No No No
Buying Guide

A Guide to Selecting the Best Thomas Betts Electrical Boxes

A Guide to Selecting the Best Thomas Betts Electrical Boxes

Material Composition and Durability

The first decision factor in selecting a Thomas Betts box is the material, which is dictated by the environment of your installation. For indoor, dry locations, standard steel boxes are the industry norm due to their cost-effectiveness and structural rigidity. However, if your project involves damp locations, outdoor enclosures, or industrial settings, you must look for non-metallic options like PVC or heavy-duty weatherproof enclosures. Non-metallic boxes are advantageous in residential applications because they are non-conductive and resistant to corrosion, making them ideal for mounting in masonry or wet areas where metal could oxidize over time.

Box Volume and Wire Capacity

One of the most common mistakes in electrical installation is 'box crowding.' Every electrical code requires a specific amount of cubic inch volume per conductor to prevent overheating and wire damage. When browsing the Thomas Betts catalog, pay close attention to the volume capacity. If you are installing high-capacity devices like smart dimmers, motion sensors, or GFCI outlets, these components occupy significantly more space than a standard toggle switch. Always select a box with a higher volume rating than your minimum requirement to allow for easier wire management and to ensure compliance with local safety regulations.

Mounting Method and Installation Type

How the box attaches to your structure will determine which specific product you need. There are three primary mounting categories to consider:

  • New Work Boxes: These are designed to be nailed directly to studs or joists before the drywall is installed. They provide the most secure, permanent mounting.
  • Old Work (Remodel) Boxes: Also known as 'cut-in' boxes, these are essential for retrofitting. They feature 'ears' or adjustable clamps that grip the drywall, allowing you to add an outlet without tearing down entire walls.
  • Surface Mount Boxes: Common in industrial or garage settings, these are designed to be fastened directly to the surface of a wall or ceiling, often used in conjunction with EMT conduit.

Conduit Entry and Knockout Configuration

Thomas Betts is highly regarded for its conduit-ready designs. You must decide whether you need a box with pre-drilled holes, threaded entries, or standard knockouts. For heavy-duty industrial applications, threaded entries provide a more secure, liquid-tight connection for rigid conduit. For residential use, standard knockout boxes allow you to easily punch out holes for Romex or flexible conduit as needed. Ensure the knockout size matches the diameter of the conduit you intend to use to avoid the need for adapters or custom modifications.

Recommendation Logic

To make the final selection, follow this logic: If you are working on a renovation, prioritize Old Work/Remodel boxes with high cubic capacity. If you are working in a basement or outdoor area, prioritize non-metallic or weatherproof rated enclosures. For professional-grade industrial builds, prioritize steel boxes with threaded entries to ensure maximum physical protection for the wiring connections.

Ready to choose?

Jump back to our ranked picks or compare the shortlist side by side.

Frequently Asked Questions

Quick answers about Thomas Betts Electrical Boxes before you buy.

Steel boxes provide superior grounding continuity and durability for exposed conduit runs, while plastic boxes are ideal for residential rough-ins where non-metallic cable is used.

Yes, most Thomas Betts electrical boxes are UL listed, ensuring they meet rigorous safety standards for fire resistance and structural integrity.

While many models are versatile, steel boxes are typically preferred for commercial settings requiring EMT conduit, whereas plastic models are standard for residential framing.

Steel boxes typically include grounding screws for easy connection, while plastic boxes require you to run a dedicated grounding wire to the device.

For standard outlets and switches, a 2.5-inch to 3.5-inch depth is ideal to allow enough room for wire management and device mounting.

Yes, they are available in single-gang, two-gang, and multi-gang configurations to suit various wiring needs.

Use flush-mount boxes when installing during the framing stage, and 'old-work' or 'remodel' boxes when adding electrical to existing drywall.
Research & Insights

Our Analysis of Thomas Betts Electrical Boxes

7,321 Reviews Analyzed
66 Products Evaluated
6.1 Avg PM Score
6 Brands Ranked

Top 10 Thomas Betts Electrical Boxes Brands on Amazon

Share of top-ranked products by brand, from our editorial analysis.

  1. 01 Thomas & Betts 48 (72.7%)
  2. 02 Carlon 10 (15.2%)
  3. 03 Arlington 3 (4.5%)
  4. 04 Djc Supply 2 (3%)
  5. 05 Thomas & Betts/Carlon 2 (3%)
  6. 06 Carlon/Lamson&Sessions 1 (1.5%)

What Our Analysis Found

We've carried out a comprehensive analysis of 7,321 reviews on Thomas Betts Electrical Boxes, using our selection criteria to identify the best options in the electrical equipment. Our findings reveal that most customers typically select Thomas Betts Electrical Boxes priced around $27.88, with top brands including djc supply, carlon and thomas & betts and thomas & betts/carlon.

Our team of expert editors reviewed these high-quality items and handpicked the top 30 Thomas Betts Electrical Boxes for your consideration. We've also done extensive research on numerous sellers, identifying the best ones in the electrical equipment category — including ares tech group usa, century_six, 67 hardware, t4l, life and home, vento group, gatzies, sonic electric and maxwarehouse and total electric corp.

