At 09:49 PM 9/26/99 -0700, Dave Bell wrote:
>> For the record, knob and tube was considered obsolete before WWII.
>
>Perhaps, but my home, originally built circa 1952 (in California) was
>straight knob and tube. With much remodelling over the last 30 years, I
>have exactly one interior wall between two bedrooms, with a k&t run in it.
>The rubber insulated wires go straight up the wall into the attic, and
>into a steel junction box, where they are wire-nutted to Romex.
>
>Dave
>
Just picked up my copy of the National Electrical Code Handbook (1981 Ed)
which has (Article 324) the following:

324-1.  Definition.  Concealed knob-and-tube wiring is a wiring method using
knobs, tubes, and flexible nonmetallic tubing for the protection and support
of single insulated conductors concealed in hollow spaces of walls and
ceilings of buildings.

and

324-3.  Uses Permitted.  Concealed knob-and-tube wiring shall be permitted to
be used only for extensions of existing installations and elsewhere only by
special permission under the following conditions:

        (1) In the hollow spaces of walls and ceilings.
        (2) In unfinished attic and roof spaces as provided in Section 324-11.


I was not able to find any reference to WHEN knob-and-tube wiring became
"deprecated" (in modern jargon).