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RACO 233 4 in. Square Welded Steel Box, 2-1/8 in. Deep
The RACO 233 is a 4 in. square, welded steel box designed for conduit wiring systems, featuring a 2-1/8 in. deep body with two 3/4 in., two 1/2 in., and eight 1 in. knockouts (KOs) for flexible conduit entry. Built without a mounting bracket, this UL Listed steel box is engineered for durable, code-compliant electrical rough-in work. As part of RACO's line of steel outlet and junction boxes, the 233 provides a reliable enclosure for splices, wiring devices, and conduit connections in commercial and industrial electrical systems.
Key Features
- Trade Size: 4 in. square box for standard junction and outlet box applications.
- Durable Construction: Welded steel body for added strength and rigidity in conduit wiring systems.
- Depth: 2-1/8 in. deep to accommodate wiring devices and conductor fill.
- Knockouts: Two 3/4 in., two 1/2 in., and eight 1 in. KOs provide flexible conduit entry options.
- No Bracket: Bracket-free design for direct mounting in conduit-fed installations.
- Wiring System: Designed for use with conduit wiring systems.
- Square Box Format: Standard 4 in. square footprint suitable for device rings, mud rings, and covers.
- Welded Seams: Welded construction provides a solid, one-piece box body for long-term durability.
Certifications & Compliance
- UL Listed
Technical Specifications
- Product Type: Steel Box
- Product Size: 4 in
- Product Depth: 2.125 in
- Product Shape: Square
- Drawn or Welded: Welded
- Bracket Type: No Bracket
- Wiring System: Conduit
- Knockouts: 1/2 in;3/4 in;1 in
- Certified Listed: UL Listed
Typical Applications
- Commercial and Industrial Electrical Installations
- Conduit Wiring Systems
- Junction and Outlet Box Applications
- Splice and Pull Boxes in Conduit Runs
- New Construction and Renovation Wiring
Why RACO?
RACO's 233 square box is built with welded steel construction and is UL Listed, delivering the strength and code compliance professional electricians rely on for conduit-based rough-in work. Its multiple knockout configuration and durable, bracket-free design make it a dependable choice for demanding commercial and industrial electrical installations. Backed by RACO's reputation for quality steel electrical boxes, the 233 helps ensure long-lasting, reliable connections in demanding job-site environments.
Manufacturer Resources
Spec Sheet
Product Specs
- list_batch:
- RACO-20260916
- Product Type:
- Outlet Box
- Product Size:
- 4 in
- Product Depth:
- 2.125 in
- Product Shape:
- Square
- Drawn or Welded:
- Welded
- Bracket Type:
- No Bracket
- Wiring System:
- Conduit
- Knockouts:
- 1/2 in;3/4 in;1 in
- Certified Listed:
- UL Listed
- Department:
- Electrical
- Product Subgroup:
- Electrical Boxes
- Product Group:
- Boxes & Enclosures
RACO RACO233 – Frequently Asked Questions
1) Will the RACO 233 4 in. square box take 1 in. conduit?
Yes. The 233 comes with eight 1 in. knockouts, plus two 3/4 in. and two 1/2 in., so you can land 1 in. EMT or rigid directly without a reducing washer. The mix of sizes is why it works as a pull or splice point in a run where trade sizes change.
2) Is the RACO 233 box deep enough for conductor fill with several conduits coming in?
At 2-1/8 in. deep in a 4 in. square footprint, the 233 is the deeper of the common 4-square sizes (the shallow version is 1-1/2 in.), so it gives noticeably more cubic-inch capacity for splices, device wiring, and multiple conduit entries. Use the box volume on the RACO spec sheet when you calculate box fill for your conductor count.
3) Does the RACO 233 come with a mounting bracket for stud work?
No bracket. The 233 is a bracket-free box, so it is meant to be supported by the conduit itself or by separate hardware such as a bar hanger or box support. If you are nailing to a wood stud and want the bracket built in, you need a bracketed 4-square instead.
4) Should I use a welded steel box or a drawn box for a conduit job?
The RACO 233 is welded, not drawn. A drawn box is formed from one piece of sheet and is typically shallower; welded construction is what lets the box go to 2-1/8 in. deep with rigid corners that stay square when you tighten locknuts and connectors on several sides. For conduit rough-in in commercial and industrial work, that rigidity is the reason to pick welded.
5) Can I put a standard mud ring or device ring on the RACO 233?
Yes. It is a standard 4 in. square box, so it takes the usual 4-square accessories: raised device rings, mud rings, and flat blank covers. The ring you choose sets the device opening and the plaster depth, and it is ordered separately from the box.
6) What is the correct part number to order a 2-1/8 in. deep 4-square welded steel box from RACO?
Order RACO 233. That number covers the 4 in. square welded steel box at 2-1/8 in. deep with no bracket. There is one configuration, so there is no finish, bracket, or knockout option to specify.
7) Can the RACO 233 be used with NM cable (Romex) instead of conduit?
It is specified for conduit wiring systems, and the openings are knockouts, not cable clamps. If you are running NM cable you would need a box with integral cable clamps or you would have to add a listed NM connector at each knockout. For straight conduit rough-in it is used as-is.
How fast can I get the RACO RACO233 delivered?
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Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the RACO RACO233 come with a warranty?
Absolutely. The RACO RACO233 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the RACO RACO233?
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