Someone pointed out to me that our fire extinguisher that came with our brand new 2008 3400 Montana was only rated BC but has no A rating. I would strongly suggest that everyone check their fire extinguishers!
http://www.fire-extinguisher101.com/
Class C: Energized Electrical Equipment-wiring, fuse boxes, circuit breakers, machinery, and appliances. Class C does not include fires involving the 12-volt equipment found in all coaches. Once you deenergize or unhook from shore power and turn off your inverter or generator, a fire that occurs is a Class A fire rather than a Class C fire.
Jack