Hubbell-raco 203 Square Extension Ring 4 Inches Steel

Product Description

The HUBBELL-RACO 203 is a 4-inch square extension ring constructed from steel, designed to increase the interior volume of an existing 4-inch square electrical box. Extension rings are used when a standard-depth box does not provide adequate cubic-inch capacity for the number of conductors, devices, or splices required by NEC fill calculations. The steel construction provides durable, code-compliant performance in both new construction and retrofit applications. Licensed electricians and electrical contractors install this fitting as part of a compliant wiring enclosure assembly in residential and light commercial work.

This extension ring is suited for use in standard electrical rough-in applications where box fill capacity needs to be increased without replacing the existing flush-mounted or wall-mounted 4-inch square box. Typical scenarios include device box upgrades, splice point expansions, and situations where additional wiring volume is needed behind cover plates or raised device covers. It is appropriate for use in both exposed and concealed wiring installations where a 4-inch square box footprint is already established.

Key Features

• 4-inch square footprint matches standard 4-inch square electrical boxes
• Steel construction for durable, long-lasting performance in electrical enclosure assemblies
• Increases box interior volume to assist with NEC conductor fill compliance
• Compatible with standard 4-inch square box covers and raised device covers
• Sold individually, suitable for single-unit replacement or service calls

Compatibility

Designed as an OEM-style replacement and standard accessory for use with 4-inch square electrical boxes requiring additional depth or conductor fill capacity.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local amendments. De-energize the circuit and verify absence of voltage before opening any electrical enclosure. Secure the extension ring firmly to the existing box before pulling or terminating conductors. Verify total box fill calculations per NEC Article 314 after adding the extension ring to ensure compliance.