Whether you’re wiring a new fixture, routing cables in a dense wall, or replacing aging enclosures, a 1-1/2 inch deep junction box offers ample space and solid protection. The models below focus on 4×4 or square configurations with 1-1/2″ depths and a robust set of knockouts to accommodate various conduit and cable sizes. Each option below emphasizes durability, fire-rated compatibility, and clear interior access for safe splices and device mounting. This guide highlights five well-rounded choices to help electricians and DIYers select boxes that fit their project needs and space constraints.
| Product | Depth | Capacity (Cu. In.) | Knockouts | Drill/Fire Rated |
|---|---|---|---|---|
| NIDAYE Galvanized 4″ Square Drawn Electrical Box | 1-1/2″ | 21.0 | Ten 1/2″, Six 3/4″ | 2-hour rated wall |
| Venussar 4″ Square Electrical Box | 1-1/2″ | 21.0 | Ten 1/2″, Six 3/4″ | Fire-rated wall acceptable |
| Copkim 4 x 4 Deep Square Box | 1-1/2″ | 21.0 | 11 x 1/2″, 6 x 3/4″ | 2-hour fire rated wall |
| OHLECTRIC 4×4 Electrical Junction Boxes | 1-1/2″ | 21.0 | 10 x 1/2″ | UL listed, bulk pack |
| Copkim 4-Pack 4×2 Boxes Set | 1-1/2″ | 21.0 per box | 10 x 1/2″, 0.0 others noted | Industrial grade galvanized steel |
NIDAYE Galvanized 4″ Square Drawn Electrical Box
The NIDAYE 4″ square junction box combines a durable 1/16″ thick galvanized steel construction with a 21.0 cubic inch capacity. It features ten 1/2″ knockouts and six 3/4″ knockouts, plus several side and bottom knockouts for flexible installation in a fire-rated wall. The raised ground design provides enhanced grounding reliability, while the 1-1/2″ depth adds space for multiple conductors, splices, and devices. This unit is suitable for 2-hour fire-rated walls, making it a robust choice for residential and commercial interiors where fire safety is a priority. The trade size is 2-gang, though its compact footprint helps it fit into tighter wall cavities with ease.
Venussar 4″ Square Electrical Box With Cover
The Venussar option mirrors the NIDAYE in size and capacity, offering a 4×4 square footprint with 1-1/2″ depth and a 21.0 cubic inch interior. It includes ten 1/2″ and six 3/4″ knockouts for flexible routing of wires and conduits. The box is constructed from galvanized steel to endure common installation conditions and is suited for use within a 2-hour fire-rated wall. The included cover helps keep connections secure and protected from dust and moisture during service. This model emphasizes straightforward installation and clean finishes in visible and hidden junctions alike.
Copkim 4 x 4 Deep Square Box Set
This Copkim package includes eight 4x4x1-1/2 inch square boxes with a total interior capacity of 21.0 cubic inches per box. The kit highlights galvanized steel construction for durability and includes 11 pieces of 1/2″ knockouts and 6 pieces of 3/4″ knockouts, enabling flexible conduit and cable layouts. The design supports a tidy, organized wiring system and is compatible with 2-hour fire-rated walls. This option is ideal for projects requiring multiple boxes with consistent sizing and knockout availability for complex installations.
OHLECTRIC 4×4 Electrical Junction Boxes
OHLECTRIC offers bulk 10-pack boxes, each 4×4 inches with a 1-1/2 inch depth and a 21 cubic inch interior. The boxes are manufactured from drawn steel for sturdy protection of wires, connectors, and devices. Each unit includes blank covers for a clean, enclosed finish, helping maintain organized wiring runs and reducing the risk of interference or damage to internal components. The package is well-suited for larger projects or ongoing electrical work where multiple enclosures are required in close proximity.
Copkim 8 Pcs Metal Deep Square Boxes Set
Copkim’s 8-pack deep square boxes provide 15.5 cubic inches per box, a compact yet useful alternative for smaller wiring projects or light-duty installations. The set emphasizes galvanized steel construction for long-term durability and resistance to corrosion. It includes four 1/2″ and four 3/4″ knockouts in practical configurations to support clean wire routing and reliable splicing within 1-1/2″ depth boxes. The design prioritizes ease of installation and secure wiring layouts, especially in dense wall cavities or retrofit situations.
Buying Guide: Key Purchase Considerations And Comparisons
- Depth and capacity: A 1-1/2″ depth provides space for multiple conductors and splices. Verify that the available interior volume accommodates the anticipated wires, connectors, and devices without crowding.
- Knockout configurations: Look for a mix of 1/2″ and 3/4″ knockouts to support standard conduits and larger cables. Removable knockouts can speed up rough-in and layout planning.
- Material and finish: Galvanized steel boxes offer durability and corrosion resistance, making them suitable for various environments, including damp or industrial settings.
- Fire-rated compatibility: For walls requiring fire resistance, confirm the box is rated or approved for use in 2-hour or other fire-rated assemblies as required by local codes.
- Cover inclusion: Some boxes come with matching blank covers, which help protect internal components and provide a neat finished appearance after installation.
- Quantity and project scope: If you’re equipping multiple locations or doing a large retrofit, choose multi-pack options that provide consistent sizing and knockout counts to streamline installation and inventory management.
- Code compliance: Ensure the selected boxes meet applicable electrical codes and standards in the United States (e.g., UL-listed where applicable) to support safe and compliant installations.
- Installation environment: Consider whether you need additional features such as raised grounding, or built-in supports for devices like receptacles and switches, based on your specific wiring plan.
In summary, the chosen 1-1/2 inch deep junction boxes offer a balance of space, durability, and flexible knockout layouts suitable for modern electrical work. Depending on project size, you may prioritize a bulk set for consistency, or select individual boxes with specific knockout configurations to match conduit types and routing strategies. Always plan for extra capacity to simplify future expansions and maintenance tasks.