Carlon Round Old Work Box 18 C...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$83.46
$6.59
Thomas & Betts B618RR 3/0 - 4/0 OLD WORK BOX

Carlon Round Old Work Box 18 Cubic Inch Polycarbonate Swing Clamps

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Model: B618RR
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$83.46
$6.59
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Thomas & Betts Round Old Work Box 18 Cubic Inch Polycarbonate Swing Clamps

Professional Electrical Box for Retrofit Installation Applications

The Thomas & Betts Round Old Work Box delivers reliable electrical box performance for retrofit and renovation electrical installations. This polycarbonate round old work box provides dependable performance designed for electrical contractors, industrial facilities, and commercial installations, offering the trusted performance and quality that professionals expect from America's established electrical infrastructure manufacturer.

Professional Features & Benefits

Construction Performance

  • Polycarbonate Construction - Durable thermoplastic material provides excellent impact resistance and dimensional stability for long-term electrical box performance
  • 18 Cubic Inch Volume - Generous interior space accommodates multiple wire connections and electrical devices with proper fill capacity
  • Round Configuration - Traditional round design fits standard electrical rough-in applications and provides versatile mounting options
  • Old Work Design - Specifically engineered for retrofit installations in existing walls without requiring access from behind

Installation System

  • Swing Clamp Mounting - Professional swing clamp system provides secure attachment to drywall and wall materials without additional hardware
  • Retrofit Application - Designed for old work installations where wall access is limited, enabling efficient electrical upgrades
  • Professional Installation - Thomas & Betts engineering ensures reliable mounting and electrical code compliance for contractor applications

Technical Specifications

Product Type: Round Old Work Box, Material: Polycarbonate, Volume: 18 Cubic Inches, Mounting Type: Swing Clamps, Department: Electrical, Product Group: Electrical Boxes, Product Subgroup: Electrical Boxes, Color: Blue

Installation & Usage

  1. Mark and cut appropriate round opening in wall material using proper cutting tools
  2. Insert electrical box through opening ensuring swing clamps are in retracted position
  3. Position box flush with wall surface and activate swing clamp mechanism
  4. Verify secure mounting by gently testing box stability in wall opening
  5. Install electrical wiring according to local electrical codes and NEC requirements
  6. Complete electrical device installation and verify proper grounding connections

Professional Applications

Ideal for:

  • Retrofit Electrical Work - Renovation projects requiring electrical box installation in existing walls without rear access
  • Commercial Renovations - Office buildings, retail spaces, and commercial facilities requiring electrical system upgrades
  • Residential Remodeling - Home improvement projects adding new electrical outlets, switches, or lighting fixtures
  • Industrial Facility Updates - Manufacturing and warehouse facilities upgrading electrical infrastructure in existing structures
  • Electrical Contractor Applications - Professional electrical installations requiring reliable old work box solutions
  • Maintenance and Repair - Facility maintenance applications replacing damaged or outdated electrical boxes
  • Code Compliance Upgrades - Electrical system improvements meeting current electrical code requirements
  • Drywall Installation - New electrical box installation in finished wall surfaces with swing clamp mounting

Polycarbonate Construction Advantage

Thomas & Betts selection of polycarbonate material provides superior impact resistance, dimensional stability, and long-term durability compared to standard thermoplastic electrical boxes. The polycarbonate construction maintains structural integrity under temperature variations and provides excellent electrical insulation properties for safe electrical installations.

Why Choose Thomas & Betts Quality?

Thomas & Betts brings decades of established experience in electrical infrastructure solutions, maintaining unwavering commitment to professional quality standards and trusted reliability for electrical contractors and facility managers. Our electrical boxes are engineered to meet rigorous electrical code requirements while providing the dependable performance that electrical professionals demand for critical infrastructure applications.

