PickSmartly Review

Best Thomas Betts Electrical Outlet Boxes in 2026

9.8 PM Score
Products Evaluated
60
Reviews Analyzed
6,591
Brands Ranked
5
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When tackling an electrical renovation or a new construction project, the structural integrity of your wiring depends heavily on the quality of your enclosures. Thomas Betts has established itself as a cornerstone brand for electrical professionals, offering a range of outlet boxes designed to withstand the rigors of both residential and industrial environments. Whether you are looking for a simple replacement for a single-gang wall switch or heavy-duty enclosures for commercial conduits, choosing the right box is critical for ensuring code compliance and long-term safety.

Editor's Choice

Our Top Picks for Thomas Betts Electrical Outlet 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

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
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  • 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
Buy on Amazon
  • 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

Carlon B234ADJ Outlet Box, New Work, 2 Gang, 3-5/8-Inch Length by 5-5/8-Inch Width by 3-Inch Depth, Blue

Thomas & Betts Carlon 2-Gang Adjustable Outlet Box

4.6 (167 ratings)
THOMAS & BETTS B234ADJ 5.80 X 4.80 X 3.00 Inches 0.40 Pounds

Reviews for THOMAS & BETTS (PM Score)

9.6 PM Score
Buy on Amazon
  • Patented design allows for adjustment from 0 to 1-3/4-Inch after installation
  • Ideal for new work or retrofit (old work) applications
  • Backless low voltage bracket and floor box designs available
  • Ideal for various drywall thicknesses and wall finishes
  • All PVC boxes are permissible for use with 90 degree C connectors
  • Patented design allows for adjustment from 0 to 1-3/4-Inch after installation
  • Ideal for new work or retrofit (old work) applications
  • Backless low voltage bracket and floor box designs available
  • Ideal for various drywall thicknesses and wall finishes
  • All PVC boxes are permissible for use with 90 degree C connectors
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
You Got Yourself A Deal 9.85 Yes Yes Yes

You are halfway through a drywall installation when you realize the outlet needs to sit slightly deeper or shallower to match the finished wall thickness. This is exactly where the Thomas & Betts Carlon adjustable outlet box saves your sanity. Instead of tearing out finished work, you can utilize its patented design to adjust the depth from 0 to 1-3/4 inches even after the box is installed. It is a versatile blue PVC solution that works equally well for new construction or retrofit projects. Whether you are dealing with varying drywall thicknesses or need a reliable housing for your 2-gang setup, the ability to fine-tune the positioning mid-project is a massive time-saver. It even plays nice with 90-degree C connectors, making it a robust choice for professional electrical layouts.

What We Like
Post-installation adjustment
Versatile retrofit use
Adjustable depth range
Compatible with 90-degree connectors
Dual-purpose application

Carlon B121ADJ Outlet Box, New Work, 1 Gang, 3-3/4-Inch Length by 3-7/8-Inch Width by 3-3/8-Inch Depth, Blue

Thomas & Betts Carlon Adjustable Single Gang Outlet Box

4.6 (114 ratings)
THOMAS & BETTS B121ADJ 3.80 X 3.00 X 2.30 Inches 0.40 Pounds

Reviews for THOMAS & BETTS (PM Score)

9.6 PM Score
Buy on Amazon
  • The product is SGL Gang ADJ Box
  • Easy to use
  • The product is manufactured in China
  • Patented design allows for adjustment from 0 to 1-3/4-Inch after installation
  • Ideal for new work or retrofit (old work) applications
  • Backless low voltage bracket and floor box designs available
  • Ideal for various drywall thicknesses and wall finishes
  • All PVC boxes are permissible for use with 90 degree C connectors
  • Patented design allows for adjustment from 0 to 1-3/4-Inch after installation
  • Ideal for new work or retrofit (old work) applications
  • Backless low voltage bracket and floor box designs available
  • Ideal for various drywall thicknesses and wall finishes
  • All PVC boxes are permissible for use with 90 degree C connectors
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Vento Group 6.32 No No No

Most electrical installers dread the moment they realize a wall is slightly thicker than expected, but this adjustable outlet box turns that potential headache into a non-issue. The real magic lies in its patented design, which allows you to adjust the depth from zero to 1-3/4 inches even after the box is already installed. Whether you are tackling a brand-new construction project or a tricky retrofit in an existing room, this single gang unit adapts to various drywall thicknesses and finishes with ease. It is a rugged PVC solution that even plays well with 90-degree C connectors. Instead of fighting with uneven wall depths, you can simply fine-tune the placement for a perfectly flush finish every single time.

