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RACO 591 Gangable Steel Switch Box, 3 in. x 2 in., 3-1/2 in. Deep
The RACO 591 is a gangable steel switch box measuring 3 in. x 2 in. and 3-1/2 in. deep, designed for conduit wiring systems in commercial and residential electrical construction. This UL Listed box features two 1/2 in. and eight 3/4 in. knockouts (KO's) for flexible conduit entry, along with integrated plaster ears that allow the box to mount flush with finished wall surfaces. Its gangable configuration lets installers combine multiple 591 boxes side-by-side to build multi-device switch and receptacle assemblies on a single job, saving time on device-heavy layouts. Formed from steel for long-term durability, the 591 is a straightforward, code-compliant choice for new construction and renovation wiring.
Key Features
- Trade Size: 3 in. x 2 in. box body with a 3-1/2 in. depth, sized for standard switch and device installations.
- Durable Construction: Formed steel construction provides strength and long-term durability for conduit-fed installations.
- Knockouts: Two 1/2 in. and eight 3/4 in. KO's give installers flexible conduit entry options on the job.
- Gangable Design: The box gangs together with additional RACO 591 boxes for multi-gang switch and device installations.
- Plaster Ears: Integrated plaster ears position the box flush with finished plaster or drywall surfaces.
- Wiring System: Engineered for use with conduit wiring systems, with no mounting bracket included.
Certifications & Compliance
- UL Listed
Technical Specifications
- Product Type: Steel Boxes and Covers
- Product Depth: 3.5 in
- Bracket Type: No Bracket
- Wiring System: Conduit
- Gangable: Yes
- Certified Listed: UL Listed
Typical Applications
- Commercial and Residential Switch and Device Installations
- Conduit Wiring Systems
- Multi-Gang Device Boxes
- New Construction and Renovation Wiring
Why RACO?
RACO steel boxes are engineered for reliable, code-compliant electrical installations. The gangable 591's UL Listed rating, formed steel construction, and generous knockout layout make it a dependable choice for conduit-fed switch and device wiring in demanding job-site conditions. Electrical professionals count on RACO for consistent quality and dependable performance on every installation.
Manufacturer Resources
Spec Sheet
Product Specs
- list_batch:
- RACO-20260916
- Product Type:
- Switch Box
- Product Depth:
- 3.5 in
- Bracket Type:
- No Bracket
- Wiring System:
- Conduit
- Gangable:
- Yes
- Certified Listed:
- UL Listed
- Department:
- Electrical
- Product Subgroup:
- Electrical Boxes
- Product Group:
- Boxes & Enclosures
RACO RACO591 – Frequently Asked Questions
1) Can RACO 591 switch boxes be ganged together for a 2-gang or 3-gang device layout?
Yes. The RACO 591 is a gangable steel switch box, so you remove the side plates and bolt boxes together to build 2-gang, 3-gang or wider device assemblies from the same part number. That means one SKU covers single and multi-device openings on the same job. If you would rather buy a molded multi-gang box outright, the Allied Moulded 2302-NKV is a fiberglass reinforced 2-gang switch box.
2) Is the RACO 591 meant for conduit or for NM cable?
Conduit. The 591 is built for conduit wiring systems, and its knockout layout reflects that: two 1/2 in. and eight 3/4 in. knockouts for EMT or rigid connectors. There are no cable clamps called out for NM cable, so for a residential romex job a thermoplastic box like the Allied Moulded P-181 FlexBox (18 cu. in., 1-gang) is the closer fit.
3) How deep is the RACO 591, and will it fit in a 2x4 stud wall?
The 591 is 3-1/2 in. deep with a 3 in. x 2 in. body. A nominal 2x4 stud is 3-1/2 in. actual depth, so the box consumes the full stud cavity: with 1/2 in. drywall over it the box sits flush, but there is no room behind it for conduit runs crossing the back of the cavity. For shallower walls or a furred-out application, use a shallower box.
4) Does the RACO 591 come with a mounting bracket or nail-on flange?
No bracket. The 591 ships as a bare gangable box, so you mount it with your own means, typically box support straps, bar hangers, or screws to a stud or strut. It does have plaster ears to set the front flush with finished plaster or drywall. If you need a bracket for steel studs, the Cantex EZ20SB EZ Box is a non-metallic 1-gang steel stud box.
5) What is the closest gangable steel switch box to the RACO 591?
The Steel City Adjust-A-Box LXWOWC-25 from Thomas & Betts is the nearest alternative: it is also a 1-gang gangable switch box, built in pre-galvanized steel. The RACO 591 is a gangable steel switch box 3 in. x 2 in. and 3-1/2 in. deep with two 1/2 in. and eight 3/4 in. knockouts, and it ships with no mounting bracket. The Adjust-A-Box name refers to its adjustable depth positioning, so if you need the box face set relative to a finished wall after rough-in, that is the one to look at; the 591 handles flush positioning with its integrated plaster ears.
6) Is the RACO 591 switch box UL Listed for commercial work?
Yes, the 591 is UL Listed, which is what most inspectors and institutional specs call for on a steel device box in commercial conduit systems.
7) I need a 2-gang box - should I gang two RACO 591 boxes or buy a 2-gang box?
Both routes work, and the choice is usually about wiring method. The RACO 591 is gangable, so two or more of them can be combined side by side to build a multi-device switch or receptacle assembly on a conduit-fed job. If the job is not conduit, a one-piece 2-gang box such as the Allied Moulded 2302-NKV fiberglass reinforced 2-gang switch box gives you the two device positions without assembling anything. For conduit raceway and steel boxes, ganging 591s keeps the whole assembly steel and lets you set exactly as many gangs as the layout calls for.
8) What should I use instead of the RACO 591 when mounting to a steel stud?
The RACO 591 comes with no mounting bracket, so on a steel stud you are providing your own support. The Cantex EZ20SB EZ Box is a 1-gang non-metallic box specifically made for steel stud framing, and it is the better fit if you want a box designed to attach to the stud itself. Keep in mind the EZ20SB is non-metallic, while the 591 is a steel box for conduit wiring systems, so this is a change in wiring method, not just a bracket swap.
9) Is the Allied Moulded P-181 a substitute for the RACO 591?
They serve different jobs. The P-181 FlexBox is a 1-gang thermoplastic residential switch and receptacle box with an 18 cu. in. volume. The RACO 591 is a 3 in. x 2 in. steel box, 3-1/2 in. deep, UL Listed, built for conduit wiring in commercial and residential work and gangable with additional 591 boxes. If you are pulling conduit or need to build a multi-gang steel assembly, the P-181 will not do it; for single-device residential cable work it is the simpler option.
10) Can I use the RACO 591 for a receptacle, not just a switch?
Yes. It is a 3 in. x 2 in. device box, the standard footprint for both switches and receptacles, so a duplex receptacle mounts in it the same way. Ganging multiple 591s builds mixed switch and receptacle assemblies behind a single multi-gang plate.
11) Do I need a separate cover or plate with the RACO 591?
Plan on one. The 591 is the box only, so the device and the wall plate are ordered separately. With a finished wall the plaster ears set the box flush and a standard device plate covers it; for exposed or unfinished work you would add a steel device cover.
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Does the RACO RACO591 come with a warranty?
Absolutely. The RACO RACO591 is backed by a manufacturer’s warranty.
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