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 ...
Website Registration Required to Access this Content
Only registered users have access to Silver content.
Registration on EC&M allows you exclusive access to high value content centered around proprietary research, expert NEC analysis and in-depth technical procedures.