Southwire 55151-1/2-UPC Octagon Box Extension Ring

Product Description

The SOUTHWIRE 55151-1/2-UPC is a 4-inch by 4-inch octagon box extension ring with a 1.5-inch depth, designed to increase the wiring capacity of existing octagon junction boxes. Electricians use this extension ring when a standard box lacks sufficient volume for additional conductors or splice connections. Rather than removing existing conduit boxes and wiring from a circuit, the ring mounts directly to the original box to expand cubic-inch capacity and provide access points for additional conduit runs. The ring is UL listed and RoHS compliant, making it suitable for use in both residential and light commercial wiring installations.

This extension ring is used in electrical rough-in and retrofit applications where existing octagon boxes have reached their fill capacity under NEC volume requirements. It is commonly installed in ceiling and wall junction box locations where additional circuit wiring must be added without disturbing existing conduit or wire terminations. Licensed electricians performing service upgrades or circuit additions will find this ring a straightforward solution for expanding box fill without a full box replacement.

Key Features

• Increases wiring capacity of existing 4-inch octagon junction boxes
• Provides access for additional conduit runs or electrical conductors
• Eliminates the need to remove existing conduit boxes and wiring
• UL listed for safety compliance
• RoHS compliant construction

Compatibility

Designed as an OEM-style replacement and add-on extension for standard 4-inch by 4-inch octagon electrical junction boxes used in residential and light commercial installations.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC). De-energize the circuit at the breaker and verify absence of voltage before opening any junction box. The extension ring mounts to the face of the existing octagon box using the box's existing mounting holes. Verify total conductor fill volume after installation to ensure compliance with NEC box fill calculation requirements.

Technical Specifications

• Length: 4 inches
• Width: 4 inches
• Depth: 1.5 inches
• Weight: 0.15 pounds
• Certifications: UL Listed, RoHS Compliant
• Sold As: Each

Standard Information

• Brand: SOUTHWIRE
• Manufacturer Part Number: 55151-1/2-UPC