On September 15, 2009 at 23:26, CCD said...
I wish I could but I will have to leave that to your AHJ and the NFPA 70. I can tell you that residential installs rarely require plenum as someone posted. We run a ton in commercial and MDUs but almost never in a single family home.
i never use plenum rated cable in single family residential installs, afaik it's not required unless run in an air handling space, and that only happens in commercial installations, to my knowledge.
i was instructed by a builder superintendant to use plenum rated cable in a commercial installation once, even though the space inside the drop ceiling was not a plenum. he specifically told me that the drop ceiling was not even necessary for the HVAC, but he wanted plenum rated cable installed anyway. i followed his instructions, only to see CAT5 CL2 run all through the same drop ceiling.
