Dave, generally Cat5 and automotive cable is insulated with PVC. PVC is flammable, burns readily creating copious amounts of thick, toxic smoke rendering it virtually impossible for pilots to see their flight instruments or BREATHE.
I would strongly suggest you use aircraft quality wire (Tefzel) or research other types carefully. Paul Smith Brisbane, AUSTRALIA pk.sm...@bigpond.net.au http://kr2spacemodulator.blogspot.com/ -----Original Message----- Dave_A said: Is there any issue with using Cat5 ethernet cable for making data (say, encoder -> transponder) and audio-panel hookups, and with, say, 18ga automotive wire for 14v power (to/from circuit breakers)?