We are dedicated to assisting our users in finding the right boxes Products based on their needs, saving them considerable time when choosing which Thomas Betts Electrical Boxes to buy. We take pride in the number of satisfied users we've helped through our thorough and insightful reviews.

Side by Side

Comparison Table

Compare the top 30 picks at a glance — select a column to sort.

# Product Brand PM Score Rating Where to Buy
1 Thomas & Betts Carlon Low Voltage Old Work Boxes Thomas & Betts 9.8 4.8 (145) Buy on Amazon
2 Thomas & Betts SC100RR Carlon Single Gang Low Voltage Box Thomas & Betts 9.8 4.6 (1,445) Buy on Amazon
3 Thomas & Betts B120AUPC 1G 20 CU in Zip Box W/N (Pack of 100 Thomas & Betts 9.7 4.7 (111) Buy on Amazon
4 Thomas & Betts Carlon Two Gang PVC Box Thomas & Betts 9.7 4.7 (107) Buy on Amazon
5 Thomas & Betts Two-Gang Old Work Electrical Box Thomas & Betts 9.7 4.7 (667) Buy on Amazon
6 Thomas & Betts Blue Non-Metallic Zip Box Pack Thomas & Betts 9.7 4.7 (405) Buy on Amazon
7 Carlon Blue Two-Gang Old Work Electrical Box Carlon 9.7 4.7 (554) Buy on Amazon
8 Carlon Duplex Floor Receptacle Cover in Brown Carlon 9.6 4.6 (311) Buy on Amazon
9 Thomas & Betts #b108r-upc 1g Old Work Shallow Box Thomas & Betts 9.6 4.6 (173) Buy on Amazon
10 Thomas & Betts Carlon Blue Single Gang Electrical Box Thomas & Betts 9.6 4.6 (350) Buy on Amazon
11 Carlon Single Gang PVC Switch and Outlet Box Thomas & Betts 9.5 4.5 (128) Buy on Amazon
12 DJC Supply Co. Weatherproof Polystyrene Electronics Enclosure DJC Supply 9.4 4.4 (554) Buy on Amazon
13 Thomas & Betts Brass Drop In Floor Box Kit Thomas & Betts 9.4 4.4 (187) Buy on Amazon
14 DJC Supply Co. Waterproof ABS Electronics Enclosure DJC Supply 9.2 4.5 (94) Buy on Amazon
15 Thomas & Betts 58-C-7 Single Gang Duplex Receptacle Utility Thomas & Betts 8.6 4.1 (90) Buy on Amazon
16 Thomas & Betts Carlon Two Gang PVC Box Thomas & Betts 6.7 4.8 (37) Buy on Amazon
17 Thomas & Betts BH464A New Work Super Hard Body Wiring Box, 6 Thomas & Betts 6.7 4.5 (43) Buy on Amazon
18 Thomas & Betts E987R 6" X 6" X 4" JUNCTION BOX Thomas & Betts 6.7 4.5 (43) Buy on Amazon
19 Thomas & Betts P27SL4 3 Gang 4X6 Box, 5-13/16-Inch Length by Thomas & Betts 6.6 4.3 (46) Buy on Amazon
20 Thomas & Betts Carlon 3-Gang Electrical Switch Box THOMAS & BETTS/CARLON 6.2 4.4 (36) Buy on Amazon
21 Thomas & Betts Carlon 3-Gang Blue PVC Electrical Box Thomas & Betts 6.2 4.5 (33) Buy on Amazon
22 Thomas & Betts P27SL5 4 Gang 4X8 Box Thomas & Betts 5.9 4.7 (23) Buy on Amazon
23 Thomas & Betts E989NCAR 8X8X4 PVC Junction Box Thomas & Betts 5.6 5.0 (12) Buy on Amazon
24 Thomas & Betts B1MGEXT-2 Carlon Gangable PVC Box Extender, 3 Thomas & Betts 5.6 3.7 (37) Buy on Amazon
25 Thomas & Betts E989NNJ PVC Molded Screw Cover Junction Box 4 Carlon 5.5 4.3 (24) Buy on Amazon
26 Thomas & Betts 72C17 Pre-Galvanized Steel 2-Gang Two Device Thomas & Betts 5.4 4.8 (11) Buy on Amazon
27 Thomas & Betts Steel City Square Outlet Cover Thomas & Betts 5.3 4.4 (17) Buy on Amazon
28 Thomas & Betts 72C1 Pre-Galvanized Steel Flat Box Cover 4-11 Thomas & Betts 5.3 4.7 (11) Buy on Amazon
29 Thomas & Betts E98TSCN-CAR Polycarbonate 1-Gang Weatherproof Thomas & Betts 5.2 5.0 (4) Buy on Amazon
30 Thomas & Betts E996FR-CTN 1-Inch PVC Box Adapter Thomas & Betts 5.2 5.0 (3) Buy on Amazon