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

The maximum distance that the face of a device box can be set back from a gypsum wallboard surface is 6 mm (1/4"). This standard is in place to ensure that the device (such as an electrical outlet or switch) is sufficiently accessible. When devices are set too far back, it can lead to difficulties in connecting plugs or using the devices as intended. The 1/4" setback is a commonly accepted measurement that strikes a balance between aesthetic integration with the wall surface and practical usability. Following this guideline helps maintain consistency in installations and ensures compliance with electrical codes related to device accessibility and safety.