Best 4 Square Electrical Boxes for DIY Wiring Projects
Choosing the right 4 square electrical box ensures safer, neater wiring in walls or ceilings. The options below highlight durable, kit-friendly boxes with multiple knockouts, suitable for receptacles, switches, or fixtures. Each product features corrosion resistance, compliance with fire-rated wall standards, and easy installation. Review their specifications to match your project needs, from single-gang to multi-gang capacities and varied depths.
Summary of selected products
| Product | Brand | Depth | Knockouts | Key Benefit |
|---|---|---|---|---|
| RACO 232 4 in. Square Electrical Box | RACO | 2-1/8 in | ½ in. & ¾ in. side knockouts | Welded, fire-rated wall compatibility |
| Qlvily 8 Packs 4″ Square Electrical Box | Qlvily | 2-1/8 in | Ten ½ in., six ¾ in. | Galvanized, durable multi-box value |
| Hubbell-Raco 239 4 in. Square Plenum Box | RACO | 2-1/8 in | 11x ½ in., 5x ¾ in. | Drawn construction, high capacity |
| RACO 680 2-Device Square Switch Box | RACO | 2-1/8 in | ½ in. side knockouts | Two-gang suitability, easy to use |
| Qlvily 12 Pack 4″ Square Electrical Box | Qlvily | 1-1/2 in | Ten ½ in., six ¾ in. | 21.0 cu. in. capacity, galvanized |
Note: The following sections present detailed product information, helping you compare features like material quality, knockouts, and overall capacity for different installation scenarios.
RACO 232 4 In. Square Electrical Box
This 4-inch square box is welded for strong wall or ceiling installations and supports receptacles, switches, or fixtures. It offers combination screw heads for quick installs and is UL Listed for use in fire-rated walls up to two hours, making it suitable for demanding electrical layouts.
Qlvily 8 Packs 4″ Square Electrical Box
This galvanized metal box includes 4-inch square dimensions with a 2-1/8 inch depth and multiple knockouts for flexible conduit routing. The design emphasizes rust resistance and durability, making it a versatile choice for various electrical junctions and installations.
Hubbell-Raco 239 4 In. Square Plenum Box
Featuring drawn construction and UL Listing, this 4-inch square plenum box provides a substantial 30.3 cu. in. capacity. It accommodates a variety of wiring configurations while maintaining compliance with fire-rating standards and building codes.
RACO 680 2-Device Square Switch Box
This 4-inch square switch box is drawn and designed for 2-1/8 inch depth, with built-in compatibility for two devices. It emphasizes ease of use and practical installation, suitable for residential wiring where space efficiency matters. Manufactured to meet typical electrical standards.
Qlvily 12 Pack 4″ Square Electrical Box
This bulk set provides 4-inch square boxes with a 2-gang capacity implied by the 21.0 cubic inches total. It includes ten 1/2 inch and six 3/4 inch knockouts, offering flexible wiring options for multi-branch circuits or multi-gang installations.
(4 Pack) 4” Square Electrical Box by Airmont
This 4-pack features drawn construction with raised ground, 21.0 cu. in. capacity, and ten 1/2 inch plus six 3/4 inch knockouts. It is galvanized steel, designed for durability and fire-rated wall compatibility, and emphasizes quick, reliable installation.
Buying Guide
Key considerations when selecting a 4 square electrical box include material and finish, depth, knockout options, and capacity. Material matters: galvanized steel boxes resist rust and suit long-term installations, while drawn or welded constructions can influence box strength and ease of mounting. Depth compatibility with wall cavities is essential to avoid protrusion or wiring crowding. Knockouts determine conduit sizing and flexibility for future upgrades. Capacity, measured in cubic inches (cu. in.), affects how many wires and devices you can safely house. Fire-rating compatibility is important for walls that require 2-hour fire resistance. Finally, ensure the box is UL Listed and suited to your installation environment, whether residential, commercial, or plenums where applicable.
Comparison notes:
- Welded vs drawn construction can affect installation speed and durability in busy job sites.
- Boxes with more knockouts provide greater flexibility for future changes, but may require planning to avoid unused holes.
- Higher cu. in. capacity allows for more cables and devices, reducing crowding and heat buildup.
- Galvanized steel offers strong corrosion resistance, a benefit in damp or humid environments.
- Plenum-rated options are necessary when install spaces are used for air-handling purposes, to meet safety standards.