602.2.1.2 Fire sprinkler piping.
MC § 602.2.1.2
Plastic fire sprinkler piping exposed within a plenum shall be used only in wet pipe systems and shall have a peak optical density of 0.50 or less, an average optical density of 0.15 or less, and a flame spread of 5 feet (1524 mm) or less when tested in accordance with UL 1887. Piping shall be listed and labeled.











