A:Answer It's a shame the company didn't answer you. Unfortunately, I can't figure out any in-wall installation info. On the manufacturer's website, it says this cable is TIA/EIA and UL Certified (which, as per UL's website, is the equivalent of both "Listed" and "Classified" as of 2013). And both on the website and in supplied info above, unfortunately it's stranded copper rather than solid. Better than CCA but not the best out there. Too bad, cuz otherwise these seem like they'd be perfect for my own purposes.