Steel City 541511234-25R 4 STEEL OCTAGON BOX

The Steel City 541511234-25R octagon box has a 15.8 cubic inch volume. Using the NEC box fill allowances, that works out to 7 No. 14 conductors (2.00 in3 each), 6 No. 12 (2.25 in3 each), or 5 No. 10 (2.50 in3 each) before you have to count devices, clamps, or a fixture stud. Remember all grounds together count as one conductor and a strap or stud counts as two.

It is a shallow box: 4 inches in diameter by 1/2 inch deep. That depth is meant for situations where you cannot get a standard 1-1/2 inch deep box in, such as mounting on a concrete deck, over furring, or against structural framing. With only 15.8 cubic inches you have room for the splices on a simple two-cable fixture feed, but a fixture canopy with a lot of pigtails and a stud will fill it fast. For a typical joist-bay ceiling fixture a deeper octagon box gives you more working room.

Yes. The 541511234-25R carries UL listing under file E2969, so it satisfies the listed-outlet-box requirement an inspector looks for on a rough-in.

Drawn steel, finished in a silver (zinc) appearance. Because the body is metal, it bonds through the raceway or armor, so it works with EMT, rigid, and MC where a nonmetallic box would not. Grounding still has to be carried to the box per code.

It is a 4 inch octagon, which is the standard North American outlet box size, so standard 4 inch octagon and round blank covers, fixture covers, and ceiling fan-rated adapters built for 4 inch octagon boxes line up with it. Covers made for 4-11/16 inch boxes or for 4 inch square boxes will not match.

Drawn means the box is formed from a single piece of steel with no corner seams, which is why these shallow 1/2 inch octagons hold their shape and have no joints to open up. Welded boxes are assembled from separate pieces and are more common in deeper or gangable designs. For a shallow pancake-style ceiling or wall outlet, drawn is the normal construction.

Pricing and shipping are per box: the selling unit of measure is each, under manufacturer part number 541511234-25R. If you are roughing in a whole floor, order the quantity you need in eaches.

Country of origin is Canada. That matters on public and institutional jobs with domestic or trade-agreement sourcing language in the spec, so it is worth noting on the submittal.