What We Like
Patented adjustable design
Post-installation depth adjustment
Versatile retrofit application
Fits various drywall thicknesses
Compatible with C connectors

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

Carlon BH118R Outlet Box, Old Work, 1 Gang, 3-7/8-Inch Length by 2-3/8-Inch Width by 3-5/8-Inch Depth, Blue

Thomas & Betts Carlon Blue Single Gang Old Work Outlet Box

4.6 (131 ratings)
THOMAS & BETTS BH118R 4.30 X 6.30 X 3.50 Inches 0.30 Pounds

Reviews for THOMAS & BETTS (PM Score)

9.6 PM Score
Buy on Amazon
  • The product is 18CUIN BLU SGL G Box
  • Easy to use
  • The product is manufactured in China
  • Largest wire fill capacity in their class
  • Wont crack or break in extreme environments
  • Resists flexing, hold their shape
  • Molded-in flanges and clamps
  • Faster installation
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Lifeline Brands 9.85 Yes Yes Yes

After weeks of use on various residential renovation projects, the durability of this Carlon single gang outlet box has become undeniably clear. This blue old work box stands out because it manages to offer the largest wire fill capacity in its class, which is a massive relief when you are dealing with crowded electrical runs. The molded-in flanges and clamps make the installation process significantly faster than standard alternatives, saving a lot of time on the job site. Even in more demanding settings, the material resists flexing and maintains its shape without cracking or breaking. It is a reliable, easy-to-use component that feels built to withstand extreme environments without compromising on structural integrity.

What We Like
Large wire capacity
Molded-in clamps
Resists flexing
Fast installation
Durable construction

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
#14

4" Octagon Box Blank Cover, Steel

Thomas & Betts Steel Octagon Box Blank Cover

4.5 (101 ratings)
THOMAS & BETTS 54 C 1 100.00 X 4.00 X 1.00 Inches 1.00 Pounds

Reviews for THOMAS & BETTS (PM Score)

9.5 PM Score
Buy on Amazon
  • 4-Inch Octagon Cover Plate
  • Pre-Galvanized Steel
  • Fits 4-Inch Octagon Boxes
  • 1-Pack
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
toomanyamps 9.18 No No No

The Thomas & Betts 4-inch octagon box blank cover is a rugged, pre-galvanized steel solution for any electrical installation needing a clean finish. I found that the pre-galvanized coating provides a reliable layer of protection against corrosion, which is essential for maintaining the integrity of your junction boxes over time. It fits standard 4-inch octagon boxes perfectly, ensuring a flush and professional look that doesn't compromise on durability. Since it is made of heavy-duty steel, you aren't dealing with the flimsy feel of plastic alternatives. Whether you are finishing up a DIY project or working on a professional job site, this single-pack cover offers the straightforward, industrial-grade reliability you expect from a trusted brand in the home improvement space.

What We Like
Pre-galvanized steel
Fits octagon boxes
Durable metal construction
Industrial grade

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
Buy on Amazon
  • 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

Arlington FLBAF101BR-1 Adjustable Floor Box Kit with Outlet and Flip Plate, for Installed Floors, 1-Gang, Brown,plastic,1-Pack

Arlington Adjustable 1-Gang Floor Box Kit

4.4 (433 ratings)
ARLINGTON FLBAF101BR 4.66 X 3.75 X 4.05 Inches 0.45 Pounds

Reviews for ARLINGTON (PM Score)

9.4 PM Score
Buy on Amazon
  • 1-Gang Brown Adjustable Floor Box Kit with Outlet and Flip Plate for Installed Floors
  • Cover gasket prevents water intrusion, plate protects outlet when not being used
  • Box is designed for installed flooring, we offer floor boxes for new concrete and nearly any jobsite
  • Oversized covers hide miscut carpet for floor
  • For a neat, convenient way to put a receptacle(outlet) in the floor
  • Non-Metallic Oversized covers hide miscut carpet for floor
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
ES Supply Pro 9.76 No No No

Most people assume installing floor outlets requires a perfect, surgical cut in your flooring, but this Arlington kit actually rewards a little bit of breathing room. The non-metallic, oversized covers are a total lifesaver because they easily hide those inevitable miscuts in your carpet or flooring that usually ruin a room's aesthetic. It is specifically engineered for already installed floors, making it a much less daunting DIY task than working with raw concrete. I really like how the flip plate keeps the outlet protected when you aren't using it, and the included cover gasket provides peace of mind against water intrusion. It is a remarkably neat way to bring power exactly where you need it without leaving a messy, visible gap in your floor.

