audio and video cables over DC power 12V 3A

Hello,

I have three video cameras in the TV studio that are connected to the director with a coaxial video and XLR audio cable (the cables are next to each other). Can I add a DC 12V power cable with them without noise? The length of all cables is around 20m.

So I have same three group of cables (audio, video and DC power cable). Can run it together about 20m ?

I now, balanced cables is less sensitive to noise, but what about if run over DC power cable?

Other cables in studio are mostly sepeareted.

 

As long as it is a high quality supply, and the DC-powered devices aren't going to cause current transients (such as being powered on and off while in use) adjacent DC should be fine. If you are concerned, consider the +48v phantom power that runs on the same cable conductors as microphone signals.