Lew Electric SH-1101-SMB Floor Box – Concrete Floor & Installation Guide

Lew Electric SH-1101-SMB Floor Box – Concrete Floor & Installation Guide

February 8, 2026 discoverhiddenusacom Business

The construction and electrical sectors are seeing a new offering designed for streamlined installation and adaptability: the Lew Electric SH-1101-SMB concrete floor box. This heavy-duty, stamped steel product is intended for use in new concrete flooring projects, offering a solution for integrating electrical access points directly into the floor.

Designed for Flexibility

The SH-1101-SMB is a one-gang electrical floor box specifically suited for concrete pours ranging from 2.5 to 3 inches. A key feature is its adjustability, providing 2 1/4″ of pre-pour adjustment and an additional 1/2″ of post-pour adjustment. This allows for precise leveling and alignment, even after the concrete has hardened, using only a screwdriver.

Ample Space and Conduit Options

The box offers 35 cubic inches of interior space, providing significant room for wiring and device installation. It also includes multiple conduit knockouts – 3/4″, 1″, and 1.25″ – to accommodate diverse wiring configurations. A protective concrete cap is included to maintain cleanliness during the pouring process.

Did You Know? The Lew Electric SH-1101-SMB is ETL listed, meaning it conforms to both UL Standard #514A and CSA Standard #C22.2 #18.

Installation Considerations

While the SH-1101-SMB is designed for broad compatibility, specific installation requirements exist depending on the flooring material. For carpeted floors, the optional CF-1100 Series carpet flange, sold separately, adds 3/8″ of height. Tile or flush installations require the separate 1101-DBE Series tile. Regardless of the flooring, a 1100 series cover is required to complete the installation.

Expert Insight: The adjustability features of this floor box suggest a focus on reducing installation time and potential rework, which can be significant cost drivers in construction projects. The need for separate components – carpet flange, tile, and cover – indicates a modular system designed to cater to a range of finishing options.

The product’s ETL listing indicates adherence to established safety standards for installations in both the United States and Canada.

Looking Ahead

Should construction projects continue to prioritize streamlined installation processes, products like the SH-1101-SMB could see increased adoption. A possible next step for Lew Electric could be expanding the range of compatible covers and flanges to offer even greater design flexibility. Analysts expect continued demand for robust and adaptable electrical solutions in both residential and commercial construction.

Frequently Asked Questions

What concrete pour depth is the SH-1101-SMB designed for?

The SH-1101-SMB is designed for a 2.5″ to 3″ concrete pour.

What conduit knockout sizes are included with the box?

The box includes 3/4″, 1″, and 1.25″ conduit knockouts.

Are additional components required for a complete installation?

Yes, one 1100 series cover is required. Depending on the flooring, the optional CF-1100 Series carpet flange or the 1101-DBE Series tile may also be necessary.

How might innovations in concrete flooring technology influence the demand for adaptable electrical floor boxes?