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    On-Q/Legrand Enclosure Extender — Installation Instructions

    September 08, 2026 2 min read

    Installation instructions for the On-Q/Legrand Enclosure Extender structured wiring enclosure accessory.

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    Full text manual (for reference)

    Installation instructions for the On-Q/Legrand Enclosure Extender (P/N 364450-03 for 28" enclosures, P/N 364450-04 for 42" enclosures) — a structured wiring enclosure accessory that expands the depth of an On-Q Enclosure by 2 5/8".

    Introduction

    The Enclosure Extender provides extra space inside the On-Q Enclosure by expanding the depth of the enclosure. The extender mounts to the enclosure at trim-out. Ventilation slots on the top and bottom provide a chimney-effect cooling for powered modules.

    Side rails are designed to mount the On-Q Wire Manager (P/N 364482-01) for a more organized installation. The extender also allows use of the Hinged Expansion Plate (P/N 364595-01) when used with a Custom Enclosure — the extender allows the Custom Covers to mount left- or right-handed.

    Description

    The On-Q Enclosure Extender is a 4-piece, white powder-coated steel assembly consisting of two side rails, a top rail, a bottom rail, and an installation hardware kit. The extender is assembled using the screws provided.

    Installation

    The Enclosure Extender is installed after the enclosure has already been installed and the system is ready for trim-out (i.e. after drywall, for finished recess applications).

    1. Position the rails in rough position: side rails with end holes up; top/bottom rails with assembly holes up.
    2. Slide the top/bottom rail inside the side rails, aligning the assembly holes.
    3. Assemble the extender using the #6 thread-forming screws provided. Do NOT tighten yet.
    4. Screw the #10 thread-forming screws halfway into the top two corners of the enclosure.
    5. Hang the extender assembly over the two #10 screws on top of the enclosure corners using the keyhole slots. Screw the two remaining #10 screws through the bottom two keyhole slots on the extender and into the enclosure.
    6. Fasten the left side rail to the enclosure using #6 thread-forming screws in the door hinge mounting holes. Tighten these screws.
    7. Tighten the screws installed in steps 3 and 5.
    8. Mount the cover (supplied with the enclosure) or a Custom Cover to the extender using the enclosure hardware.

    Manufacturer: On-Q/Legrand, 301 Fulling Mill Road, Suite G, Middletown, PA 17057. Phone (800) 321-2343, Fax (717) 702-2546, www.onqlegrand.com. Document IS-0134 Rev. C.