Does anyone know of a code ruling that specifically allows or prevents FPL cable and THHN installed in the same conduit? Specifically in the following circumstance, I am using 18/2 FPLR twisted shielded cable for my addressable loop (SLC)which is power-limited, and #12 THHN conductors for my Audible/Visual devices (NAC)circuits which are also power-limited? I have researched and debated this topic with my co-workers and the code (NEC 760) seems vary vague on this subject and left up to interpretation, depending on which siden of the topic you are supporting. I would love to your opinions and Article #'s that support them. Thank you for your help on this!