How should electrical boxes be installed in walls?

Electrical boxes should be installed flush with the wall surface to prevent obstruction. This is important for several reasons. Firstly, a flush installation allows for the proper fitting of wall plates, ensuring that they sit flat against the wall and maintain a clean, professional appearance. This can help prevent any potential hazards that might arise from loose or misaligned plates that could expose live terminals or create physical obstructions.

Furthermore, flush-mounted electrical boxes facilitate easier access for future electrical work, such as replacing or adding outlets and switches. They also comply with building codes and safety regulations, which often require that electrical boxes be properly aligned to avoid issues with safety inspections and to maintain standards in construction.

In contrast, alternative methods of installation, such as angling the boxes, recessing them, or allowing them to protrude from the wall, could lead to a range of problems, including aesthetics issues, accessibility challenges, and potential electrical hazards. Thus, installing electrical boxes flush with the wall surface is the recommended and safest practice.