NM clamps for metal boxes

a single 14-2 and a device with clamps in the box would require a 12 cubic inch box. So that would be a 3 x 2 x 2 1/2 " making any box smaller than that useless unless 16 gauge Romex is a thing.

With no internal clamps and Romex connectors you can get away with 10 cubic inches a 3 x 2x2. The smallest device box you can go in and out of with 14-2 with a device in the box is 14 cubic inches again with no clamps a 3 x 2 x 2 3/4
 
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