Where knob-and-tube conductors pass through wood cross members in plastered partitions, conductors shall be protected by noncombustible, nonabsorbent, insulating tubes extending not less than _____ beyond the wood member. a) 2 in. b) 3 in. c) 4 in. d) 6 in. See answer and applicable Code reference The correct answer is: b) 3 in. Article 394 covers the use, installation, and construction specifications for concealed knob-and-tube wiring. As noted in 394.17, "Conductors shall comply ...

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