Raco 273-RAC Concrete Ring Electrical Box 3.5 in Deep

Product Description

The RACO 273-RAC is a pre-galvanized steel concrete ring designed to extend the depth of an electrical box in concrete or masonry installations. At 3.5 inches deep with a 43.0 cubic inch capacity, this welded ring provides the additional interior volume needed to meet NEC box-fill requirements when conductors, devices, or fittings are added to an existing rough-in box. A double row of 1/2-inch and 3/4-inch knockouts allows flexible conduit entry from multiple directions. Licensed electricians and electrical contractors install this ring during concrete form work or as an extension in retrofit applications.

This concrete ring suits residential and commercial electrical installations where boxes are set in poured concrete slabs, floors, or walls. It is used with standard gangable or concrete boxes to bring the box face flush with the finished concrete surface and to add cubic capacity. The double-row knockout pattern accommodates both 1/2-inch and 3/4-inch conduit, making it compatible with the most common EMT and rigid conduit sizes used in concrete-encased raceway systems.

Key Features

• Pre-galvanized steel construction with welded seams for durability in concrete environments
• 3.5-inch depth provides substantial box-fill capacity of 43.0 cubic inches
• Double-row knockouts accept 1/2-inch and 3/4-inch conduit entries
• Silver finish pre-galvanized steel resists corrosion during and after concrete pour
• UL listed for code-compliant installations
• Mounting style designed specifically for concrete form and slab applications

Compatibility

Designed as an OEM-style extension ring for use with concrete electrical boxes in poured concrete slab and wall installations requiring 1/2-inch and 3/4-inch conduit knockouts.

Installation Notes

Installation is performed by a licensed electrician in accordance with the National Electrical Code (NEC). De-energize all circuits in the work area before handling any box assembly or pulling conductors. Ensure the ring is secured and properly positioned within the concrete form before the pour so the face finishes flush with the slab surface. Verify that total conductor and device fill does not exceed the 43.0 cubic inch rated capacity as required by NEC box-fill calculation rules.