What We Like
Oversized cover design
Water intrusion gasket
Protective flip plate
Installed floor compatible
Non-metallic construction
#17

Carlon B117RSW Work Outlet Box, 1 Gang, 3.64-Inch Length by 4.07-Inch Width by 2-Inch Depth, Blue

Thomas & Betts Carlon Single Gang Old Work Outlet Box

4.4 (105 ratings)
THOMAS & BETTS B117RSW 36.00 X 4.20 X 4.30 Inches 0.10 Pounds

Reviews for THOMAS & BETTS (PM Score)

9.4 PM Score
Buy on Amazon
  • The product is Single Gang Shallow Old Work Flanged Box, 17 CUIN Capacity, Depth 2", Width 4-1/4", Length 4"
  • 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
  • 1 gang
  • 3. 64 inch length x 4. 07 inch width x 2 inch depth
  • 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
  • 1 gang
  • 3.64 inch length x 4.07 inch width x 2 inch depth
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Vento Group 6.32 No No No

Most DIYers assume electrical work requires heavy-duty metal components, but the right PVC construction can actually make your renovation much smoother. This Carlon single gang shallow box is a lifesaver for old work projects where you can't easily access the wall cavity. The flanged design is incredibly easy to use, and because it's built from non-metallic PVC, it won't fight you during installation like stiffer materials might. It is specifically designed for use with non-metallic sheathed cable per National Electrical Code Article 314, ensuring you stay compliant. At a 2-inch depth with a 17 CUIN capacity, it provides just enough room for your wiring and 90 Degree C connectors without taking up excessive wall space.

What We Like
Durable PVC construction
Easy installation
NEC compliant design
Shallow flanged profile
Single gang capacity

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

Carlon Lamson & Sessons B108B-UPC Single Gang Shallow Switch & Outlet Box With Bracket

Carlon Single Gang Shallow Electrical Box with Bracket

4.7 (85 ratings)
CARLON B108B-UPC 6.50 X 2.50 X 1.30 Inches 0.10 Pounds

Reviews for CARLON (PM Score)

9.0 PM Score
Buy on Amazon
  • Thomas & Betts
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Vento Group 6.42 No No No

DIY renovators working in tight wall cavities need the Carlon Lamson & Sessons shallow box to avoid the headache of deep structural obstructions. This single gang unit is a lifesaver when you are retrofitting switches or outlets into spaces where a standard deep box simply won't fit. Because it comes equipped with a sturdy mounting bracket, installation feels much more secure and predictable than cheaper, flimsy alternatives. Being a Thomas & Betts brand product, you can trust the build quality is up to professional standards. It is an affordable, essential component for anyone tackling electrical updates in shallow wall spaces without wanting to tear out large sections of drywall.

What We Like
Shallow profile design
Includes mounting bracket
Single gang capacity
Thomas & Betts brand

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

Carlon Lamson & Sessons B114RR-UPC Single Gang Old Work Box

Carlon Single Gang Old Work Electrical Box

4.5 (57 ratings)
CARLON B114R-UPC 14.00 X 2.30 X 4.10 Inches

Reviews for CARLON (PM Score)

7.4 PM Score
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  • Carlon 1-Gang 14 cu. in. Old Work Box
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
ALAN BUILDS 3.10 Yes Yes Yes

Most DIY electrical upgrades fail because of poor structural support, but this Carlon single gang box solves that problem before you even pull your wires through. It is a specialized tool for the 'old work' scenario, meaning you don't have to tear down entire walls just to add a new outlet or switch. With a 14 cubic inch capacity, it provides just enough internal volume to manage your connections comfortably without feeling cramped. The design focuses on stability within existing drywall, making it an essential component for any renovation where you need to mount hardware into pre-existing surfaces. It is a straightforward, no-nonsense solution for anyone looking to expand their home's electrical footprint without a massive demolition project.

