Bramec 17382 Electrical Box Extension Ring 4 Inch Square

Product Description

The BRAMEC 17382 is a 4 inch square steel electrical box extension ring designed to increase the wiring capacity of an existing 4 inch square electrical box. Built from stamped steel, the ring adds 1.5 inches of depth to the box assembly and includes 1/2 inch knockouts for conduit entry. Electricians and HVAC service technicians install this ring when the original box does not provide enough cubic inch volume for the conductors and devices being housed. The stamped knockouts allow flexible conduit routing while the steel construction maintains structural integrity in the finished assembly.

This extension ring is suited for residential and light commercial applications where 4 inch square boxes are used in HVAC equipment connections, control circuit enclosures, and general service wiring. It is commonly installed when adding devices to an existing junction or outlet box, or when transitioning wiring during equipment replacement or upgrade work. Confirm knockout alignment and cover plate fitment against the existing box before installation.

Key Features

• Adds 1.5 inches of depth to existing 4 inch square electrical boxes
• Stamped steel construction for durability and structural support
• 1/2 inch knockouts for standard conduit entry and routing flexibility
• Compatible with standard 4 inch square box covers and devices
• Suited for HVAC control circuit, junction, and service wiring applications

Compatibility

Designed as an OEM-style replacement and add-on ring for standard 4 inch square electrical boxes used in residential and light commercial wiring applications.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize and verify the circuit is dead before opening any electrical enclosure or modifying the box assembly. Confirm that the extension ring aligns with the existing box knockout pattern and that the combined assembly will accept the intended cover plate before securing. Do not exceed the fill capacity of the box assembly as determined by NEC box fill calculations.

Technical Specifications

• Box Size: 4 inches square
• Depth: 1.5 inches
• Knockout Size: 0.5 inches
• Material: Steel

Standard Information

• Brand: BRAMEC
• Manufacturer Part Number: 17382