Southwire 52151-FS-UPC Steel Square Electrical Box 4x4

Product Description

The SOUTHWIRE 52151-FS-UPC is a bracket-mount, welded steel square electrical box designed to distribute power to multiple electrical devices at junction and outlet points. Built for installations where conductors split into two or more directions, this 4-inch by 4-inch box provides the interior volume and knockout layout needed for multi-conductor runs. Combination knockouts deliver wiring flexibility without requiring separate adapters. The box is compatible with combination Phillips/Slotted screw heads, keeping fastener selection simple on the job. UL listed and RoHS compliant, it meets standard electrical code requirements for residential and commercial rough-in work.

This square box is suited for residential and light commercial electrical installations where junction, outlet, or device boxes are required. Electricians use it during rough-in phases when running branch circuits, splitting conductor runs at junction points, or mounting devices in finished wall and ceiling assemblies. The bracket-mount design supports secure attachment to framing members and structural supports in standard stud-framed construction.

Key Features

• Welded steel construction for durability in rough-in applications
• Combination knockouts allow multi-direction conductor routing without additional fittings
• Compatible with combination Phillips/Slotted screw heads for faster installation
• Bracket-mount design for secure attachment to framing
• UL listed and RoHS compliant

Compatibility

Designed as an OEM-style replacement and standard-fit option for residential and light commercial electrical rough-in installations requiring a 4-inch by 4-inch square junction or outlet box.

Installation Notes

Installation should be performed by a licensed electrician in accordance with NFPA 70 (National Electrical Code) requirements for box fill, support, and conductor management. Always de-energize the circuit at the panel and verify with a non-contact voltage tester before working inside any electrical box. Secure the bracket mount firmly to framing before pulling conductors to prevent box movement. Do not exceed the box fill capacity as calculated per NEC Article 314.

Technical Specifications

• Box Size: 4 inches x 4 inches
• Mount Type: Bracket Mount
• Material: Welded Steel
• Weight: 0.8 pounds
• Certifications: UL Listed, RoHS Compliant

Standard Information

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