CCTV cameras: coax and 24vac together?

[davej1324]

I've got CCTV cameras anywhere from 200' to 1000' apart. the conduit is run underground. Is it OK to run the 24vac power with the coax for these distances? also what is the best type of wire for the 24v power? solid? stranded?, a jacketed pair? OR could I run just a pair of #14 THHN stranded wires?

 

[daronwilson]

I would certainly be using solid copper RG6 for over 500 feet or so, RG11 over 1200 feet or so, and more likely be considering fiber for the video for those distances.

If I were going to provide remote power, I would probably use tray cable. It is available in 18 gage and larger, it is designed for direct burial and also has an overall shield. You may want to upsize the wire from what is originally recommended to compensate for the voltage drop for those longer distances. Although I don't see any technical reason you couldnt use solid conductor, it would likely be easier to handle the stranded wire in conduit.

There should be no problem running the two in the same conduit.

Good Luck! It is only my opinion, based on my experience and education...I am always willing to learn, educate me!
Daron J. Wilson, RCDD
daron.wilson@lhmorris.com

 

[franklin97355]

http://www.nitek.net/TR515-560 spec 052301.pdf

http://www.london-cctv.co.uk/coaxial-cable.html

Two ideas I found on the web.

 

[DTSMAN]

The supply houses sell a wire that has the power cables molded to the coax as all one piece. I get mine from adi.
Part # wg-50135008

 

[butthead]

< Wire and Cable calculations >

Calculate Wire size

Voltage is -> 24volts
Amp load is -> .2amps
Length of cable is -> 1000ft
Voltage drop is -> 1.2volts (5%)
Calculated size of cable in circular mils is -> 3724

Suggested cable or wire size is -> 14 awg (4110 circular mil)
____________________________________________

tomcruz.net
electrician forman

 

[franklin97355]

Butthead, where were you when this question was being discussed? (two years ago)