Steel City 4" Square Outlet Box, CVX Bracket

The box has a 21 cubic inch volume, which is the number you use for NEC box fill. At 2.00 cubic inches per 14 AWG conductor that works out to 10 conductors, or 8 at 2.25 cubic inches each for 12 AWG, before you subtract for devices, clamps and grounds. Count each device yoke as a double volume allowance and all grounding conductors together as one.

L and R are the bracket orientation, left or right hand, on the CVX stud bracket. Pick the hand that puts the bracket on the correct face of the stud for your layout and keeps the box front flush where you want it. A single box is also sold on its own if you only need one.

Yes. The box measures 4 inches by 4 inches by 1-1/2 inches deep, so it sits well inside the 3-1/2 inch depth of a nominal 2x4 stud cavity and leaves room behind for cable bends. The CVX bracket mounts it to the stud and sets it for the finished wall surface.

No. The Steel City 52151 CVX is a 4 by 4 by 1-1/2 inch steel outlet box with 11 knockouts and 21 cubic inches of volume, bracket-mounted for standard interior wiring. The Appleton GRJ Series and GRJS Series are explosionproof malleable iron conduit outlet boxes intended for hazardous location conduit systems. They serve a different wiring method entirely and are not an interchangeable substitute in an ordinary interior wall or ceiling application.

Eleven knockouts total, in combination 1/2 and 3/4 inch sizes, so you can land either trade size of conduit or connector without an adapter. The box is also set up for AC/MC cable per the product description.

Use the steel 4-square where you are running EMT, AC or MC cable and need the metal raceway path for grounding, and where a 21 cubic inch volume and 11 knockouts give you room to pull through. If the job is residential nonmetallic cable and you want a nonmetallic enclosure, the Cantex EZ Box PVC multi-gang residential outlet box is the alternative. For classified hazardous areas neither applies; that calls for an explosionproof malleable iron box like the Appleton GRJ or GRJS series.

Yes. The box ships as the box with its bracket, so you still order the device ring or flat blank cover separately. Choose the mud ring gang count and raise height to match your device and your finished wall thickness; the raise adds usable volume on top of the box's 21 cubic inches.

They mount similarly on framing but differ in material and configuration. The Steel City 52151 CVX is a 4 inch square steel box, 1-1/2 inches deep, 21 cubic inches, with 11 knockouts for 1/2 and 3/4 inch connectors. The Cantex EZ Box is a PVC multi-gang residential outlet box. Choose the steel square box where metal raceway, armored cable clamps, or a square mud ring cover are involved, and the PVC box where a nonmetallic multi-gang device box fits the wiring method.

Yes, the Steel City 52151 CVX 4-inch square box is made in the United States, which matters if you are working a government or institutional job with domestic sourcing requirements.

The Appleton GRT75 is a malleable iron round conduit outlet box, used where a threaded conduit body and a round cover suit the run. The Steel City 52151 CVX is a 4 by 4 inch square steel box, 1-1/2 inches deep, 21 cubic inches, with 11 knockouts and an integral bracket for fastening to framing. Square boxes accept square covers and mud rings for device mounting; the round iron body is a conduit fitting rather than a framed-in device box.