Thomas & Betts B120R 20 Cu In ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$73.10
$4.29
Thomas & Betts B120R 20 cubic inch PVC old work electrical outlet box with nail-in mounting wings, blue

Thomas & Betts B120R 20 Cu In PVC Old Work Outlet Box

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Model: B120R
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$73.10
$4.29
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Thomas & Betts B120R 20 Cu In PVC Old Work Outlet Box

The Thomas & Betts B120R is a 20 cubic inch PVC old work outlet box engineered for retrofit and renovation electrical installations. Designed to mount in existing walls without opening the stud cavity, it gives electricians a fast, code-compliant solution for adding outlets and switches in finished spaces. UL listed (E11461) and blue PVC construction for easy identification on the job.

Specifications

  • Model: B120R
  • Volume: 20 in³
  • Material: PVC
  • Color: Blue
  • Application: Old work (retrofit / existing walls)
  • Standards: UL E11461
  • Sold: Each

Typical Applications

  • Adding outlets or switches in finished residential and commercial walls
  • Renovation and remodel electrical upgrades
  • Retrofit installations where new-work boxes are not accessible
  • Office, retail, and multi-family renovation projects

Manufacturer Resources

Product Specs

Idea Granular Category Code Igcc :
4433 >> Outlet box
Product Group:
Electrical Boxes
Product Type:
Outlet Boxes
Selling Unit Of Measure:
each
Standards:
UL E11461
Volume:
20 in³
Department:
Electrical
Product Subgroup:
Electrical Boxes
Product Color:
Blue
Product Material:
PVC

Thomas & Betts B120R – Frequently Asked Questions

1) Can the Thomas & Betts B120R outlet box be installed in a finished wall without opening up the drywall?
That's exactly what the B120R is built for. It's an old work box, so it mounts into an existing finished wall through a cut opening rather than being nailed to a stud before the wall closes up. The images show nail-in mounting wings and mounting screws on the body. For renovation work in occupied offices, retail spaces, or multi-family units, that means adding an outlet or switch without opening the stud cavity and patching a long run of wall.
2) Is the B120R box UL listed for commercial and institutional work?
Yes, the B120R carries UL listing E11461. That's the file number an inspector or a spec writer can cross-reference, and it's what lets it go into commercial renovation, office, retail, and multi-family jobs where listed materials are required.
3) What is the difference between an old work box and a new work box, and which do I need?
It comes down to whether the wall is open. A new work box mounts to the face or side of a stud before drywall goes up, so it needs stud access. The B120R is an old work box: it goes in after the wall is finished, held by its own mounting hardware against the back of the wallboard rather than by a stud. Use new work when you're framing or the cavity is open, and the B120R when you're cutting into finished drywall to add a device.
4) Is the Thomas & Betts B120R nonmetallic, and does that mean I don't need to bond the box?
The B120R is PVC, so it's a nonmetallic box and there's nothing on the box itself to bond. The equipment grounding conductor in the cable lands on the device's green screw, and you carry the ground through to any other device in the box. That's the practical difference from a steel box, where the box itself has to be bonded.
5) Does the B120R come with a cover or a device plate, or do I order those separately?
The B120R ships as the box only, sold each. A receptacle or switch, the wall plate, and any cable connectors or straps you need are separate line items. Plan on adding the device and the plate to the same order so the opening gets finished in one trip.
6) How does cable get into the Thomas & Betts B120R old work box?
The box has built-in cable knockouts in the interior, visible on the side view of the B120R. On a retrofit you're fishing the cable down or across the cavity to the opening, bringing it in through the knockout, then setting the box and tightening the mounting hardware against the wallboard. Leave yourself enough free conductor at the opening to make up the device before you seat the box.
7) If I'm standardizing outlet boxes across a building for renovation work, is the B120R the right one to spec?
For retrofit openings in finished walls it's a sound standard: one model number, B120R, at 20 cubic inches in blue PVC, UL listed under E11461, sold each so you can buy to the actual device count on each floor. Where the walls come open, or you're building new partitions, you'd pair it with a new work box rather than use this one, since the B120R depends on a finished wall face to mount against.
8) Why is the B120R box blue, and does the color mean anything on the job?
Blue is how the trade flags a nonmetallic box on sight. The B120R is blue PVC, so a foreman or an inspector walking a rough-in can tell at a glance it isn't a steel box, which matters when the crew is mixing box types across a renovation. There's no performance difference tied to the color, it's identification.
9) What part number do I give my supplier for the Thomas & Betts blue old work outlet box?
B120R is the manufacturer part number, from Thomas & Betts. That's the full identity of the item: 20 cubic inch PVC old work outlet box, blue. There's no size or finish suffix to add.
How fast can I get the Thomas & Betts B120R 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 Thomas & Betts B120R come with a warranty?
Absolutely. The Thomas & Betts B120R 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 Thomas & Betts B120R?
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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