Used to remodel houses in Birmingham and ran into it fairly often. Knob & tube, cloth wrapped, and newer romex all in one house. Lead sealed up drain pipe joints on cast iron.
 
In the 1960's when I was doing electrical wiring in the evenings I ran 300 feet of wire from an old far house to a barn for a milker, the attic had single wires running to the different drops in the walls. I hooked into the main run from the service box. I tried to talk the guy into a new service entrance so I could run a barn circuit. No dice! It never burned down. the barn was taken down first and a few years later they bulldozed the house. It is all far land now.
 
The NEC will no longer allow knob and tube wiring in a house to be repaired or modified, it must be replaced. That change was 15 to 20 years ago. Prior to that it could be repaired or modified and the code covered it just like any other wiring method.
 
I rented an apartment with knob and tube. I lived in grandparents farm house for ten years after they passed that had had gas lights, pipes still there. The house had civil war era newspapers under the lathe.
 
I've never encountered 32 volts but I work on a house at least once a year that has knot and tube wiring. Then my parents house was wired with it. It was built before electricity was available. Each room had two wiring coming down the wall to a light switch.

In a lot of ways the knot and tube wiring seems safer. The hot and neutral are separated by about a foot. If a rodent chews the insulation off the wire it won't touch the other.
 
My house has the cement block in one Basement room the engine and generator was bolted to, batteries were in a wood rack on the wall I guess. I remeber playing with the black carbon cores of the batteries using them as a black chalk on the sidewalk.

Paul
 
My Dad's house still has some working knob and tube wiring. I work for an association where probably fifty of the houses were built around 1900 to 1925. Many of them have the push button switches.
 
My parents built a house in 1947 that was wired with Knob and tube, plug fuses and cartridge mains. Romex or bx was not legal until the '60's I believe. Had to be k&t or conduit. When Mother passed in 2015 sister and I sold the place for $1,350,000. Nothing said about wiring.
 
My great grandfather and his son (my grandfather) sold those in central KS and wired farm houses to work with those systems.


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