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Centaur 1-gang old work plastic switch boxes are designed for retrofit applications in existing walls. Constructed from durable, non-conductive plastic, these boxes offer safe and secure mounting for switches and outlets. Available in 14 and 20 cubic inch capacities, they provide flexibility for various wiring needs. Integrated mounting ears and wing clamps ensure a fast and stable installation in drywall or other wallboard surfaces.
| Variant SKU | Depth (Length) | Width | Height | Cubic Capacity |
|---|---|---|---|---|
| PSB114‑OW | 2.13″ | 2.25″ | 3.13″ | 14 in³ |
| PSB120‑OW | 4.125″ | 2.40″ | 3.85″ | 20 in³ |
PSB114-OW
Product Specs
- Box Type:
- Plastic Old Work Switch Box
- Gang Options:
- 1-Gang
- Product Type:
- Switch Box
- Application:
- Installing electrical devices in existing walls
- Cubic Capacity:
- 14 / 20 cu in
- Mounting Feature:
- Old Work
- Product Group:
- Electrical Boxes
- Product Subgroup:
- Junction Boxes
- Product Material:
- Plastic
- Department:
- Electrical
Centaur PSB114-OW-1 – Frequently Asked Questions
1) Can Centaur old work switch boxes be installed in a finished wall without opening up the drywall?
That's exactly what they're built for. The Centaur PSB-OW boxes are old work (retrofit) boxes: you cut an opening in the existing drywall, slide the box in, and the integrated mounting ears and wing clamps draw down against the back of the wallboard to hold it. No stud attachment and no wall demolition needed.
2) Should I use the 14 cu in or the 20 cu in Centaur 1-gang box?
It comes down to conductor count. The 14 cubic inch box (PSB114-OW) is the shallower one at 2.13 inches deep, which suits a simple single switch or receptacle on one cable run. The 20 cubic inch box (PSB120-OW) is 4.125 inches deep and gives you the extra fill volume for multiple cables, pigtails, grounds, or a bulkier device such as a dimmer or smart switch. Box fill is calculated per the NEC based on conductors, devices, and clamps, so count the wires before you choose.
3) How deep a wall cavity do I need for the Centaur 20 cu in old work box?
The 20 cubic inch PSB120-OW measures 4.125 inches deep by 2.40 wide by 3.85 high, so the cavity behind the drywall has to clear just over 4 inches. Standard 2x4 stud framing gives about 3-1/2 inches of cavity, so in a 2x4 wall the shallower 14 cubic inch PSB114-OW at 2.13 inches deep is the one that fits. Save the 20 cubic inch box for 2x6 walls or other deep cavities.
4) Are these plastic boxes OK for metal-clad or armored cable?
No. The Centaur PSB-OW boxes are non-conductive plastic, so there is no way to bond the box and no clamp intended for MC or AC armor. Use them with nonmetallic-sheathed cable. For MC, AC, or conduit runs you want a metal old work box that can be bonded.
5) How many Centaur old work switch boxes come in a case?
They ship 50 boxes to a case, ordered by cubic capacity: 1-gang/14 cu in or 1-gang/20 cu in. That case quantity suits a property manager doing a device changeout across units or a contractor rough-in punch list rather than a one-off repair.
6) Can I use an old work box in new construction framing?
Not the right tool. Old work boxes like the Centaur PSB-OW clamp to the face of installed wallboard, so they need finished drywall to grip. When the studs are still open, use a new work box that nails or screws to the stud instead.
7) Will a standard switch or receptacle plate cover the Centaur 1-gang old work box?
Yes. These are 1-gang boxes with the usual device mounting, so any standard or decorator 1-gang wall plate covers the opening once the device is screwed in. One box takes one switch or one receptacle.
How fast can I get the Centaur PSB114-OW-1 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
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 Centaur PSB114-OW-1 come with a warranty?
Absolutely. The Centaur PSB114-OW-1 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Centaur PSB114-OW-1?
You can call, text, or email our expert support team for fast answers. We’re here to help with
product
selection,
installation tips, and troubleshooting. Contact Us
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