RACO 878 4-11/16 in. Square Ex...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$10.71
RACO 878 4-11/16 in. Square Exposed Work Cover, 30-50A Receptacle Opening

RACO 878 4-11/16 in. Square Exposed Work Cover, 30-50A Receptacle Opening

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Model: 878

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

$10.71
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RACO 878 4-11/16 in. Square Exposed Work Cover, 30-50A Receptacle Opening

The RACO 878 is a 4-11/16 in. square exposed work cover designed for surface-mounted electrical box installations. Featuring a round receptacle opening with a 2.141 in. dia. cutout, this cover accommodates 30-50A receptacle devices in commercial and industrial applications. Designed for use with exposed work boxes, the RACO 878 provides a clean, code-compliant finish for surface conduit runs in commercial and industrial settings. Built to meet cULus Listed standards, the RACO 878 delivers a code-compliant, precision-fit solution for exposed conduit and box systems.

Key Features

  • Trade Size: 4-11/16 in. square cover sized for standard exposed work electrical boxes.
  • Receptacle Opening: 2.141 in. dia. round cutout engineered to accept 30-50A receptacle devices.
  • Configuration: Round receptacle opening centered on a square cover plate for a clean, functional installation.
  • Shape: Square cover profile matches 4-11/16 in. square exposed work boxes for a secure, flush fit.
  • Amperage Compatibility: Sized to support 30-50A receptacle installations in exposed wiring applications.
  • Listing: cULus Listed for verified safety and code compliance.
  • Installation-Ready Design: Square profile and centered receptacle opening simplify alignment during exposed work installations.
  • Device Compatibility: Round opening accommodates 30-50A receptacle devices commonly used in heavy-duty electrical circuits.

Certifications & Compliance

  • cULus Listed

Technical Specifications

  • Product Type: Cover
  • Product Size: 4-11/16 in
  • Product Shape: Square
  • Configuration: Round Receptacle
  • Certified Listed: cULus Listed

Typical Applications

  • Exposed Work Electrical Box Installations
  • Commercial and Industrial Wiring Systems
  • 30-50A Receptacle Mounting Applications
  • Surface-Mounted Conduit and Box Systems
  • Renovation and New Construction Electrical Work

Why RACO?

RACO engineers exposed work covers to precise dimensional standards, ensuring the RACO 878 delivers a reliable, flush-fitting solution for 4-11/16 in. square box installations. As part of RACO's line of exposed work box covers, the 878 is manufactured to consistent dimensional tolerances, helping ensure a proper fit against 4-11/16 in. square boxes on every installation. Backed by cULus Listing, its 2.141 in. dia. round receptacle opening supports code-compliant 30-50A receptacle installations for demanding commercial and industrial electrical projects.

Manufacturer Resources

Spec Sheet

Product Specs

list_batch:
RACO-20260916
Product Type:
Raised Device Cover
Product Size:
4-11/16 in
Product Shape:
Square
Configuration:
Round Receptacle
Certified Listed:
cULus Listed
Department:
Electrical
Product Subgroup:
Box Covers
Product Group:
Boxes & Enclosures

RACO 878 – Frequently Asked Questions

1) Will the RACO 878 cover fit a 4-11/16 in. square exposed work box?
Yes. The RACO 878 is a 4-11/16 in. square cover made to match the footprint of 4-11/16 in. square exposed work boxes (commonly called 5-square boxes in the trade). It is a surface-mount, exposed work cover, not a flat blank or a raised device ring for a flush wall box.
2) What size receptacle opening does the RACO 878 have, and what receptacles does it take?
One round cutout, 2.141 in. diameter, centered on the plate. That opening is sized for 30-50A receptacle devices, the kind used on dryer, range, welder and equipment circuits. It is a single-opening cover, so one large device per box.
3) Can I use the RACO 878 cover for a standard duplex or decorator receptacle?
No. The 878 has a single 2.141 in. round opening for 30-50A power receptacles. A 15A or 20A duplex, a decorator/GFCI device, or a toggle switch needs a different exposed work cover with the matching device cutout. Ordering the 878 for a duplex leaves you with a hole that will not accept the device.
4) Is the RACO 878 exposed work cover listed for commercial and industrial installations?
It is cULus Listed, which covers both US and Canadian requirements for the cover itself. It is intended for surface-mounted box and exposed conduit work in commercial and industrial settings, including new construction and renovation.
5) Do I get the receptacle or mounting screws with the RACO 878 cover?
The 878 is the cover plate only. The 30-50A receptacle device and the box are separate purchases. Plan the order around the device amperage and NEMA configuration you need, then use the 878 to close out the box.
6) Can the RACO 878 be used on a flush-mounted wall box behind drywall?
It is built for exposed work, meaning surface-mounted boxes on walls, ceilings and columns fed by surface conduit. For a box recessed in a finished wall you want a flush device cover or plaster ring plus a wall plate instead, not an exposed work cover.
7) What is the RACO part number for the 4-11/16 in. square 30-50A receptacle cover?
RACO 878. That is the manufacturer part number to specify or cross-reference when matching a 4-11/16 in. square exposed work box with a 2.141 in. round receptacle opening.
How fast can I get the RACO 878 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 RACO 878 come with a warranty?
Absolutely. The RACO 878 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 RACO 878?
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 RACO 878 from ZenSupply?
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