Wiring methods have changed over the years from knob and tube to flexible armored cable (Greenfield) to nonmetallic cable (NM), conduit (EMT), and underground feeder (UF) cable. From about 1890 to the present, wiring methods have become much safer due to the installation types of wiring and the addition of ground wires.
Believe it or not, the wiring in your home can give away its age. If you've noticed in the past few years, NM cable has changed color from all white sheathed to colors like yellow an orange sheathed. Much like color coded individual wires, the color signifies the wire size inside.
So does your home have knob and tube, NM cable, maybe it's piped? Read on to learn about your wiring's age.
...Source: http://electrical.about.com/b/2013/01/02/how-old-is-your-wiring.htm
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