(1) Except as provided in Sentence (2), this Section applies to plumbing facilities and plumbing systems serving dwelling units.
(2) Plumbing facilities, grab bars, floor drains and floor and wall finishes around urinals shall conform to Subsection 3.7.4. and Article 7.1.5.2. in,
(a) a recreational camp,
(b) a camp for housing of workers, or
(c) all other buildings not described in Sentence (1).
(3) Medical gas piping systems shall conform to Subsection 3.7.5.