Manufacturer Resources

Product Specs

Idea Granular Category Code Igcc :
4433 >> Outlet box
Product Group:
Electrical Boxes
Product Type:
Round Old Work Box
Selling Unit Of Measure:
each
Volume:
18 in³
Department:
Electrical
Product Subgroup:
Electrical Boxes
Product Color:
Blue
Installation Category:
Swing Clamps
Product Material:
Polycarbonate

Carlon B618RR – Frequently Asked Questions

1) Can the Thomas & Betts B618RR round box be installed in an existing finished wall without opening it up?
That is exactly what an old work box is for. The B618RR mounts with swing clamps that pivot out behind the wall material and pull the box tight against the back face of the drywall, so all the work happens from the room side. Cut the round opening, feed the cable in, drop the box through with the clamps retracted, then tighten to draw the clamps up. No stud, no bracket, and no access from behind the wall.
2) How many wires can I put in an 18 cubic inch round old work box?
Volume is 18 cubic inches, and NEC box fill is what governs the count from there. Each 14 AWG conductor counts 2.00 cubic inches and each 12 AWG counts 2.25, with one extra conductor volume for all grounds combined, one for all cable clamps in the box, and two for a device yoke. On the 18 cubic inch B618RR that works out to nine 14 AWG or eight 12 AWG conductor allowances before deductions, so a typical lighting outlet with two cables and a fixture ground is comfortable.
3) Is the B618RR strong enough to hang a ceiling light fixture from?
Treat it as a wiring outlet box, not a fixture support box. Nothing in the B618RR record rates it for luminaire or paddle fan support, and swing clamps grip the drywall face rather than framing. For a fixture you want a box specifically marked as fixture rated or a fan/fixture brace bar anchored to structure. The B618RR is right for splices, receptacles and switches in a retrofit opening.
4) Can I use the B618RR to replace an old metal round box in a plaster wall?
It works if you can get the old box out and the finish material will hold a clamp. Swing clamps bear on the back of the wall surface, so they want sound drywall or firm plaster with a clean round cut. Crumbly plaster or lath that breaks out around the hole will not hold the clamps, and there you are better off with a box anchored to framing. Where the surface is solid, the polycarbonate B618RR drops in from the room side and gives you 18 cubic inches to work with.
5) Polycarbonate vs standard PVC old work box, does the material matter for a cold or rough job?
It matters mostly at installation. Polycarbonate takes impact and stays dimensionally stable better than commodity thermoplastic, which is the difference between a box that survives a cold basement retrofit and one that cracks at the clamp ear when you torque it. The B618RR is molded polycarbonate. It is still an interior outlet box, so a wet or damp location needs a listed weatherproof enclosure instead.
6) Will an 18 cubic inch round old work box fit a standard 4 inch round ceiling or wall opening?
The B618RR is a round old work box sized for standard round rough-in openings, so it drops into a hole cut with a common round box hole saw. Before you cut, check the depth behind the finish surface: swing clamps need clearance to rotate out behind the drywall, so insulation packed tight or a plate right behind the opening will fight you. Dry fit the box in the hole before pulling cable.
7) Do I need any screws, brackets or mud rings to install the B618RR, or is everything in the box?
The mounting is self-contained. Swing clamps are part of the box and grab the wall material directly, so there is no bracket, nail-on ear or anchor to buy. You supply the cable connector or clamp appropriate to your wiring method and the device screws come with the device. It is sold each, so order one per opening.
8) I need to order the Thomas & Betts old work box for a retrofit, what is the part number?
Order it as Thomas & Betts B618RR. That is the round old work box, blue polycarbonate, 18 cubic inch, with swing clamp mounting, and it is the single model offered under that description. Priced and sold as each.
9) Why is the Thomas & Betts B618RR blue instead of gray, and does the color mean anything?
Blue is the standard trade color for non-metallic residential and light commercial outlet boxes, and the B618RR follows it. The color is identification only, not a rating. What decides its use is the polycarbonate body and the 18 cubic inch volume, not the shade.
How fast can I get the Carlon B618RR 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 Carlon B618RR come with a warranty?
Absolutely. The Carlon B618RR 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 Carlon B618RR?
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
Why buy the Carlon B618RR from ZenSupply?
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