If you live in an older home (and there are many of them in St. Louis) it might have knob and tube wiring. Knob and tube (or K&T) was the standard method of electrical wiring when electricity was first used in homes in the 1880s. New innovations in cable and wire came along in the 1920s, but K&T was still common up until the 1950s when more modern methods took over.

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