4″ x 2″ x 1-7/8″ Utility Box, 10 Knockouts, Steel, Rectangular

Raco 660 – 4″ x 2″ Utility Box, Drawn Steel, 1-7/8″ Deep, 10 Knockouts

The Raco 660 utility box is a 4″ x 2″ drawn steel box designed for use in branch circuit wiring for receptacles, switches, or other wiring devices. With a depth of 1-7/8″ and a volume of 13.0 cubic inches, this unit is intended for wall or ceiling installations in commercial and residential applications where space is limited and conduit termination is required.

The box includes ten 1/2″ knockouts positioned for field flexibility and features a raised ground screw for uninterrupted surface mounting. Manufactured from pre-galvanized steel, it provides structural integrity and corrosion resistance suitable for use in dry, non-plenum areas.

Application Features

• ✅ Drawn Steel Construction – One-piece seamless design for added strength and reduced installation time.
• ✅ 1-7/8″ Depth – Supports shallow wall assemblies while meeting code-required fill volumes for small conductor counts.
• ✅ 10 Concentric Knockouts – Pre-formed 1/2″ entries on sides and back for EMT or flex conduit terminations.
• ✅ Raised Ground Screw Area – Facilitates surface mount without interference from bonding hardware.
• ✅ UL Listed – Certified for electrical enclosure use per NEC and UL requirements.

Technical Specifications

• Catalog Number: 660
• Material: Pre-Galvanized Steel
• Box Dimensions: 4″ x 2″
• Depth: 1-7/8″
• Volume: 13.0 cu. in.
• Knockouts: 10 total – 1/2″ size (sides and back)
• Ground Screw: Raised, tapped 10-32
• Certifications: UL Listed, File E195978

Installation Considerations

Raco 660 boxes are suitable for use with non-combustible framing in applications where shallow wall cavities limit box depth. The knockout layout accommodates flexible conduit routing in both new construction and renovation environments. This model is compatible with standard plaster rings, device covers, and wall plates for 4″ square box applications.

Common Use Cases

Ideal for utility rooms, device enclosures, shallow junction boxes, or back-to-back device applications where space constraints require minimal projection. Frequently used in conjunction with 1900 box covers in exposed or concealed installations.

Installation Advantages

• ✅ Space-Conserving Footprint – 1-7/8″ depth fits shallow studs and furred walls.
• ✅ Raised Bonding Location – Allows uninterrupted flush mounting to walls or struts.
• ✅ Multiple Conduit Entry Points – Reduces the need for field drilling or punch-outs.
• ✅ Compatible with Standard Accessories – Integrates with 4″ square box covers, mud rings, and extension rings.