Blacksheep - carbon is a bit of an odd element. It comes in several forms. Diamond is a lousy conductor. Graphite is a very good one.
Checkboard is correct - in some forms carbon is a very good conductor indeed, particularly when partially crystallised and including crystallised bits of copper from the wiring it once surrounded.
I like your extreme reluctance to reset CBs at all - however, there inevitably will be circumstances when it is essential to get the aircraft on the deck safely. However, as has been pointed out above, that CB should only be reset when the service is actually needed - not before, and preferably when only a couple of minutes away from the nice firefighters.