First, Section 5.2.3 does require PEX piping to be listed for fire protection applications. It states, “Types of pipe other than those specified in Table 5.2.2 shall be permitted to be used …show more content…
In addition, Table A.5.2.2(b) doesn’t negate the listing requirement either. Annex A.5.2.2 says that the information in Table A.5.2.2(a) through Table A.5.2.2(d) is provided to assist in the determination of acceptable water availability. This does not override the requirement of Section 5.2.2. The PEX piping used that meets UL 1821 is likely listed for fire protection. The issue is the description noted from UL that states, “This category covers cross-linked polyethylene (PEX) pipe and fittings intended for use in multipurpose piping systems of