Southwire 52171-FS-UPC 4x4 Welded Steel Square Electrical Box

Product Description

The SOUTHWIRE 52171-FS-UPC is a bracket-mount, welded steel square electrical box designed to distribute power to multiple electrical devices at junction and outlet points. Measuring 4 inches x 4 inches, it accommodates runs where conductors must split into two or more directions. The box features combination knockouts for wiring flexibility and is designed to accept combination Phillips/Slotted screw heads. It is UL listed and RoHS compliant. Electricians and electrical contractors install this box in residential and commercial wiring applications as a code-compliant junction or device enclosure.

This square box is suited for new construction and renovation work where a bracket-mount configuration is required. It is used in wall and ceiling installations to consolidate multiple conductor runs at a single point, making it a common choice in residential panel feeds, commercial branch circuits, and general electrical rough-in work. The 4-inch x 4-inch footprint accommodates standard covers, mud rings, and extension rings commonly used in the trade.

Key Features

• Welded steel construction provides a rigid, durable enclosure for conductor terminations
• Bracket-mount design for secure attachment during rough-in
• Combination knockouts allow flexible conduit or cable entry from multiple directions
• Compatible with combination Phillips/Slotted screw heads for faster installation
• UL listed and RoHS compliant for code-compliant installations

Compatibility

Designed as an OEM-style replacement and standard-fit square electrical box for use with 4-inch x 4-inch covers, mud rings, and extension rings in residential and commercial electrical installations.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize all circuits at the panel before beginning work. Secure the box firmly to structural framing using the bracket mount before pulling conductors. Do not overtighten knockouts or use the box beyond its rated 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: 1.002 pounds
• Certifications: UL Listed, RoHS Compliant
• Unit of Measure: Each

Standard Information

• Brand: SOUTHWIRE
• Manufacturer Part Number: 52171-FS-UPC