【How-to】What size is 2x3 lumber

Most wall framing is done with 2×4 or 2×6 lumber but it may be possible to use 2×3’s to build a new, non-load-bearing, interior wall. By code, 2×3’s may be used for this purpose if the wall is no taller than 10 feet and the studs are spaced every 16 inches. … In addition, electrical boxes won’t fit in a 2×3 wall.