I have a question regarding 314.23 (B) (1)

[scootk70]

I have used those 1/4" holes on the back and the smaller 2 holes on the sides to mount 1900 boxes to everything from wooden framing members to steel trusses for 20+ years. All inspected all passed i would imagine one inspector even the great Osceolo county inspector Roy would have mentioned something if it were not right. I've used wood screws, tapcons, bolts, sheet metal screws, etc... i think iWire had it right. The only hole you cant use to mount with on the back of that box is the 8/32 threaded hole that is for the green ground screw.

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The threads for grounding are 10-32, just sayin' :angel:

 

[GerryB]

Side holes, not just for mounting.

I have used the side holes on occasion to mount to a stud and had trouble getting the plaster ring to fit nice. Also they are not as secure as the box with the bracket.