Best 3 Gang Floor Box Options for Modern Floors and Quick Install
Finding the right 3 gang floor box can simplify wiring in commercial spaces, basements, or new builds where a clean, flush-install look matters. This article highlights five solid 3 gang floor box options, focusing on compatibility with concrete and masonry walls, durability, and ease of installation. Each product is evaluated for what matters most in a busy electrical setup: fit, protection, and flexibility.
A quick summary table helps compare core details at a glance. The table lists each option’s brand, product name, and standout feature to guide a quick decision.
| Product | Brand | Key Feature |
|---|---|---|
| FBHR3 | Leviton | Flush to floor with height adjustment for thicker slabs |
| E9763S | Thomas & Betts | Non-metallic, high-impact thermoplastic |
| FBBOX-GY | Leviton | 2-gang system with separate finished floor plate option |
| 6239NI | RACO | Recessed duplex with adjustable steel box |
| 975549-S-D | ENERLITES | Nickel-plated brass, 2-gang, flip-lid style |
Leviton Concrete Floor Box 3-Gang Shallow Rectangle
Leviton’s FBHR3 is designed to sit flush with the finished floor after burial and curing. It includes leveling screws and a gasket to seal the installation, helping maintain a clean surface after tile rings and plates are added. A key benefit for retrofit projects is the height-adjust feature, which accommodates thicker concrete slabs without sacrificing cover alignment. This box supports a tidy, professional result with straightforward installation steps.
Carlon Thomas & Betts E9763S Tripe Gang Cover ASSY. 3-Gang Floor Box
The E9763S Tripe Gang Cover assembly from Thomas & Betts emphasizes non-metallic construction. Built from high-impact thermoplastic, it reduces weight while maintaining durability in a busy floor install. The slate color finish blends well with contemporary spaces, and the non-metallic design can help minimize corrosion concerns in damp environments. This option suits projects prioritizing lightweight, resilient housings with simple maintenance.
3-Gang Masonry Electrical Box (Airmont)
This 3-gang masonry box, made by Airmont Products, offers a robust welded design with a large 47.8 cubic inch interior. Dimensions (2.5″ depth, 3.75″ width, 5.59″ height) fit standard 4″ block walls, and the pre-galvanized steel provides corrosion resistance. For masonry walls, this box supplies ample internal volume for wiring connections and devices, with reliable support during concrete application and subsequent finishing work.
Leviton 2-Gang Concrete Floor Box System (FBBOX-GY)
While primarily marketed as a 2-gang system, the FBBOX-GY option from Leviton complements the 3-gang framework by offering a compatible finish plate and modular approach for larger floor box assemblies. It’s essential to purchase the corresponding FBLEV-GY and a Leviton finished floor plate for full compatibility. This setup supports a versatile floor box strategy where a 2-gang core can be extended into a larger configuration as needed.
RACO 6239NI Floor Kit with Recessed Duplex
The RACO 6239NI floor kit features a recessed duplex 15A TR device with an adjustable steel box. This nickel-finished unit minimizes surface protrusion, keeping the floor’s appearance clean while protecting the receptacle from incidental contact. It supports a versatile approach to power and data distribution with back and side knockouts, ensuring ready access to wiring while maintaining safety and tamper resistance. It is designed for fast installation with a pre-assembled flange and cover, simplifying field work.
ENERLITES 975549-S-D Nickel Plated Brass Floor Box
Enerlites’ 975549-S-D is a nickel-plated brass, 2-gang floor box with a flip-open lid design. It accommodates 20A tamper-resistant TR/WR duplex receptacles and Datacom ports, providing a ready-to-use solution for data and power in one footprint. With 14 knockouts across the sides and bottom, this option is designed for raised floors or subfloor installations, offering a flush mount that minimizes trip hazards and keeps the surface clean after installation.
Buying Guide
Key purchase considerations for 3 gang floor boxes include compatibility with concrete or masonry walls, and the mounting depth required for your space. Check whether the box is rated for flush installation and whether it includes gasket seals or height-adjustment hardware to cope with uneven slabs. Materials matter: metal boxes offer rugged durability, while thermoplastic variants can be lighter and resistant to corrosion in damp environments.
Knockouts and conduit options influence future wiring flexibility. Look for back and side knockouts suitable for data, USB, ethernet, or power runs, and verify if reducers or adapters are included or sold separately. If you plan a tile or finished-floor integration, ensure the tile ring, cover, and plate options align with the box you select to achieve a seamless surface.
Consider the floor’s substructure: raised floors require different depths and mounting methods than poured concrete slabs. Some models, like the Leviton and Enerlites options, emphasize flush finishes and height adjustment—benefits when slab thickness varies. Others, like RACO or Thomas & Betts designs, spotlight modularity and ready-to-install covers that reduce field labor.
Price is a factor, but durability and install time often determine total cost of ownership. Choose corrosion-resistant finishes if the space is damp or prone to moisture exposure. Finally, confirm compatibility with your existing electrical devices and with any data or communication ports you intend to deploy, ensuring that the selected floor box accommodates both power and data needs in a single, organized package.