What We Like
14 cubic inch capacity
Single gang design
Old work installation
Carlon brand reliability

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

Steel City 59361-1/2 Handy/Utility Outlet Box Extension Ring, Drawn Construction, 4-Inch Length by 2-1/8-Inch Width by 1-7/8-Inch Depth, Galvanized

Thomas & Betts Galvanized Steel Utility Outlet Extension

THOMAS & BETTS 593611/230 4.00 X 3.00 X 3.00 Inches 0.35 Pounds

Reviews for THOMAS & BETTS (PM Score)

6.3 PM Score
Buy on Amazon
  • Steel
  • Galvanized
  • 13 cubic-Inch capacity
  • Drawn construction
  • (3) 1/2 inch each side, (1) 1/2 inch each end knockouts
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Vento Group 6.32 No No No

You are halfway through a kitchen remodel when you realize your existing electrical boxes are sitting too deep behind the new backsplash. This Thomas & Betts extension ring solves that headache immediately by adding the necessary depth to your electrical setup. The drawn construction ensures a smooth, seamless fit, and the galvanized steel build provides the rugged durability needed for residential or commercial wiring. With a 13 cubic-inch capacity and four 1/2-inch knockouts—three on the sides and one on the end—it offers plenty of flexibility for routing your wires without a struggle. It is a straightforward, heavy-duty solution that makes leveling out your outlets feel like a much simpler task than it otherwise would be.

What We Like
Galvanized steel construction
Drawn metal design
13 cubic-inch capacity
Four 1/2-inch knockouts
Durable utility ring

Arlington Industries Arlington FLB3520MB-1 Round Cut Box Kit Cover and Threaded Plugs, for Installed Floors, 1-Gang, Metallic Brass, 1-Pack

Arlington Metallic Brass Round Floor Box Kit

ARLINGTON FLB3520MB-1 3.99 X 3.99 X 3.17 Inches 0.75 Pounds

Reviews for ARLINGTON (PM Score)

6.3 PM Score
Buy on Amazon
  • 1-Gang round floor box kit
  • For existing wood and concrete floors
  • Ready to install - installation hardware included
  • For a neat, convenient way to put a receptacle (outlet) in the floor
  • Metallic Brass metal cover and threaded plugs
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Benefast, Inc. 5.41 No No No

Most people assume adding an outlet to a finished floor requires a massive construction project, but this kit proves otherwise. The Arlington round floor box kit is a specialized solution designed specifically for existing wood or concrete surfaces, making it a lifesaver for retrofitting power into a room that was never wired for it. The metallic brass finish isn't just functional. It adds a sophisticated, intentional look to the floor rather than looking like a makeshift repair. Because it comes ready to install with all the necessary hardware included, you can avoid the headache of hunting down compatible components. It turns a messy electrical necessity into a neat, convenient feature that blends seamlessly into your home's design.

What We Like
Metallic brass finish
Existing floor installation
Hardware included
One-gang design
Threaded plugs included

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

Carlon B118B-Upc Switch/Outlet Box, New Work, 1 Gang, 3-3/4-Inch Length By 2-1/4-Inch Width By 2-15/16-Inch Depth, Blue

THOMAS & BETTS B118B-UPC 16.00 X 12.13 X 12.00 Inches

Reviews for THOMAS & BETTS (PM Score)

6.2 PM Score
Buy on Amazon
  • 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 6.22 No No No

Carlon B232A-UPC Switch/Outlet Box, New Work, 2 Gang, 3-3/4-Inch Length by 4-Inch Width by 3-Inch Depth, Blue

Thomas & Betts Carlon Blue 2-Gang Electrical Box

THOMAS & BETTS B232A-UPC

Reviews for THOMAS & BETTS (PM Score)

5.6 PM Score
Buy on Amazon
  • 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
Commercial Supply Company 9.54 No No No

Roughing-in a new kitchen renovation requires electrical components that won't crack or complicate your workflow when you're mounting them into fresh studs. This Thomas & Betts Carlon 2-gang box is built specifically for new work installations, utilizing a durable PVC construction that makes the mounting process much smoother than traditional metal alternatives. The blue color makes it easy to identify on a busy job site, and the non-metallic design ensures it is fully compliant with National Electrical Code Article 314 standards for sheathed cable. Because it is compatible with 90-degree C connectors, you have much more flexibility when routing your wiring through tight spaces. It is a reliable, straightforward solution for any homeowner or professional tackling a heavy-duty electrical layout.

