What is the maximum distance a device box can be set back from the finish surface made of gypsum wallboard?

The correct answer is that a device box can be set back a maximum of 6 mm (1/4") from the finish surface made of gypsum wallboard. This standard is established to ensure safety and usability. When the device box is too far recessed, it can hinder access to the electrical devices housed within, making it difficult to connect plugs or operate switches.

Additionally, maintaining this distance allows for proper installation practices, ensuring that there is enough room for the drywall to fit snugly against the box without compromising the integrity of the electrical system. By adhering to this maximum setback, electricians can ensure both compliance with electrical codes and ease of access for users. It's important to follow this guideline to promote safety and convenience in electrical installations.