When device boxes are installed in walls or ceilings with a combustible surface such as wood, the edge of the boxes must __________ the finished surface.
A) not be set back farther than 1/8 inch from
B) not be set back farther than 1/4 inch from
C) nor be set back farther than 1/2 inch from
D) be flush with

Question

Quizplus · Accepted Answer

When device boxes are installed in walls or ceilings with a combustible surface, they must be flush with the finished surface to prevent any gaps between the box and the combustible material, which could create a fire hazard. Therefore, option D is the correct choice.

When Device Boxes Are Installed in Walls or Ceilings with a Combustible