Steel City 68 D 1-Gang Flush Floor Box, 60 in³ Stamped Steel

The 68 D is a 60 cubic inch 1-gang floor box, which is a large volume for a single-gang device. Under the NEC box fill rules, each 12 AWG conductor counts 2.25 cubic inches and each 14 AWG counts 2.0, so 60 cubic inches gives plenty of room for a receptacle plus feed-through wiring. Count the device as two conductors of the largest size in the box when you do the math for your own install.

It is a stamped steel flush service floor box with 12 knockouts, intended to be set in the floor so the service fitting finishes flush with the finished surface. The steel body and the large knockout count suit it to concrete pour and raised-floor work where conduit comes in from multiple directions. For a non-metallic pour box instead, the Pass & Seymour TM1542 Series floor box is PVC.

Depth is the dividing line. The 68 D is a 60 cubic inch steel single-gang box, a deep body with room for conduit and feed-through wire. The Wiremold 880M1 OmniBox and the 885B are shallow single-service steel boxes, which is what you reach for when slab or subfloor depth is tight. The Wiremold 880W1 is a 1-gang steel box at 53 cubic inches, closer in capacity to the 68 D.

The Wiremold 880W1 is a steel 1-gang floor box rated at 53 cubic inches, compared with the 60 cubic inches of the stamped steel Steel City 68 D. Both are single-gang steel boxes, so conduit routing and wiring practice are similar; the 68 D gives you about 7 additional cubic inches of fill capacity, which matters if you are counting conductors and devices against box fill rules.

Twelve knockouts, which is what lets you bring conduit in from more than one side or stub through to an adjacent box without reworking the rough-in. You only open the ones you use; the rest stay closed.

The 68 D is sold as the box only, each. Flush service floor boxes are specified with the cover plate, carpet flange, or receptacle service fitting ordered separately, so you need to pick that trim to suit your finished floor and the device you are installing.

The Pass and Seymour TM1542 series floor box is a PVC-bodied floor box, while the Steel City 68 D is stamped steel. PVC bodies are used in concrete pours where a non-metallic box is preferred and no bonding path through the box body is needed; a steel box like the 68 D is metallic and carries 12 knockouts for conduit entries. The material choice drives your grounding and conduit transition details, so match it to the raceway system already specified on the job.

The steel single-gang field includes the Steel City 68 D, a 60 cubic inch stamped steel flush service box carrying UL E2969, plus the Wiremold 880W1 at 53 cubic inches, the Wiremold 880M1 OmniBox shallow box, and the Wiremold 885B shallow single service box. Standardizing usually comes down to slab depth and cover family: the 68 D and 880W1 are the fuller-volume bodies, while the 880M1 and 885B are the shallow options for thin pours.

Not necessarily. The 885B is a shallow steel single service floor box in the 880 Series, and the Steel City 68 D is a flush service floor box with 60 cubic inches of volume in stamped steel. They are both single-service steel boxes, but the shallow body and the 880 Series cover and carpet-flange ecosystem are not the same as Steel City 68-series trim. If you are replacing an existing 68 D, verify that the cover and ring you intend to reuse fit the 885B body before ordering.

The box itself is one part number, 68 D, so the rough-in stays identical from room to room. What changes across carpet, tile, and exposed concrete is the service fitting and flange you put on top of it, not the box. Keeping one 60 cubic inch steel body underneath simplifies stocking for a property or facilities crew.