I am using these cables to control intelligent lighting systems and would like to know how many feet of cord you have to go through and carry the signal before you start to experience any kind of signal fading or loss. I am using 3 pin XLR cables. I am controlling two ACCU spot 250's and a Pilot 150 Intelligent light.
In general, you would want to use a single cable for the entire run if possible. Every time you add an additional cable, you are lowering the reliability of the system (but not by too much if they are good quality cables). Lighting control signals are very forgiving and you should be able to run that signal for several hundred feet over XLR cables with no problems. Like I said though, you should eventually replace the multiple cables with one long cable for better reliability when you can afford it.