Steel City GW 235 G STL GANGABLE MSNRY BOX 22 CU-IN

The GW 235 G is a 22 cubic inch steel masonry box, which is a generous volume for a single-gang masonry opening. Box fill is what governs how many conductors you can land, and 22 cubic inches is enough room for a device plus pigtails on typical 12 or 14 AWG branch circuit work. Confirm your count against the fill table for the wire size you are running.

Plan the pocket around 3-3/4 x 3-3/4 x 3-1/2 inches, which is the box's stated size. In block or brick work that means the box sets into a standard concrete block cell or a cut pocket at least that deep, with the 3-1/2 inch dimension being the depth into the wall.

Yes. The GW 235 G is a gangable masonry box, so the sides come off and boxes join to build multi-gang openings for two or more devices in the same block pocket. Non-gangable masonry boxes cannot do this, so if your drawing calls for a two or three gang plate in block, the gangable version is the one to order.

The box carries UL listing under file E2969, which is what an inspector or a spec writer on a school, hospital, or government job will look for on concealed masonry boxes.

Twenty knockouts, spread across the sides and back, so you have plenty of routing choices for EMT or NM entering from above, below, or behind in a block wall. That count is why it works for through-wall runs where conduit continues past the device instead of dead-ending at it.

Use the masonry box. Boxes of this type are shaped and sized to set into the cell of a concrete block or a cut masonry pocket and be grouted or mortared in place, which a standard drawn switch box with bracket or nail-on ears is not built to do. The GW 235 G is steel and 22 cubic inches, so you get commercial-duty material and full device fill in that masonry-specific form.

It is sold each, so you can order the exact count for the openings on a job rather than buying a full carton.

Canada. That matters on public work with domestic or trade-agreement sourcing language in the spec, so it is worth noting on submittals.

It comes in a silver steel finish, the usual galvanized-look coating on concealed boxes. Since a masonry box is buried in the wall with only the device and plate showing, the finish is there for handling and corrosion during construction, not appearance.