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These plastic old work switch boxes are ideal for retrofit installations in existing walls. Designed for fast, secure mounting without the need for stud access, each box includes integral mounting tabs or clamps to ensure a reliable fit. Constructed from high-strength, non-conductive thermoplastic, they offer durability, corrosion resistance, and easy installation across a range of gang configurations and cubic capacities.
| Variant SKU | Depth (Length) | Width | Height | Cubic Capacity |
|---|---|---|---|---|
| PSB225‑OW | 3.9375″ | 4.00″ | 3.125″ | 25 in³ |
| PSB117AP‑OW | 3.64″ | 4.00″ | 3.625″ | 17 in³ |
Manufacturer Resources
PSB225-OW
Product Specs
- Box Type:
- Plastic Old Work Switch Box
- Gang Options:
- 1-Gang / 2-Gang
- Product Type:
- Switch Box
- Special Features:
- Access Panel (on PSB117AP-OW)
- Application:
- Installing electrical devices in existing walls
- Cubic Capacity:
- 17 / 25 cu in
- Mounting Feature:
- Old Work
- Product Group:
- Electrical Boxes
- Product Subgroup:
- Junction Boxes
- Product Material:
- Plastic
- Department:
- Electrical
Centaur PSB225-OW – Frequently Asked Questions
1) Can these Centaur old work switch boxes be installed in an existing drywall wall without opening it up to reach a stud?
That is exactly what they are built for. The Centaur plastic old work switch boxes mount into a cut-out in finished drywall using integral mounting tabs or clamps, so no stud access is needed. Both the 1-gang and 2-gang versions are old work style.
2) How many conductors will a 17 or 25 cubic inch old work switch box hold?
Box fill is set by cubic capacity. The 1-gang Centaur box is 17 cu in and the 2-gang is 25 cu in. Under NEC box fill math, 14 AWG counts 2.0 cu in per conductor and 12 AWG counts 2.25, with additional allowances for the device (two conductors' worth) and for grounds and clamps. That puts the 17 cu in box at roughly eight 14 AWG or seven 12 AWG conductor equivalents, and the 25 cu in box at about twelve 14 AWG. Count your equivalents before you cut the hole.
3) How deep a wall cavity do I need for these Centaur plastic old work boxes?
Check the box depth against your cavity before cutting. The 2-gang PSB225-OW runs 3.9375 x 4.00 x 3.125 inches and the 1-gang PSB117AP-OW runs 3.64 x 4.00 x 3.625 inches. In a standard 2x4 stud wall you have about 3-1/2 inches of cavity, so confirm the deepest dimension clears any insulation, blocking, or plumbing behind the drywall.
4) Are Centaur plastic switch boxes okay to use where metal boxes would corrode, and do I need to run a ground to the box?
The boxes are molded from high-strength non-conductive thermoplastic, so they resist corrosion and will not carry current the way a steel box does. Because the enclosure is non-conductive, there is nothing on the box itself to bond; the equipment ground goes to the device and to any downstream grounds inside the box.
5) Can I use an old work box like this for a new construction rough-in?
You can, but it is the wrong tool for it. Old work boxes clamp to the drywall face, so they need finished wallboard to grip. For a rough-in with open studs, use a new work box that nails or brackets directly to the stud. Reserve the Centaur old work boxes for adding or relocating devices in walls that are already closed up.
6) Do these Centaur boxes come in bulk for a multi-unit retrofit?
They ship 30 boxes to a pack, which suits a property manager or electrical contractor doing device swaps across a floor or a building. Pick the gang count per opening: 1-gang at 17 cu in or 2-gang at 25 cu in.
7) What does the access panel on the PSB117AP-OW do?
The access panel is a feature specific to the PSB117AP-OW, the 1-gang 17 cu in box. If you need that opening for cable access or service, order the AP version; the 2-gang PSB225-OW is a plain old work box without it.
How fast can I get the Centaur PSB225-OW 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 PSB225-OW come with a warranty?
Absolutely. The Centaur PSB225-OW 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 PSB225-OW?
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