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RACO 130 Drawn Steel Octagon Extension Ring, 4 in. x 1-1/2 in. Deep
The RACO 130 Octagon Extension Ring extends the depth of an existing 4 in. octagon box, giving electricians extra wiring space without replacing the original box. Formed from drawn steel, this extension ring measures 4 in. in diameter and 1-1/2 in. deep, and it is fitted with two 1/2 in. and two 3/4 in. knockouts (KO's) for flexible conduit entry. The ring carries no mounting bracket, making it a direct add-on to an installed box, and it is cULus Listed for use in conduit wiring systems.
Key Features
- Trade Size: 4 in. octagon extension ring provides additional depth for existing box installations.
- Depth: 1-1/2 in. deep design adds usable interior volume without a full box replacement.
- Durable Construction: Drawn steel body offers a rigid, one-piece extension ring built for demanding electrical work.
- Knockouts: Two 1/2 in. and two 3/4 in. KO's accommodate multiple conduit sizes entering the box.
- Bracket Type: No Bracket design mounts directly to the existing octagon box for a clean, low-profile extension.
- Wiring System: Engineered for conduit wiring systems in commercial and residential electrical work.
Certifications & Compliance
- cULus Listed
Technical Specifications
- Product Type: Steel Boxes and Covers
- Product Size: 4 in
- Product Depth: 1.5 in
- Drawn or Welded: Drawn
- Bracket Type: No Bracket
- Wiring System: Conduit
- Knockouts: 1/2 in;3/4 in
- Certified Listed: cULus Listed
Typical Applications
- Extending Existing 4 in. Octagon Boxes
- Ceiling and Wall Electrical Box Retrofits
- Conduit and Raceway Wiring Systems
- Commercial and Residential Electrical Installations
- Junction and Outlet Box Depth Additions
Why RACO?
RACO builds this 130 extension ring from drawn steel for a durable, one-piece construction that stands up to demanding job-site conditions. With its cULus Listed rating and precise 4 in. by 1-1/2 in. deep dimensions featuring two 1/2 in. and two 3/4 in. knockouts, it delivers a reliable, code-compliant way to add wiring capacity to existing octagon box installations without a full box replacement.
Manufacturer Resources
Spec Sheet
Product Specs
- list_batch:
- RACO-20260916
- Product Type:
- Box Extension Ring
- Product Size:
- 4 in
- Product Depth:
- 1.5 in
- Drawn or Welded:
- Drawn
- Bracket Type:
- No Bracket
- Wiring System:
- Conduit
- Knockouts:
- 1/2 in;3/4 in
- Certified Listed:
- cULus Listed
- Department:
- Electrical
- Product Subgroup:
- Electrical Boxes
- Product Group:
- Boxes & Enclosures
RACO RACO130 – Frequently Asked Questions
1) Will the RACO 130 extension ring fit a standard 4 inch octagon box?
Yes. The RACO 130 is a 4 inch octagon extension ring, so it lands on the ears of an installed 4 inch octagon box and adds 1-1/2 inches of depth. It is not a box itself and has no mounting bracket, so it depends on the existing box staying in place.
2) I'm over box fill on a ceiling junction box. Can I add depth instead of replacing the box?
That is exactly what the RACO 130 does. It extends an existing 4 inch octagon box by 1-1/2 inches of added interior volume so you gain wiring space without pulling and re-mounting the original box. Useful on ceiling fixture and junction box retrofits where the box is secured to framing you would rather not disturb.
3) Can I use the RACO 130 to deepen a square 4 inch box or a single-gang switch box?
No. The 130 is an octagon pattern sized to a 4 inch octagon box, so the knockout and screw pattern will not line up on a 4 inch square box or a device box. For a single-gang switch box, an extension built for that pattern is what you want, such as the Thomas and Betts SBEX Steel City adjustable 1-gang switch box extension.
4) What extension ring should I use if the box I need to deepen is a 1-gang switch box and not a 4 in. octagon?
The RACO 130 is a 4 in. octagon extension ring, so it will only land on a 4 in. octagon box footprint. For a single-gang rectangular switch box, use the Steel City SBEX adjustable 1-gang switch box extension instead, which is built in pre-galvanized steel and rated at 3.5 cu. in. of added volume. The shapes are not interchangeable - a 4 in. octagon ring cannot be mounted to a 1-gang switch box.
5) What conduit sizes can I bring into the RACO 130 extension ring?
The ring is punched with two 1/2 inch and two 3/4 inch knockouts, so you can land either trade size of conduit or a connector in that range directly into the extension rather than the original box.
6) Is the RACO 130 octagon extension ring UL listed for commercial work?
It is cULus Listed, which covers both US and Canadian requirements, and it is intended for conduit wiring systems. That listing is typically what an inspector or institutional spec is looking for on steel boxes and extensions.
7) Does the RACO 130 come with mounting screws or a bracket to fasten it to framing?
No bracket. The 130 is a bracketless extension that mounts to the face of the box already installed, so it is not fastened to studs or joists on its own. Plan on using the existing box as the anchor point and a cover or fixture to close out the front.
8) Is the Steel City SBEX a substitute for a RACO 130 octagon extension ring on a ceiling fixture box?
No. Ceiling fixture boxes are typically 4 in. octagons, and the RACO 130 is the matching 4 in. octagon extension ring, 1-1/2 in. deep, formed from drawn steel with two 1/2 in. and two 3/4 in. knockouts for conduit entry. The Steel City SBEX is a 1-gang switch box extension sized for a rectangular wall box, so it will not cover or fasten to an octagon ceiling box.
9) Is this extension ring drawn or welded steel, and does it matter?
Drawn. The 130 is formed as a one-piece drawn steel body rather than welded from pieces, so there are no seams at the corners to open up when it is handled or fastened on the job.
10) Where can I get the manufacturer spec sheet for the RACO 130?
RACO publishes a spec sheet for model 130 at hubbellcdn.com/specsheet/RACO-130-SPEC-EN.pdf. Order by manufacturer part number 130.
How fast can I get the RACO RACO130 delivered?
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Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the RACO RACO130 come with a warranty?
Absolutely. The RACO RACO130 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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