This box is a welded version of the drawn 4" square box you have there. It comes, from the factory, with ears for nailing it to a (wooden) stud, yet still has the exact same pattern of open holes in the back as yours does.
Source: Lowes.com
If this box comes with a UL listing (which it does) to be mounted via the attached mount points with the holes in the back open, then yours meets UL requirements when mounted through the side, even if the holes in the back are open.
Answer from FreeMan on Stack ExchangeDo surface mount electrical boxes have to be screwed into framing members? - DoItYourself.com Community Forums
Is it safe to use a metal box for a surface mounted electric range outlet?
Does a metal surface mount electrical box need to ... - Reddit
Do they make 2-gang versions of these surface mount switch boxes?
How do I choose the right size surface mount electrical box?
Choosing the right size surface mount electrical box depends on the devices and wiring you plan to install. Consider these points:
- Device Type: Larger boxes are needed for multiple outlets, switches, or complex wiring setups.
- Wire Capacity: Make sure the box can accommodate the number and gauge of wires safely.
- Space for Connections: Allow extra room for wire nuts and connectors to avoid overcrowding.
- Outdoor Use: For outdoor installations, select weatherproof boxes with appropriate IP ratings.
Review product dimensions and specifications to match your installation needs before purchasing.
Can surface mount electrical boxes be installed on any wall type?
Surface mount electrical boxes are versatile and can be installed on various wall types including drywall, concrete, brick, and wood. Here are some tips:
- Mounting Hardware: Use appropriate anchors or screws suited for the wall material to ensure a secure fit.
- Surface Preparation: Clean and level the installation area to help the box sit flush against the wall.
- Accessibility: Position the box where wiring can be easily routed and devices accessed.
Proper installation techniques help maintain safety and functionality regardless of wall type.
How can I protect outdoor electrical outlets with surface mount boxes?
Protecting outdoor electrical outlets is important for safety and durability. Surface mount weatherproof boxes are a great solution. Consider these tips:
- Choose Weatherproof Boxes: Look for boxes with an IP rating suitable for outdoor exposure to keep moisture out.
- Use Gasketed Covers: Covers with rubber gaskets provide a tight seal against rain and dust.
- Proper Sealing: Seal around cable entry points with silicone or appropriate sealants to prevent water intrusion.
- Regular Inspection: Periodically check the box and cover for damage or wear to maintain protection.
These steps help ensure your outdoor outlets stay safe and functional.
Videos
This box is a welded version of the drawn 4" square box you have there. It comes, from the factory, with ears for nailing it to a (wooden) stud, yet still has the exact same pattern of open holes in the back as yours does.
Source: Lowes.com
If this box comes with a UL listing (which it does) to be mounted via the attached mount points with the holes in the back open, then yours meets UL requirements when mounted through the side, even if the holes in the back are open.
You can just drill mounting holes as needed for a side mount. Do not drill on knockouts or contacting knockout edges. Being able to field-drill mounting holes is one of the many privileges of using a metal box! Can't do it with plastic.
The holes in the back of the box are not a code violation. It is normal for some of them to be unused. I keep a bag of #10-32 bolts and nuts in my electrical kit, I could always fill the holes with those if it bothered me. The smallest hole is already tapped #10-32.