Southwire 53151-SUB-UPC Square Extension Ring 4x4 in

Product Description

The SOUTHWIRE 53151-SUB-UPC is a welded 4-inch by 4-inch square extension ring designed to increase the wiring capacity of existing junction boxes without requiring full box replacement. Electricians add this ring directly to a standard 4-inch square box to gain additional cubic-inch volume for conductors and devices. The welded construction provides a rigid, code-ready fit. The ring is UL Listed and RoHS compliant, making it suitable for use in residential and commercial electrical installations governed by NEC requirements. At 0.624 pounds, it is lightweight and easy to handle in wall, ceiling, and floor box applications.

This extension ring is used when an existing junction box lacks sufficient wiring capacity for added circuits, splices, or device installations. Common scenarios include service upgrades, circuit additions, and renovation work where existing conduit and wiring must remain undisturbed. The ring opens access for additional conduit runs and electrical conductors without requiring the installer to demo and replace the existing box. It is appropriate for both surface-mounted and flush-mounted square box installations in residential, light commercial, and industrial settings.

Key Features

• Welded construction for rigid, durable fit on standard 4-inch square junction boxes
• Increases wiring capacity without removing existing conduit boxes or circuits
• Provides access for additional conduit runs and electrical conductors
• UL Listed for compliance with NEC installation requirements
• RoHS compliant construction
• Lightweight at 0.624 pounds for easy single-hand placement

Compatibility

Designed as an OEM-style replacement and add-on extension ring for standard 4-inch by 4-inch square electrical junction boxes used in residential and commercial wiring 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 the circuit and verify absence of voltage before opening any junction box or adding this extension ring. Secure the ring to the existing box using appropriate fasteners and verify all conductors remain within the allowable box fill calculation per NEC Article 314 before closing the assembly.

Technical Specifications

• Size: 4 inches x 4 inches
• Construction: Welded
• Weight: 0.624 pounds
• Certifications: UL Listed, RoHS Compliant
• Unit of Measure: Each

Standard Information

• Brand: SOUTHWIRE
• Manufacturer Part Number: 53151-SUB-UPC