Top Rated Electrical Boxes for Pros and DIYers
For most professional jobs, the Raco 68855 Steel Square Box stands out as the top pick due to its rugged galvanized steel construction, generous 42 cubic inch capacity, and versatile mounting options, though its lack of pre-installed clamps may require extra effort.
Selecting the right electrical box is critical for safety, code compliance, and ease of installation. With numerous options on the market, professionals need boxes that offer durability, ample space, and flexibility.
We analyzed specifications and owner feedback for the most popular electrical boxes to identify those that meet the demands of professional use. From steel to PVC, find out which boxes deliver on performance.
The best picks, ranked
Raco 68855 Steel Square Box
This 4-inch square steel box is a workhorse for commercial and residential projects. Its deep 2-1/8 inch design provides generous space for wiring, and the knockout openings allow for flexible conduit entry.
Pros
- Extremely durable
- Large capacity
- Versatile knockout pattern
Cons
- No built-in cable clamps
- Heavy for some applications
Sigma Electric 1-Gang PVC New Work Box
This PVC box is lightweight and easy to install, with built-in nails for quick attachment to studs. It offers ample space for standard wiring and is resistant to corrosion.
Pros
- Lightweight
- Corrosion resistant
- Easy nail installation
Cons
- Not for conduit
- Less durable than steel
Southwire 52040121 2-Gang PVC Old Work Box
Designed for cut-in installations, this 2-gang PVC box features adjustable mounting tabs that secure firmly to drywall. It provides a clean, professional finish for switches and outlets.
Pros
- Easy retrofitting
- Secure tabs
- Dual gang capacity
Cons
- No built-in clamps
- Fragile if over-tightened
Orbit 58308 1-Gang Steel Old Work Box
This steel box is specifically designed for attachment to metal studs with its integrated clip. It is code compliant for use with metal framing and offers robust protection.
Pros
- Perfect for metal studs
- Durable steel
- No extra bracket needed
Cons
- Limited capacity
- Specific to metal studs
Bell 53155-1 Outdoor Weatherproof Box
This weatherproof box is made of die-cast aluminum and includes gaskets to protect against moisture. It is ideal for outdoor outlets, lighting, and fixtures.
Pros
- Weatherproof seal
- Rust resistant
- Suitable for wet locations
Cons
- Price higher than plastic
- Small capacity
Carlon B125R-U 1-Gang Old Work Box
With its shallow depth, this PVC box is perfect for tight spaces and retrofit work. It includes captive screws and mounting brackets for simple installation.
Pros
- Very shallow
- Easy to install
- Captive screws
Cons
- Limited wiring space
- Not for heavy cables
Thomas & Betts 4-Gang Steel Box
This 4-gang steel box offers expansive space for complex wiring systems. Its robust construction and multiple knockouts make it a favorite among electricians for commercial projects.
Pros
- Huge capacity
- Heavy duty
- Versatile
Cons
- Very heavy
- Large footprint
Side by side
| # | Model | Material | Best for | Score | Price |
|---|---|---|---|---|---|
| 1 | Raco 68855 Steel Square Box | Galvanized steel | Best for heavy-duty use and maximum capacity | 9.6 | Check price |
| 2 | Sigma Electric 1-Gang PVC New Work Box | PVC | Best for new construction and residential wiring | 9.2 | Check price |
| 3 | Southwire 52040121 2-Gang PVC Old Work Box | PVC | Best for retrofitting walls | 9.0 | Check price |
| 4 | Orbit 58308 1-Gang Steel Old Work Box | Galvanized steel | Best for metal stud applications | 8.9 | Check price |
| 5 | Bell 53155-1 Outdoor Weatherproof Box | Die-cast aluminum | Best for outdoor and wet locations | 9.4 | Check price |
| 6 | Carlon B125R-U 1-Gang Old Work Box | PVC | Best for shallow wall installations | 8.6 | Check price |
| 7 | Thomas & Betts 4-Gang Steel Box | Steel | Best for large commercial installations | 9.1 | Check price |
What matters most
Questions worth asking
What is the difference between new work and old work electrical boxes?
New work boxes are installed before drywall is put up, typically with nails or screws that attach to studs. Old work boxes are designed for retrofit installations, where drywall is already in place, and feature tabs or clamps that grip the drywall.
How do I determine the right size electrical box?
The box must have enough cubic inch capacity to accommodate all conductors, devices, and fittings without exceeding fill limits. Count the number of wires and devices, then use the National Electrical Code (NEC) box fill calculations to find the minimum capacity.
Can I use a plastic electrical box with metal conduit?
No, plastic boxes are not suitable for metal conduit systems because they do not provide the necessary grounding path. Metal boxes are required when using metal conduit to ensure proper grounding continuity.
Are electrical boxes rated for outdoor use?
Only boxes specifically marked as weatherproof or rated for wet locations should be used outdoors. These have gaskets and are made of corrosion-resistant materials like aluminum or fiberglass. Standard plastic or steel boxes are not appropriate for outdoor exposure.
What is a box fill calculation and why is it important?
Box fill calculation is a code requirement that limits the number of wires and devices in a box to prevent overcrowding, which can cause overheating and short circuits. It ensures safe installation and compliance with NEC.
Can I install an electrical box directly on drywall?
Yes, for old work installations, you can use cut-in boxes that have tabs or clamps to secure them to the drywall. However, for new work, boxes should be mounted to structural framing before the drywall is installed.
What are the benefits of using a steel electrical box?
Steel boxes are extremely durable, offer excellent grounding, and are suitable for conduit connections. They can handle high temperatures and are resistant to impact, making them ideal for commercial and industrial environments.
How do I secure cables entering an electrical box?
Cables must be secured to the box using approved clamps or connectors. Many boxes have built-in clamps, while others require separate fittings. Always ensure cables are tightly secured to prevent strain on connections.
Can I paint an electrical box?
Yes, you can paint metal or PVC boxes to match your decor. However, avoid painting the interior or the terminals. Ensure the paint is dry before installing devices. Use a primer for plastic to help adhesion.
What is the maximum number of wires allowed in a single gang box?
The maximum number depends on the cubic inch capacity of the box and the gauge of the wires. For example, a standard 18 cubic inch box can typically accommodate 8 to 10 14 AWG wires, but you must always perform a box fill calculation to be safe.
Final word
For most professional applications, the Raco 68855 Steel Square Box is the best overall choice due to its superior durability, large capacity, and versatility. However, if your project involves outdoor installation, the Bell 53155-1 is unmatched for weather resistance. Choose the box that matches your specific installation needs, but never compromise on safety and code compliance.
