Middle Atlantic CI SHL FLR BX SGL SRV - 887B

Middle Atlantic 887B Shallow Cast Iron Single-Service Concrete Floor Box

Overview

The Middle Atlantic 887B is a single-service shallow cast iron floor box engineered for concrete slab installations where you need a durable, low-profile service point for power, data, or AV connections. Part of the Middle Atlantic floor box and infrastructure line, the 887B is TAA-compliant — a hard requirement on any federal, government, or publicly funded project. At 4.8 in × 4.8 in × 2.63 in, this box is purpose-built for shallow concrete pours where a standard-depth unit simply won't fit.

If you're laying infrastructure in a new commercial build, a conference room renovation, or a warehouse floor where cable management needs to surface cleanly without wall runs, a properly specified concrete floor box like the 887B is the right tool. The shallow form factor solves a real coordination problem on job sites: slab depth is often constrained by structural requirements, HVAC, or existing rebar grids, and a deep box forces costly rework. This unit eliminates that conflict.

Key Features

• Shallow 2.63 in (6.7 cm) Installed Depth: At under three inches deep, the 887B drops into concrete pours where a standard floor box would hit rebar or exceed slab depth allowances. This is the spec to check first against your structural drawings — if your slab is 3.5 in or less, you need a shallow unit and this one fits.
• Cast Iron Construction: Cast iron withstands the compressive and impact loads of a working floor — foot traffic, rolling carts, pallet jacks in light-duty applications. A plastic or thin-gauge steel box in a concrete application risks cracking or deforming under load, which compromises the service cover seal and creates a trip hazard. Cast iron holds its shape over the life of the slab.
• 4.8 in × 4.8 in (12.2 cm × 12.2 cm) Footprint: The square footprint keeps the cutout compact and symmetric, which simplifies core drilling templates and finish trim alignment. Larger footprints increase the concrete patch area if you ever need to relocate — the 887B minimizes that risk.
• Single-Service Configuration: Designed to serve one service point — power, data, or AV — rather than a multi-gang layout. This keeps the box shallow and the cover profile flush. If your location requires two or more independent services at the same floor point, plan for a multi-service variant or adjacent boxes rather than trying to crowbar multiple feeds into a single-service housing.
• TAA Compliant: The 887B meets Trade Agreements Act requirements, which means it qualifies for federal procurement, GSA schedules, and any contract vehicle that restricts purchases to TAA-designated countries of origin. Specify this part number on government or publicly funded builds without a compliance question mark hanging over the submittal.

Integration & Compatibility

The 887B is a structural rough-in component — compatibility is determined by the service inserts, cover plates, and trim rings you select for the finished installation rather than by software or protocol. Verify that any service insert (receptacle, keystone, or AV plate) is dimensioned for this box's interior opening before ordering finish hardware. As part of the Middle Atlantic 880 Series, cover and trim accessories designed for this series will seat correctly; mixing components from other series or manufacturers requires dimensional verification.

For projects combining floor-box infrastructure with overhead or wall-mounted AV and security systems, coordinate conduit entry points during rough-in — the 887B's shallow depth limits the conduit bend radius available below the box. Plan conduit runs accordingly before the pour. Integrators specifying this unit alongside structured cabling and AV infrastructure should confirm slab depth with the GC before submittal to avoid field substitutions.

Frequently Asked Questions

Q: Is the Middle Atlantic 887B TAA compliant?

A: Yes. The 887B is TAA compliant, making it suitable for federal, GSA, and government-funded projects that require Trade Agreements Act compliance.

Q: What is the installed depth of the 887B?

A: The 887B has an installed depth of 2.63 inches (6.7 cm), making it a shallow-depth unit designed for concrete slabs where standard-depth floor boxes cannot be used.

Q: What are the overall dimensions of the 887B?

A: The 887B measures 4.8 in × 4.8 in × 2.63 in (12.2 cm × 12.2 cm × 6.7 cm) — width × depth × height.

Q: How many services does the 887B support?

A: The 887B is a single-service floor box. It is designed to accommodate one service point (power, data, or AV). Multi-service applications require a different model or multiple adjacent boxes.

Q: Is the 887B suitable for use in poured concrete slabs?

A: Yes. The 887B is a cast iron concrete floor box engineered for installation in poured concrete. Its shallow 2.63 in depth addresses applications where slab thickness or structural constraints prevent use of a standard-depth box.

Ted Perry

The spec that drives every decision on the 887B is that 2.63 in installed depth. On most commercial concrete pours, especially post-tension slabs where you can't core freely, that number is the difference between a clean install and a change order. I've seen integrators quote a standard 4-inch box, hit rebar at 3 inches, and spend more on the fix than the entire floor box budget. The 887B solves that before it starts.

Technical Highlights:

• 2.63 in Shallow Depth: Fits in constrained concrete pours — check your structural slab section before spec'ing any floor box; if pour depth is under 3.5 in, shallow is your only option.
• Cast Iron Body: Handles compressive floor loads without deforming — critical for maintaining a flush, trip-hazard-free cover in high-traffic areas.
• TAA Compliance: The 887B qualifies for federal and GSA procurement without additional documentation burden — one less compliance checkbox on government submittals.

Deployment Considerations:

• Coordinate conduit entry angle during rough-in: the shallow 2.63 in box depth restricts the available conduit bend below the box — plan your conduit run before the pour, not after.
• Single-service only: if the location will need power AND data at the same floor point, specify two adjacent 887B units or a multi-service model rather than attempting to force two services into this housing.

The 887B is the right call on TAA-required government facility builds and any commercial project with shallow slab constraints — conference centers, renovated office floors, and education facilities where slab depth is fixed and compliance documentation is non-negotiable.