On Sun, 28 Jun 2015 21:01:51 -0700 (PDT), "
wrote:

With regard to interference into the TV line from the 60 Hz 120V line, yes, that can happen. The 12V circuit mentioned for lighting is, unfortunately, 12V, 60 Hertz so there is still potential for interference, but it should be only 10% of the possibility of interference using 120V.
The 12 volt circuit is GENERALLY AC but there is nothing saying it
cannot be DC, and 12 volt sis a lot less than 10% as likely to cause
interference.