Crew oxygen and electrical failure
 

Sorry guys, no big jets experience here, do you need electrics to use the crew oxygen? I mean, in case of total electrical failure, are you still able to use the oxygen masks or do you nead at least a battery source power to operate it?

No power source required (737 Classic)

I have been on many types and the answer I could give with confidence is no, it is an pneumatic mecanical device, the only thing electrical is indication and comm.