discoduncan 0 Posted January 27, 2012 Hi to all the contributers on the forum. I am based in the uk. I am thinking about buying a ptz dome camera the specs are on my sky drive follow the link below. https://skydrive.live.com/redir.aspx?cid=348b1014ca4f6157&resid=348B1014CA4F6157!148&parid=348B1014CA4F6157!113&authkey=!AD8ka_pEMz_oaPI I hope to run Cat5e directly from the dvr to the dome, use one twisted pair with a passive balun for the video, then another twisted pair for the RS485. I would like to use the remaining two twisted pairs for the power. I used the following calculator http://www.netkrom.com/voltage_loss_over_cat5_calculator.php?re2=cal&item=resources and input the details as follows Input voltage 24 Input Current 0.37a (24a/65w) Cable length 15m (50ft) Cable Pairs 2 Wire Guage 24 Results Voltage Drop 0.1 Required Supply 24.1 Effective Guage 21 Cable Resistance 0.6 Power dissipation 0 Does this look as though it will work ok? Any improvements or errors ar anything at all really will be listened to, thought about, responded to and acted upon? Cheers Guys Share this post Link to post Share on other sites
SectorSecurity 0 Posted January 27, 2012 If the calculator is correct I do not see a problem, host cameras requiring 24V can stand a small voltage drop and still function. Share this post Link to post Share on other sites
Soundy 1 Posted January 27, 2012 ^Agreed, you should be fine with that. Share this post Link to post Share on other sites
discoduncan 0 Posted January 28, 2012 Thank you Soundy & Sector Security Share this post Link to post Share on other sites