What We Like
Durable PVC construction
NEC compliant design
Two-gang capacity
90-degree connector compatible
Easy installation
Buying Guide

A Guide to Selecting the Best Thomas Betts Electrical Outlet Boxes

A Guide to Selecting the Best Thomas Betts Electrical Outlet Boxes

Understanding Material Composition

The first decision factor in selecting a box is the material, which is dictated by your specific installation environment. For standard residential dry locations, non-metallic (plastic) boxes are often the go-to due to their ease of installation and resistance to corrosion. However, if you are working in a commercial setting or an area where physical durability is paramount, metal boxes are the industry standard. Metal boxes provide superior grounding capabilities and are much more resistant to impact, making them ideal for exposed conduit runs or high-traffic areas.

Box Volume and Capacity (Cubic Inch Rating)

One of the most common mistakes in electrical DIY is selecting a box that is too small for the number of conductors being pulled through it. Every electrical box has a volume rating, measured in cubic inches. This rating determines how many wires, ground connections, and devices (like dimmers or smart switches) can safely fit inside without creating a fire hazard due to overheating. When selecting your boxes, always check the capacity. If you plan on installing bulky smart home dimmers or multiple heavy-gauge wires, opt for a 'deep' box rather than a standard shallow version to ensure you have enough room for proper wire management.

Mounting Styles and Installation Methods

How the box attaches to your structure is just as important as the box itself. You will generally encounter three main mounting styles:

  • New Work Boxes: These are designed to be nailed directly to studs or joists before the drywall is installed. They offer the most secure attachment.
  • Old Work (Remodel) Boxes: These feature 'ears' or 'wings' that grip the backside of the drywall. They are essential when you are adding an outlet to an existing finished wall without tearing out the studs.
  • Surface Mount Boxes: Common in industrial or garage settings, these are designed to be mounted directly onto the face of a wall, typically used with EMT (Electrical Metallic Tubing) conduit.

Gauge and Conduit Compatibility

If you are using a conduit system, you must ensure the box features the correct knockouts. Thomas Betts offers boxes with various knockout sizes to accommodate different diameters of conduit. Using a box with knockouts that are too large can compromise the integrity of the seal, while knockouts that are too small will prevent a proper fit. For residential projects using Romex (NM cable), ensure you are selecting boxes specifically rated for non-metallic sheathed cable, which often include built-in clamps to secure the wire and prevent tension on the connections.

Summary Recommendation Logic

To make the right choice, follow this logic: If you are working in a finished room, prioritize Old Work plastic boxes with high cubic inch capacity. If you are wiring a basement or a garage with exposed pipes, prioritize metal boxes with compatible conduit knockouts. For any professional-grade installation, always prioritize boxes that meet UL listing requirements to ensure your project remains up to local electrical codes.

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 Outlet Boxes before you buy.

A single-gang box is designed to house one electrical device, such as a single outlet or switch, while multi-gang boxes are wider to accommodate two or more devices side-by-side.

Yes, most options include both 'new work' boxes, which feature nails for securing to studs, and 'old work' (remodel) boxes, which use clamps to grip existing drywall.

While the material of the box dictates the wiring method, most residential applications use non-metallic (NM) cable with plastic boxes, whereas metal boxes are required for armored cable or conduit systems.

If you are installing smart switches or dimmers, look for 'deep' boxes. These provide extra volume to accommodate the bulky wiring and larger device bodies required by modern electronics.

Yes, high-quality electrical boxes are manufactured from flame-retardant materials designed to meet strict building safety codes and prevent the spread of fire.

Standard single-gang boxes typically come with integrated mounting tabs, but if you are using specialized heavy-duty or industrial boxes, you may need specific screws or brackets.

Standard indoor boxes are not waterproof. For outdoor use or areas near water, you must specifically select 'weatherproof' or 'wet-location' rated boxes with gasketed covers.
Research & Insights

Our Analysis of Thomas Betts Electrical Outlet Boxes

6,591 Reviews Analyzed
60 Products Evaluated
6.0 Avg PM Score
5 Brands Ranked

Top 10 Thomas Betts Electrical Outlet Boxes Brands on Amazon

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

  1. 01 Thomas & Betts 45 (75%)
  2. 02 Carlon 9 (15%)
  3. 03 Arlington 3 (5%)
  4. 04 Thomas & Betts/Carlon 2 (3.3%)
  5. 05 Carlon/Lamson&Sessions 1 (1.7%)

What Our Analysis Found

We've carried out a comprehensive analysis of 6,591 reviews on Thomas Betts Electrical Outlet 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 Outlet Boxes priced around $27.57, with top brands including arlington, 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 Outlet Boxes for your consideration. We've also done extensive research on numerous sellers, identifying the best ones in the electrical equipment category — including benefast, inc., amamax (usa) since 1993 l imbaprice® authorized distributor, es supply pro, century_six, s & k surplus, life and home, vento group, aserson and quality distributing llc and gatzies.

