I'm doing a small fire alarm job, and the technician from Grinnell told me that the colour coding used does not matter, as long as the signal gets back to the panel. This doesn't sound right...I am using 5 conductor armoured FAS cable (LVT with red jacket) With the following colouring scheme inside it. red/black/blue/brown/green.

Obviously I have established that green is ground LOL But what colours constitute a pair? Is it Red/Black to device and Brown/Blue return to panel or EOL?

HELP lol
-Stefan.