Been running into a lot of old wiring lately and thinking it'd be interesting to know how old a lot of this stuff is.

Wondering if anyone knows the time periods for when a lot of this stuff was used:
  • Knob & Tube: 1890-1930?
  • Whatever that stuff is that was pulled through abandon gas-lamp piping: ?
  • BX w/ cambric insulated conductors/no EGC: X-1940?
  • NM w/ fabric sheath and cambric insulated conductors/no EGC: ?
  • NM w/ fabric sheath and plastic/thermoplastic insulated conductors/undersized EGC: ?
  • Aluminum NM: 1965-1975?


Just guessing on the dates. Anyone know any answers or have any other wiring types?

-John