How may luminaries be mounted to an outlet fastened to an offset bar hanger?

• A. Only with a fixture stud
• B. Either a fixture stud or No. 8-32 screw holes in the box
• C. Only with No. 6-32 screws
• D. With any compatible screw holes

Answer: (B)

Luminaries that attach to an outlet box on an offset bar hanger can be mounted using either of the two common mounting interfaces the box provides. You can use a fixture mounting stud that projects from the strap and accepts the luminaire, or you can use screws that thread into the box’s own mounting holes. This dual option covers most fixtures and mounting styles, which is why the best answer is that you may use either method. The other options are too restrictive or imprecise: limiting mounting to a single method or to a specific screw size doesn’t fit the variety of fixtures, and claiming you can use “any compatible screw holes” can lead to using locations not intended for mounting.