I recently just purchased some cameras to monitor an area at my home that is 300ft away. The power requirements for each camera is 24vac 40VA (Nuvico CI-Z10-L & CI-Z30-L).  Here are my questions: 
  
What kind of power supply would I need to make a 300ft run and maintain the power requirements for the cameras?  Or would I have to run 110volts to the camera pole and mount an outdoor power supply on the pole? 
  
Since I have 3 cameras, can I pull, for the video, 1 cat5 cable, use baluns and 3 pairs of the cat5 to get the video signal? 
  
For the RS-485, will it transmit that far? 
  
Thanks in advance for all of your help!!!!!