Re: surface mounting in block walls
I always recommend using 1900 (4X4") boxes for exposed work.
Knock out the center knockout in the back of the box, drill a 1/4" hole in the wall and use a plastic anchor, fender washer and #10 sheetmetal screw to secure the box to the wall. This will allow you to plumb the box for a neat appearance. It is pretty difficult to drill holes right where you want them as the carbide drill usually kicks off your mark due to the irregular concrete surface.
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