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 Outlet 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 B120AUPC 1G 20 CU in Zip Box W/N (Pack of 100 Thomas & Betts 9.7 4.7 (111) Buy on Amazon
3 Thomas & Betts Carlon Two Gang PVC Box Thomas & Betts 9.7 4.7 (107) Buy on Amazon
4 Thomas & Betts Two-Gang Old Work Electrical Box Thomas & Betts 9.7 4.7 (667) Buy on Amazon
5 Thomas & Betts Blue Non-Metallic Zip Box Pack Thomas & Betts 9.7 4.7 (405) Buy on Amazon
6 Carlon Blue Two-Gang Old Work Electrical Box Carlon 9.7 4.7 (554) Buy on Amazon
7 Switch & Outlet Box, Deep Blue, 3-7/8 x 2-1/4 x 3-1/4-In. Thomas & Betts 9.7 4.7 (320) Buy on Amazon
8 Thomas & Betts Carlon 2-Gang Adjustable Outlet Box Thomas & Betts 9.6 4.6 (167) Buy on Amazon
9 Thomas & Betts Carlon Adjustable Single Gang Outlet Box Thomas & Betts 9.6 4.6 (114) Buy on Amazon
10 Carlon Duplex Floor Receptacle Cover in Brown Carlon 9.6 4.6 (311) Buy on Amazon
11 Thomas & Betts Carlon Blue Single Gang Old Work Outlet Box Thomas & Betts 9.6 4.6 (131) Buy on Amazon
12 Thomas & Betts #b108r-upc 1g Old Work Shallow Box Thomas & Betts 9.6 4.6 (173) Buy on Amazon
13 Thomas & Betts Carlon Blue Single Gang Electrical Box Thomas & Betts 9.6 4.6 (350) Buy on Amazon
14 Thomas & Betts Steel Octagon Box Blank Cover Thomas & Betts 9.5 4.5 (101) Buy on Amazon
15 Carlon Single Gang PVC Switch and Outlet Box Thomas & Betts 9.5 4.5 (128) Buy on Amazon
16 Arlington Adjustable 1-Gang Floor Box Kit ARLINGTON 9.4 4.4 (433) Buy on Amazon
17 Thomas & Betts Carlon Single Gang Old Work Outlet Box Thomas & Betts 9.4 4.4 (105) Buy on Amazon
18 Thomas & Betts Brass Drop In Floor Box Kit Thomas & Betts 9.4 4.4 (187) Buy on Amazon
19 Carlon Single Gang Shallow Electrical Box with Bracket Carlon 9.0 4.7 (85) Buy on Amazon
20 Thomas & Betts 58-C-7 Single Gang Duplex Receptacle Utility Thomas & Betts 8.6 4.1 (90) Buy on Amazon
21 Carlon Single Gang Old Work Electrical Box Carlon 7.4 4.5 (57) Buy on Amazon
22 Thomas & Betts Carlon Two Gang PVC Box Thomas & Betts 6.7 4.8 (37) Buy on Amazon
23 Thomas & Betts BH464A New Work Super Hard Body Wiring Box, 6 Thomas & Betts 6.7 4.5 (43) Buy on Amazon
24 Thomas & Betts P27SL4 3 Gang 4X6 Box, 5-13/16-Inch Length by Thomas & Betts 6.6 4.3 (46) Buy on Amazon
25 Thomas & Betts Galvanized Steel Utility Outlet Extension Thomas & Betts 6.3 4.6 (34) Buy on Amazon
26 Arlington Metallic Brass Round Floor Box Kit ARLINGTON 6.3 4.4 (38) Buy on Amazon
27 Thomas & Betts Carlon 3-Gang Electrical Switch Box THOMAS & BETTS/CARLON 6.2 4.4 (36) Buy on Amazon
28 Carlon B118B-UPC Switch/Outlet Box, New Work, 1 Gang, 3-3/4- Thomas & Betts 6.2 4.3 (37) Buy on Amazon
29 Thomas & Betts P27SL5 4 Gang 4X8 Box Thomas & Betts 5.9 4.7 (23) Buy on Amazon
30 Thomas & Betts Carlon Blue 2-Gang Electrical Box Thomas & Betts 5.6 4.8 (16) Buy on Amazon