CCTV using Baluns

[Jim <alarminex@xxxxxxx>]

I'm starting a CCTV job tomorrow in a small (30K sqft)warehouse using analo=
g cameras over cat5. Up till now I've used siamese coax and 12vdc. I typica=
lly do more residential work than commercial so I usualy don't have to worr=
y about voltage drop.=20

On this system I'm installing 10 inside cameras all with IR LED's. Each cam=
era draws 700ma with IR LED's on. I've got 5 cameras that will be in the re=
ar of the warehouse where there are no power outlets so the cameras will be=
 aprox 100 to 150 feet from the 24vac power source. I bought Balun's with s=
crew connections (rather than an RJ45 connector) for the Cat5 so that I cou=
ld use six of the conductors for the power, giving me aprox a 19 guage wire=
. I figure that should give me a voltage drop of about 2 volts which is les=
s than 10% of 24volts required by the cameras. I didn't do any research on =
what affect the distance of 150 feet over a 24 guage wire would have on the=
 video signal. I don't think it'll be a problem but I can always switch one=
 of the voltage wires over to the video terminals.=20

I'm just looking for some comments, suggestions and possible problems that =
I might not have thought of when using Baluns and Cat5 Any comments about l=
onger distances using Cat5 would be appreciated also. I've got a couple mor=
e larger warehouse jobs coming up so voltage drop is going to be a bigger i=
ssue