Question

nccer 26111 - residential wiring 46min
which of the following is true of an outlet box when a combustible wall finish is used?
○ may be recessed 1/4\
○ may be raised by 1/2\
○ may be recessed 5/8\
○ must be flush with the wall

Explanation:

In electrical wiring, when a combustible wall finish is used, outlet boxes must be flush with the wall to prevent fire hazards (recessing or raising could create gaps that might ignite the combustible material). The other options (recessed 1/4", raised 1/2", recessed 5/8") do not comply with safety standards for combustible wall finishes.

Answer:

D. must be flush with the wall