Steel City 52151 BN 4-Inch Square Steel Outlet Box, 21 in³, NMSC Clamp

It comes with built-in NMSC clamps, so nonmetallic sheathed cable lands directly in the box with no separate cable connectors to buy. If you are pulling EMT or armored cable instead, use a plain box with knockouts and the appropriate fittings rather than a clamp-equipped box.

With 21 cubic inches, NEC box fill math allows up to ten 14 AWG conductors (2.00 in3 each) or nine 12 AWG conductors (2.25 in3 each) before deductions. Remember each device counts as two conductors of the largest wire size, all grounds together count as one, and clamps count as one, so a single receptacle fed and switched gets tight quickly.

No. This is a steel interior outlet box with NM cable clamps and open knockouts, meant for dry indoor framed walls and ceilings. For an exterior or wet location, use a weatherproof box such as the Mulberry Royal Mountie die-cast aluminum weatherproof outlet box or a Thomas & Betts Red-Dot hub box.

No. The Steel City 52151 BN is a 21 cubic inch steel outlet box with a cable clamp, intended for ordinary locations. Classified areas call for an explosionproof enclosure such as the Appleton GRJ series or GRJS series malleable iron conduit outlet boxes, or the Appleton GRT75 malleable iron round conduit outlet box.

The Steel City 52151 BN is a 4-inch square steel outlet box with an NMSC clamp and a bracket, built for dry interior framing work with non-metallic sheathed cable. For an exterior wall, the Mulberry Royal Mountie weatherproof outlet box is a 1-gang die-cast aluminum box made for weather exposure, and the Thomas & Betts 2IH3-1 Red-Dot is a 2-gang conduit outlet box with three 1/2-inch hubs for threaded conduit runs outdoors.

Yes, it carries a B bracket, which is the flat bracket that nails to the face of a wood stud and sets the box at the right depth for drywall. You do not need separate box hangers or a bar hanger for standard stud framing.

There are 11 knockouts across the sides and back, so you have plenty of entry points for additional runs. The box itself is the NM-clamp version, so conduit entries would use the knockouts with the appropriate connectors.

The 52151 BN carries UL listing E2969, and it is a steel box made in the United States. That covers the spec-compliance box on most commercial and institutional submittals for a standard 4-square outlet box.

Steel like the 52151 BN is the choice where you want a metal raceway path, a mechanically tough box, or a spec-grade metallic system, and it accepts standard 4-square covers and mud rings. If you want nonmetallic for a residential multi-gang wall, the Cantex EZ Series PVC multi-gang residential outlet box is the alternative. Note that a nonmetallic box does not serve as an equipment ground path.

For a dedicated range or dryer outlet, the Pass & Seymour P242RRD range and dryer box is the purpose-built thermoplastic option. The Steel City 52151 BN is a general-purpose 4-inch square steel box at 21 cubic inches with eleven knockouts and an NMSC clamp, so it is sized and configured for standard device and junction work rather than for a range or dryer assembly.

The Steel City 52151 BN is a 4-inch square steel box with eleven knockouts and a built-in NMSC clamp, so cable enters through a knockout and is secured by the integral clamp. The Thomas & Betts 2IH3-1 Red-Dot is a 2-gang conduit outlet box with three 1/2-inch threaded hubs, which takes conduit directly into the hub instead of using knockouts and a cable clamp. Choose by wiring method: NM cable favors the 52151 BN, threaded conduit favors the hubbed box.

It is sold each, so you can order the exact count a job calls for rather than a full carton. By contrast, something like the Thomas & Betts 2IH3-1 Red-Dot box is packaged 100 to a pack.

The Appleton GRT75 is a malleable iron round conduit outlet box, which suits openings and fittings that call for a round body. The Steel City 52151 BN is a 4 inch by 4 inch by 1-1/2 inch square steel box, so it matches square plaster rings, square covers, and 4-inch square mud rings rather than round trim.