Steel City 52151 VN 4 SQ BX,STL,21CU,1/2&3/4E-KO SC-BRK

The 52151 VN is a 4 x 4 x 1-1/2 inch steel square box with 21 cubic inches of volume. That volume is what sets your allowable conductor count under box fill rules, so it is the number to work from when you are counting devices, grounds, and clamps into the box.

The box has 11 knockouts, and they are combination 1/2 and 3/4 inch, so you can land either trade size of conduit or a connector of either size without an adapter.

Yes, the 52151 VN is supplied with an integral bracket for fastening to a stud or joist, so you are not buying a separate hanger or bar for a standard wood stud application.

The 52151 VN is a steel 4 inch square outlet box intended for dry indoor work. For an exposed exterior location, the Mulberry Royal Mountie weatherproof outlet box is a die-cast aluminum 1-gang box built for that duty, and the Thomas & Betts 2IH3-1 Red-Dot is a 2-gang conduit outlet box with three 1/2 inch hubs so conduit threads directly into the body rather than entering through a knockout.

The 52151 VN is a UL-listed steel outlet box for general-purpose use, not an explosionproof enclosure. Where a classified area is involved, the Appleton GRJ series and GRJS series conduit outlet boxes are explosionproof malleable iron, and the Appleton GRT75 is a malleable iron round conduit outlet box in the same family of threaded cast boxes.

Yes. The 52151 VN is the box only, and a 4-square opening needs a separate device ring or flat blank cover to finish it. Choose the ring by your wall finish depth and by whether you are mounting one device, two devices, or a blank. Remember that a raised ring adds its own cubic inches on top of the box's 21.

Steel is the usual choice where you are running EMT or MC and need a bonded metallic system, and the 52151 VN handles that with 1/2 and 3/4 inch knockouts and a nail-on bracket. If you are running nonmetallic cable in a house and want a nonconductive box, a PVC unit like the Cantex EZ Series multi-gang residential outlet box is the other direction to go.

The Cantex EZ Box is a PVC multi-gang residential outlet box and is the nonmetallic alternative to a steel box. The difference that matters on the job is the material: the 52151 VN is steel, so the box itself is part of the equipment grounding path and accepts metallic cable and conduit connectors through its knockouts, while a PVC box requires the grounding conductor to be carried through to the devices.

It is sold each, so you can order a single box rather than a full carton. By contrast, the Thomas and Betts Red-Dot 2IH3-1 conduit outlet box is sold in packs of 100.

Manufacturer part number 52151 VN, made in the United States. That MPN matters if your spec or a government job calls for domestic product and standardized box types across a facility.

The 52151 VN is a 4 inch square box, which takes one or two devices with the appropriate cover. If the opening calls for more gangs in one body, the Cantex EZ Box is a multi-gang residential box in PVC, and the Thomas and Betts 2IH3-1 Red-Dot is a 2-gang conduit outlet box with three 1/2 inch hubs.

Both are explosionproof malleable iron conduit outlet boxes. The GRJ series is the standard configuration in that line, while the GRJS is the universal conduit outlet box, intended to cover multiple body configurations from one casting. Either is a cast threaded box rather than a knockout-style steel box like the 52151 VN.

The 52151 VN is sold by the each, so you can order the exact count a job needs. That is a difference worth noting against bulk-packaged boxes such as the Thomas and Betts 2IH3-1 Red-Dot, which is offered as a pack of 100.