I'm using a 16 channel CD-Rw with Lan functions.

So if i run the coax and the 12vDC next to each other up the wall cavity to the cameras. I shouldn't have any problems, aslong as i keep at least a 30cm away from 240V AC power. Or do you reccomend run a conduit down the wall cavity as insulation?

No part of the cables will be exposed to weather conditions.

Brite Spark.

PS; Hope the install goes well. Let us no how is goes.