Steel City 52171 1 4SQR BX,STL,1/2,3/4,1 KO, 30.3CU

The 52171 is a 30.3 cubic inch box. Under the NEC box fill table, that allows 15 #14 AWG conductors (2.00 cu in each), 13 #12 (2.25 cu in each), or 12 #10 (2.50 cu in each) before you count deductions for devices, clamps and grounds. In practice that is a deep box with room for a multi-wire branch circuit plus a device yoke.

The 52171 has 13 knockouts in combination 1/2, 3/4 and 1 inch sizes, so you can land 1/2 inch, 3/4 inch or 1 inch EMT or rigid connectors without a reducing washer or a punch.

The Steel City 52171 1 is a 4 x 4 x 2-1/8 inch steel outlet box with 13 knockouts, built for dry interior work where the knockouts are closed off with connectors or plugs. For an exposed exterior device location, the Mulberry Royal Mountie weatherproof outlet box is a die-cast aluminum 1-gang box, and the Thomas & Betts 2IH3-1 Red-Dot is a 2-gang conduit outlet box with three 1/2 inch hubs - hubbed boxes thread directly to conduit rather than relying on knockouts.

The Steel City 52171 1 is a UL-listed steel 4-square outlet box for ordinary locations, not a classified-location enclosure. For hazardous areas the Appleton GRJ series is an explosionproof malleable iron conduit outlet box, the GRJS series is a universal explosionproof malleable iron body, and the GRT75 is a malleable iron round conduit outlet box. Those use threaded conduit entries rather than knockouts.

Yes. It carries UL file E2969.

Use the 52171 steel 4-square where you are running metal raceway and relying on the conduit system for equipment grounding, or where the box has to take mechanical abuse. For residential nonmetallic cable work in wood framing, a PVC box like the Cantex EZ Series multi-gang residential box is the usual choice and needs no bonding to the box itself.

It is sold as the box only, one each. Plan on ordering the cover separately, whether that is a flat blank cover, a single or two gang raised device ring, or a plaster ring to match your wall depth.

A 4 inch square box takes two devices when you add a two-gang raised cover, and the 30.3 cubic inch volume gives you the fill room to do it. For a dedicated 120/240V range or dryer outlet, a purpose-built box like the Pass & Seymour P242RRD range and dryer box is the normal pick instead.

Yes. The Steel City 52171 1 is a steel box with 30.3 cubic inches of volume, used where a metal raceway or metal box is wanted. For non-metallic residential wiring, the Cantex EZ Box series is a PVC multi-gang residential outlet box. The two are not interchangeable where the metal box is relied on as part of the equipment grounding path.

The 52171 1 is a general-purpose 4 x 4 x 2-1/8 inch steel outlet box with 1/2, 3/4 and 1 inch knockouts, so it will accept the larger conduit or cable entry such a circuit needs, but it is not a purpose-built appliance box. The Pass and Seymour P242RRD is a thermoplastic range and dryer box made specifically for that application.