I am looking for an official interpretation regarding NFPA 13's FDC Pipe Sizing Guidelines. 220.127.116.11 gives contradictory and unclear guidance for this matter and I am in need of NFPA's interpretation and intent of the code.
- The way I read 2016 NFPA 13 18.104.22.168 is that the FDC pipe sizing must be in accordance with ONE of the following: which means that 4" piping will suffice regardless of the riser size, whether it be a 2" riser or an 8" in accordance to line #1. I read line #3 only as a means to achieve FDC piping smaller than 4". Please let me know your thoughts and interpretation.