Type D precast concrete electrical box measuring 19 3/4 inches by 12 7/8 inches overall with a depth of 12 inches. The internal dimensions measure 18 3/8 inches by 11 1/2 inches at the top opening and taper down to 15 5/8 inches by 8 3/4 inches at the base. Section A-A and Section B-B detail the wall thickness, internal mounting inserts, and bracket clearances. A separate detail shows the concrete lid measuring 11 inches by 1 3/4 inches thick.
19 3/4" B A 12 7/8" A 11" 1 3/4" B LID 18 3/8" 17 1/8" 11 1/2" 10 1/4" 3" 12" 15 5/8" SECTION A-A 8 3/4" SECTION B-B
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