Southwire 52151-B-UPC 4x4 Square Bracket Mount Electrical Box

Product Description

The SOUTHWIRE 52151-B-UPC is a B bracket mount square electrical box designed to distribute power to multiple electrical devices in a single location. Measuring 4 inches x 4 inches, it serves as a junction point where conductor runs split into two or more directions. The box features combination knockouts for wiring flexibility and Phillips-slotted screw head compatibility, making it a standard choice for commercial and residential rough-in electrical work. It carries UL listing and RoHS compliance, meeting widely accepted safety and environmental standards. Licensed electricians install this box during rough-in framing stages or retrofit applications where a bracketed wall or ceiling box is required.

This square box is suited for residential and light commercial electrical installations where multiple circuits or conductor runs converge at a single point. The bracket mount design allows for secure attachment to framing members without requiring a direct stud face. The off-center knockout configuration supports flexible conduit or cable entry angles, which is useful in tight framing bays or where conductors approach from non-standard directions.

Key Features

• B bracket mount design for attachment independent of stud face
• 4 inch x 4 inch square profile for multi-circuit or multi-device applications
• Combination off-center knockouts for flexible conduit and cable entry
• Phillips-slotted screw head compatibility for common screwdrivers and bits
• UL listed and RoHS compliant

Compatibility

Designed as an OEM-style replacement or new-install square electrical box suitable for standard 4 inch x 4 inch rough-in applications in residential and light commercial wiring systems.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize the circuit at the breaker panel and verify with a non-contact voltage tester before beginning work. The bracket mount frame should be secured firmly to framing or structural members before pulling conductors. Do not exceed the box fill capacity as calculated per NEC Article 314.

Technical Specifications

• Box Size: 4 inches x 4 inches
• Mount Type: B Bracket Mount
• Knockout Style: Combination Off-Center
• Screw Compatibility: Phillips-Slotted
• Weight: 1.875 pounds
• Certifications: UL Listed, RoHS Compliant

Standard Information

• Brand: SOUTHWIRE
• Manufacturer Part Number: 52151-B-UPC