The black inner wrap is plain old fashioned rubber, and is probably deteriorated, to the point of breaking into pieces. The outer wrap is cotton, not fireproofed. That wrap was popular in the 40s through the 60s or 70s. If you look in the crawl space, you will find knob and spool.
--- In DoIt_Yourself@yahoogroups.com, subprong <subprong@...> wrote:
>
> I replaced a light switch. Photo at the link
>
> http://groups.yahoo.com/group/DoIt_Yourself/photos/album/283632268/pic/1233258857/view
>
> The wiring is old. I believe there is black casing over the wiring and then
> wrapped in that cloth sheathing. Any idea what that cloth is? Is it
> fire retardant?
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