ECN Forum Forums Code Related Discussion NEC & other Code issues 314.23(B)(1) Box Supports.

Although I've never called this, I think my reading the literal text of the code, using the holes in the back of a four sqaure box would be a violation as written. I don't think this is the intent and that is why I've never written it, but that is the way the literal text reads. In my opinion, if the nail or screw penetrates the box within a 1/4" of the back or end(s) of the box, I see no problem. I think when the screws penetrate the side of the box in the center of the box it is a problem.